{"id":1302,"date":"2026-07-13T06:11:25","date_gmt":"2026-07-13T06:11:25","guid":{"rendered":"https:\/\/lift-cylinders.com\/?p=1302"},"modified":"2026-07-13T06:11:25","modified_gmt":"2026-07-13T06:11:25","slug":"dock-leveller-hydraulic-lift-cylinders","status":"publish","type":"post","link":"https:\/\/lift-cylinders.com\/id\/application\/dock-leveller-hydraulic-lift-cylinders\/","title":{"rendered":"Silinder Pengangkat Hidraulik Penyeimbang Dermaga"},"content":{"rendered":"<div style=\"margin: 0; padding: 0; font-family: 'Helvetica Neue',Helvetica,Arial,sans-serif; color: #1a2332; line-height: 1.78; background: #f0f3f7; overflow-x: hidden;\">\n<header style=\"position: relative; min-height: min(600px,88vh); display: flex; align-items: flex-end; width: 100%; background: #06100e; background-image: linear-gradient(155deg,rgba(4,12,10,0.97) 0%,rgba(8,24,20,0.92) 50%,rgba(14,66,50,0.58) 100%),url('https:\/\/lift-cylinders.com\/wp-content\/uploads\/2025\/10\/istockphoto-2175812080-612x612-1.jpg'); background-size: cover; background-position: center 40%;\">\n<div style=\"position: absolute; top: 0; left: 0; right: 0; height: 5px; background: linear-gradient(90deg,#d97706,#f59e0b,#d97706);\"><\/div>\n<div style=\"position: absolute; bottom: -1px; left: 0; right: 0; height: 56px; background: #f0f3f7; clip-path: polygon(0 100%,100% 100%,100% 0);\"><\/div>\n<div style=\"position: relative; z-index: 2; width: 100%; padding: clamp(48px,7vw,96px) clamp(20px,5vw,60px) clamp(52px,6vw,84px); box-sizing: border-box;\">\n<div style=\"display: inline-flex; align-items: center; gap: 8px; margin-bottom: 20px;\">\n<div style=\"width: 28px; height: 3px; background: #d97706;\"><\/div>\n<p><span style=\"font-size: 10px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #f59e0b;\">APPLICATION GUIDE \u00b7 DOCK &amp; LOGISTICS \u00b7 HYDRAULIC LIFT CYLINDERS<\/span><\/p>\n<div style=\"width: 28px; height: 3px; background: #d97706;\"><\/div>\n<\/div>\n<h1 style=\"font-size: clamp(26px,4.6vw,46px); font-weight: 900; color: #fff; line-height: 1.1; margin: 0 0 20px; letter-spacing: -0.8px; max-width: 720px;\">Dock Leveller<br \/>\nSilinder Angkat Hidraulik<br \/>\n<span style=\"color: #f59e0b;\">Platform \u00b7 Lip \u00b7 Ramp<\/span><\/h1>\n<p style=\"font-size: clamp(14px,1.9vw,17px); color: #94a3b8; line-height: 1.7; margin: 0 0 30px; max-width: 620px;\">The hydraulic dock leveller is one of the most heavily cycled pieces of fixed industrial equipment in any distribution centre or logistics facility \u2014 a high-throughput warehouse dock can complete 80\u2013120 truck loading cycles per day, with the platform lift cylinder operating at each cycle. Despite this intensity, the dock leveller lift cylinder is often the most neglected hydraulic component in a building, maintained only when it fails rather than on a structured preventive schedule. This guide covers specification, load calculations, corrosion protection, and the maintenance programme that keeps dock leveller lift cylinders in service for 10\u201315 year intervals between rebuilds.<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 6px;\"><span style=\"background: rgba(217,119,6,0.15); border: 1px solid rgba(217,119,6,0.45); color: #fbbf24; font-size: 11px; font-weight: bold; padding: 4px 12px; border-radius: 2px; letter-spacing: 1px; text-transform: uppercase;\">Platform Lift<\/span><br \/>\n<span style=\"background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.15); color: #94a3b8; font-size: 11px; font-weight: bold; padding: 4px 12px; border-radius: 2px; letter-spacing: 1px; text-transform: uppercase;\">Lip Extension<\/span><br \/>\n<span style=\"background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.15); color: #94a3b8; font-size: 11px; font-weight: bold; padding: 4px 12px; border-radius: 2px; letter-spacing: 1px; text-transform: uppercase;\">Load-Hold Safety<\/span><\/div>\n<p style=\"font-size: 11px; color: #475569; margin: 22px 0 0; letter-spacing: 1px;\">LIFT CYLINDERS \u00b7 DOCK LEVELLER APPLICATION \u00b7 JULY 2026<\/p>\n<\/div>\n<\/header>\n<p>&nbsp;<\/p>\n<div style=\"background: #0f1e35; border: 1px solid #1e3a5f; border-left: 4px solid #d97706; border-radius: 4px; padding: 24px 28px; margin: 52px 0 0;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #d97706; margin: 0 0 16px;\">REFERENCE \u00b7 DOCK LEVELLER LIFT CYLINDER PARAMETERS<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(min(100%,170px),1fr)); gap: 1px; background: #1e3a5f;\">\n<div style=\"background: #0f1e35; padding: 16px 18px;\">\n<p style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #475569; margin: 0 0 6px;\">PLATFORM BORE<\/p>\n<p style=\"font-size: 22px; font-weight: 900; color: #f59e0b; margin: 0 0 4px;\">80\u2013160 mm<\/p>\n<p style=\"font-size: 12px; color: #64748b; margin: 0;\">Single-acting plunger or double-acting; capacity 6\u201312 t platform + load rated<\/p>\n<\/div>\n<div style=\"background: #0f1e35; padding: 16px 18px;\">\n<p style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #475569; margin: 0 0 6px;\">DAILY CYCLES<\/p>\n<p style=\"font-size: 22px; font-weight: 900; color: #f59e0b; margin: 0 0 4px;\">40\u2013120<\/p>\n<p style=\"font-size: 12px; color: #64748b; margin: 0;\">High-throughput distribution docks \u2014 lift cylinder accumulates 15 000\u201340 000 cycles per year<\/p>\n<\/div>\n<div style=\"background: #0f1e35; padding: 16px 18px;\">\n<p style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #475569; margin: 0 0 6px;\">TEKANAN SISTEM<\/p>\n<p style=\"font-size: 22px; font-weight: 900; color: #f59e0b; margin: 0 0 4px;\">16\u201320 MPa<\/p>\n<p style=\"font-size: 12px; color: #64748b; margin: 0;\">Dock levellers typically use compact HPU units at 16\u201320 MPa with single-acting platform cylinders<\/p>\n<\/div>\n<div style=\"background: #0f1e35; padding: 16px 18px;\">\n<p style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #475569; margin: 0 0 6px;\">LOAD HOLD<\/p>\n<p style=\"font-size: 22px; font-weight: 900; color: #f59e0b; margin: 0 0 4px;\">Full shift<\/p>\n<p style=\"font-size: 12px; color: #64748b; margin: 0;\">Platform must hold rated load for the full truck loading period \u2014 typically 15\u201345 minutes per cycle<\/p>\n<\/div>\n<\/div>\n<\/div>\n<nav style=\"margin: 28px 0 0; background: #fff; border: 1px solid #cbd5e0; border-radius: 4px; padding: 22px 26px; position: relative; overflow: hidden;\">\n<div style=\"position: absolute; inset: 0; background-image: linear-gradient(rgba(30,58,95,0.03) 1px,transparent 1px),linear-gradient(90deg,rgba(30,58,95,0.03) 1px,transparent 1px); background-size: 24px 24px; pointer-events: none;\"><\/div>\n<div style=\"position: relative;\">\n<div style=\"display: flex; align-items: center; gap: 8px; margin-bottom: 14px;\">\n<div style=\"width: 3px; height: 14px; background: #d97706; border-radius: 2px;\"><\/div>\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 2.5px; text-transform: uppercase; color: #1e3a5f; margin: 0;\">INDEKS DOKUMEN<\/p>\n<\/div>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(min(100%,270px),1fr)); gap: 2px 24px;\"><a style=\"color: #1e3a5f; text-decoration: none; font-size: 13.5px; padding: 4px 0; display: flex; align-items: baseline; border-bottom: 1px solid #f1f5f9;\" href=\"#s1\"><span style=\"color: #d97706; font-size: 10px; font-weight: 800; margin-right: 8px; flex-shrink: 0;\">01<\/span>Dock Leveller Types and Hydraulic Cylinder Positions<\/a><br \/>\n<a style=\"color: #1e3a5f; text-decoration: none; font-size: 13.5px; padding: 4px 0; display: flex; align-items: baseline; border-bottom: 1px solid #f1f5f9;\" href=\"#s2\"><span style=\"color: #d97706; font-size: 10px; font-weight: 800; margin-right: 8px; flex-shrink: 0;\">02<\/span>Platform Lift Cylinder \u2014 Force and Stroke Sizing<\/a><br \/>\n<a style=\"color: #1e3a5f; text-decoration: none; font-size: 13.5px; padding: 4px 0; display: flex; align-items: baseline; border-bottom: 1px solid #f1f5f9;\" href=\"#s3\"><span style=\"color: #d97706; font-size: 10px; font-weight: 800; margin-right: 8px; flex-shrink: 0;\">03<\/span>Lip Extension Cylinder \u2014 Angle and Speed Requirements<\/a><br \/>\n<a style=\"color: #1e3a5f; text-decoration: none; font-size: 13.5px; padding: 4px 0; display: flex; align-items: baseline; border-bottom: 1px solid #f1f5f9;\" href=\"#s4\"><span style=\"color: #d97706; font-size: 10px; font-weight: 800; margin-right: 8px; flex-shrink: 0;\">04<\/span>Load-Holding Safety and Fail-Safe Requirements<\/a><br \/>\n<a style=\"color: #1e3a5f; text-decoration: none; font-size: 13.5px; padding: 4px 0; display: flex; align-items: baseline; border-bottom: 1px solid #f1f5f9;\" href=\"#s5\"><span style=\"color: #d97706; font-size: 10px; font-weight: 800; margin-right: 8px; flex-shrink: 0;\">05<\/span>Corrosion Protection for Dock Environments<\/a><br \/>\n<a style=\"color: #1e3a5f; text-decoration: none; font-size: 13.5px; padding: 4px 0; display: flex; align-items: baseline; border-bottom: 1px solid #f1f5f9;\" href=\"#s6\"><span style=\"color: #d97706; font-size: 10px; font-weight: 800; margin-right: 8px; flex-shrink: 0;\">06<\/span>Maintenance Schedule for Dock Leveller Cylinders<\/a><br \/>\n<a style=\"color: #1e3a5f; text-decoration: none; font-size: 13.5px; padding: 4px 0; display: flex; align-items: baseline;\" href=\"#faq\"><span style=\"color: #d97706; font-size: 10px; font-weight: 800; margin-right: 8px; flex-shrink: 0;\">Pertanyaan yang Sering Diajukan (FAQ)<\/span>Dock Leveller Cylinder Questions<\/a><\/div>\n<\/div>\n<\/nav>\n<p><!-- S1 --><\/p>\n<section id=\"s1\" style=\"margin: 64px 0 0;\">\n<div style=\"display: flex; align-items: stretch; gap: 0; margin-bottom: 22px;\">\n<div style=\"width: 4px; background: linear-gradient(180deg,#d97706,#f59e0b); border-radius: 2px; flex-shrink: 0;\"><\/div>\n<div style=\"padding: 10px 16px; background: #fff; border: 1px solid #e2e8f0; border-left: none; flex: 1;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #d97706; margin: 0 0 3px;\">BAGIAN 01<\/p>\n<h2 style=\"font-size: clamp(17px,2.4vw,22px); font-weight: 800; color: #0f1e35; margin: 0; line-height: 1.2;\">Dock Leveller Types and Hydraulic Cylinder Positions<\/h2>\n<\/div>\n<\/div>\n<figure style=\"margin: 0 0 24px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 100%; min-width: 100%; height: auto; border-radius: 3px; display: block; border: 1px solid #cbd5e0;\" title=\"Dock Leveller Lift Cylinder \u2014 Platform and Lip Cylinder Positions\" src=\"https:\/\/lift-cylinders.com\/wp-content\/uploads\/2025\/10\/main-and-auxiliary-lifting-cylinders-3.webp\" alt=\"Hydraulic lift cylinder for dock leveller platform lift lip extension logistics warehouse loading dock\" \/><figcaption style=\"font-size: 12px; color: #64748b; margin-top: 8px; padding-left: 10px; border-left: 2px solid #d97706;\">Dock leveller hydraulic cylinder positions \u2014 a hydraulic dock leveller contains two or three lift cylinder positions depending on design type: the main platform lift cylinder that raises the leveller platform to truck bed height, the lip extension cylinder that deploys the front lip onto the truck floor, and in some designs a leveller deck tilt cylinder for grade compensation. Each position operates under different load, speed, and safety requirements.<\/figcaption><\/figure>\n<p style=\"font-size: 16px; margin-bottom: 16px;\">Hydraulic dock levellers use two or three cylinder positions depending on the design configuration. Understanding which position each cylinder serves is the starting point for correct replacement specification:<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 8px; margin: 0 0 22px;\">\n<div style=\"display: flex; gap: 0; border: 1px solid #e2e8f0; border-radius: 4px; overflow: hidden;\">\n<div style=\"background: #d97706; min-width: 110px; display: flex; align-items: center; justify-content: center; padding: 0 14px; flex-shrink: 0;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; text-align: center; margin: 0; text-transform: uppercase;\">PLATFORM<br \/>\nLIFT<\/p>\n<\/div>\n<div style=\"padding: 13px 18px; background: #fff; flex: 1;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">The main lift cylinder raises the entire leveller deck from its stored (flush with dock floor) position upward, typically 300\u2013450 mm above dock floor level, to allow height adjustment to match the truck bed. Single-acting plunger or double-acting depending on the leveller design \u2014 single-acting models lower under the deck&#8217;s own weight (gravity return); double-acting models use hydraulic pressure for controlled lowering. Bore: 80\u2013160 mm. The platform lift cylinder is the structural heart of the dock leveller hydraulic system and must hold the combined weight of the platform and any forklift truck on it for the duration of loading.<\/p>\n<\/div>\n<\/div>\n<div style=\"display: flex; gap: 0; border: 1px solid #e2e8f0; border-radius: 4px; overflow: hidden;\">\n<div style=\"background: #1e3a5f; min-width: 110px; display: flex; align-items: center; justify-content: center; padding: 0 14px; flex-shrink: 0;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; text-align: center; margin: 0; text-transform: uppercase;\">LIP<br \/>\nEXTENSION<\/p>\n<\/div>\n<div style=\"padding: 13px 18px; background: #f8fafc; flex: 1;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">A smaller double-acting or spring-extended cylinder that pivots the front lip of the leveller platform outward and downward to rest on the truck floor, bridging the gap between the dock and the truck. Bore: 40\u201380 mm. Stroke: 100\u2013250 mm depending on lip arc. The lip extension lift cylinder must deploy the lip against its own weight at any platform height within the leveller&#8217;s adjustment range, which means it must generate sufficient torque to rotate the lip through its full angular arc even at the minimum and maximum platform height positions.<\/p>\n<\/div>\n<\/div>\n<div style=\"display: flex; gap: 0; border: 1px solid #e2e8f0; border-radius: 4px; overflow: hidden;\">\n<div style=\"background: #059669; min-width: 110px; display: flex; align-items: center; justify-content: center; padding: 0 14px; flex-shrink: 0;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; text-align: center; margin: 0; text-transform: uppercase;\">VEHICLE<br \/>\nRAMP<\/p>\n<\/div>\n<div style=\"padding: 13px 18px; background: #fff; flex: 1;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">On edge-of-dock levellers, a vehicle ramp cylinder lowers a short ramp section to the truck floor independently of the main platform. Also found on yard ramps and mobile dock ramp equipment. Typically single-acting with spring return, bore 50\u2013100 mm. On vehicle restraint docks, this cylinder position also controls the truck wheel chock engagement \u2014 a safety-critical function requiring counterbalance valve load-holding when the restraint is engaged.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<p><!-- S2 --><\/p>\n<section id=\"s2\" style=\"margin: 56px 0 0;\">\n<div style=\"display: flex; align-items: stretch; gap: 0; margin-bottom: 22px;\">\n<div style=\"width: 4px; background: linear-gradient(180deg,#d97706,#f59e0b); border-radius: 2px; flex-shrink: 0;\"><\/div>\n<div style=\"padding: 10px 16px; background: #fff; border: 1px solid #e2e8f0; border-left: none; flex: 1;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #d97706; margin: 0 0 3px;\">BAGIAN 02<\/p>\n<h2 style=\"font-size: clamp(17px,2.4vw,22px); font-weight: 800; color: #0f1e35; margin: 0; line-height: 1.2;\">Platform Lift Cylinder \u2014 Force and Stroke Sizing<\/h2>\n<\/div>\n<\/div>\n<p style=\"font-size: 16px; margin-bottom: 16px;\">The platform lift cylinder must raise the dock leveller deck against three simultaneous loads: the dead weight of the steel deck structure, any static load on the deck at the moment of lift initiation, and the geometric force required by the pivot arrangement of the platform. Because the platform pivots on a rear hinge rather than lifting vertically, the lift cylinder \u2014 which is typically mounted below the platform at an angle \u2014 must generate more force than the simple vertical load would suggest:<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(min(100%,260px),1fr)); gap: 14px; margin: 0 0 22px;\">\n<div style=\"background: #0f1e35; border-radius: 4px; padding: 18px 20px; border-top: 3px solid #d97706;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 2.5px; text-transform: uppercase; color: #d97706; margin: 0 0 12px;\">TYPICAL SIZING PARAMETERS \u2014 6 t RATED DOCK LEVELLER<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 7px;\">\n<div style=\"display: flex; justify-content: space-between; border-bottom: 1px solid #1e3a5f; padding-bottom: 5px;\"><span style=\"font-size: 13px; color: #94a3b8;\">Platform dead weight<\/span><span style=\"font-size: 13px; color: #f59e0b; font-weight: bold;\">1 200 kg<\/span><\/div>\n<div style=\"display: flex; justify-content: space-between; border-bottom: 1px solid #1e3a5f; padding-bottom: 5px;\"><span style=\"font-size: 13px; color: #94a3b8;\">Rated load (empty pallet truck)<\/span><span style=\"font-size: 13px; color: #f59e0b; font-weight: bold;\">1 500 kg<\/span><\/div>\n<div style=\"display: flex; justify-content: space-between; border-bottom: 1px solid #1e3a5f; padding-bottom: 5px;\"><span style=\"font-size: 13px; color: #94a3b8;\">Geometry factor at lowest position<\/span><span style=\"font-size: 13px; color: #f59e0b; font-weight: bold;\">1.8\u00d7<\/span><\/div>\n<div style=\"display: flex; justify-content: space-between; border-bottom: 1px solid #1e3a5f; padding-bottom: 5px;\"><span style=\"font-size: 13px; color: #94a3b8;\">Design force required<\/span><span style=\"font-size: 13px; color: #f59e0b; font-weight: bold;\">47.7 kN<\/span><\/div>\n<div style=\"display: flex; justify-content: space-between; border-bottom: 1px solid #1e3a5f; padding-bottom: 5px;\"><span style=\"font-size: 13px; color: #94a3b8;\">Safety factor applied (1.5\u00d7)<\/span><span style=\"font-size: 13px; color: #f59e0b; font-weight: bold;\">71.6 kN<\/span><\/div>\n<div style=\"display: flex; justify-content: space-between;\"><span style=\"font-size: 13px; color: #94a3b8;\">Selected bore @ 18 MPa<\/span><span style=\"font-size: 14px; color: #34d399; font-weight: 800;\">\u00d8 80 mm (90.5 kN)<\/span><\/div>\n<\/div>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #e2e8f0; border-radius: 4px; padding: 16px 18px;\">\n<p style=\"font-size: 11px; font-weight: 800; color: #1e3a5f; letter-spacing: 1.5px; text-transform: uppercase; margin: 0 0 10px;\">STROKE DETERMINATION<\/p>\n<p style=\"font-size: 14px; color: #374151; margin: 0 0 10px; line-height: 1.65;\">The stroke of the dock leveller platform lift cylinder is determined by the total height adjustment range of the leveller \u2014 typically \u00b1300 mm from dock floor level (300 mm above for high trucks, 300 mm below for low trucks). However, because the cylinder is mounted at an angle under the platform, the cylinder stroke is longer than the vertical travel \u2014 typically 1.3\u20131.8\u00d7 the vertical travel, depending on the cylinder mounting angle and the arm length to the rear hinge.<\/p>\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">For a 600 mm total height adjustment range with a cylinder mounting angle of 35\u00b0 from horizontal and a 900 mm arm moment: required stroke \u2248 600 \/ sin(35\u00b0) = 600 \/ 0.574 \u2248 1 045 mm. Select the next standard stroke above this value \u2014 in this case 1 100 mm.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<p><!-- S3 --><\/p>\n<section id=\"s3\" style=\"margin: 56px 0 0;\">\n<div style=\"display: flex; align-items: stretch; gap: 0; margin-bottom: 22px;\">\n<div style=\"width: 4px; background: linear-gradient(180deg,#d97706,#f59e0b); border-radius: 2px; flex-shrink: 0;\"><\/div>\n<div style=\"padding: 10px 16px; background: #fff; border: 1px solid #e2e8f0; border-left: none; flex: 1;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #d97706; margin: 0 0 3px;\">BAGIAN 03<\/p>\n<h2 style=\"font-size: clamp(17px,2.4vw,22px); font-weight: 800; color: #0f1e35; margin: 0; line-height: 1.2;\">Lip Extension Cylinder \u2014 Angle and Speed Requirements<\/h2>\n<\/div>\n<\/div>\n<figure style=\"margin: 0 0 24px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 100%; min-width: 100%; height: auto; border-radius: 3px; display: block; border: 1px solid #cbd5e0;\" title=\"Dock Leveller Lip Cylinder \u2014 Pressure and Speed Verification\" src=\"https:\/\/lift-cylinders.com\/wp-content\/uploads\/2025\/10\/test-equipment.webp-2.webp\" alt=\"Dock leveller lip extension hydraulic lift cylinder pressure test and speed verification commissioning\" \/><figcaption style=\"font-size: 12px; color: #64748b; margin-top: 8px; padding-left: 10px; border-left: 2px solid #d97706;\">Lip extension cylinder pressure and speed test \u2014 the lip must extend fully and contact the truck floor within the time window that the truck has presented itself at the dock, typically 5\u201310 seconds from operator command to lip contact. A slowing lip extension speed indicates reduced pump flow capacity (common as dock leveller HPU units age) or a lip cylinder with increased internal friction from seal wear or contamination.<\/figcaption><\/figure>\n<p style=\"font-size: 16px; margin-bottom: 16px;\">The lip extension lift cylinder rotates the front lip through approximately 90\u2013110\u00b0 from its stored (folded-under) position to its extended (resting on truck floor) position. The force required varies significantly through this arc \u2014 maximum force is required at the start of extension when the lip is horizontal and its full weight acts as a moment against the cylinder, and minimum force is needed at full extension when gravity assists the final lowering:<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 6px; margin: 0 0 22px;\">\n<div style=\"display: flex; gap: 12px; align-items: flex-start; padding: 11px 16px; background: #fff; border: 1px solid #e2e8f0; border-radius: 4px;\">\n<p><span style=\"background: #d97706; color: #fff; font-size: 10px; font-weight: bold; padding: 2px 10px; border-radius: 2px; flex-shrink: 0; margin-top: 2px;\">FORCE PROFILE<\/span><\/p>\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">At initial extension (0\u201320\u00b0 lip angle from stored position): the full weight of the lip acts against the cylinder through the worst-case moment arm. For a 250 kg lip section with a 600 mm moment arm to the pivot: torque = 250 \u00d7 9.81 \u00d7 0.6 = 1 473 Nm. At a cylinder mounting radius of 200 mm, the required cylinder force = 1 473 \/ 0.2 = 7 365 N. A 50 mm bore lift cylinder at 16 MPa delivers 31.4 kN \u2014 adequate with substantial margin. Size for the initial extension force, not the mean-stroke force.<\/p>\n<\/div>\n<div style=\"display: flex; gap: 12px; align-items: flex-start; padding: 11px 16px; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 4px;\">\n<p><span style=\"background: #1e3a5f; color: #fff; font-size: 10px; font-weight: bold; padding: 2px 10px; border-radius: 2px; flex-shrink: 0; margin-top: 2px;\">EXTENSION SPEED<\/span><\/p>\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">Lip extension speed must be controlled to prevent the lip dropping onto the truck floor at high velocity \u2014 impact at the truck floor can damage the truck bed, injure feet, and stress the lip hinge. A flow control valve in the lip extension supply limits maximum extension speed to approximately 30\u201360\u00b0\/second of lip arc. The lift cylinder must complete the full extension in 3\u20136 seconds from operator command, which requires a minimum flow rate determined by the bore area and stroke length to be covered per second.<\/p>\n<\/div>\n<div style=\"display: flex; gap: 12px; align-items: flex-start; padding: 11px 16px; background: #fff; border: 1px solid #e2e8f0; border-radius: 4px;\">\n<p><span style=\"background: #059669; color: #fff; font-size: 10px; font-weight: bold; padding: 2px 10px; border-radius: 2px; flex-shrink: 0; margin-top: 2px;\">LIP RETRACTION<\/span><\/p>\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">On double-acting lip cylinders, retraction raises the lip back to the stored position before the platform can lower to floor level \u2014 the control circuit must sequence platform lowering after lip retraction is confirmed. On spring-return lip designs, the spring provides the retraction force; verify that the spring rate is matched to the cylinder&#8217;s retraction-stroke back-pressure to prevent the spring from fighting the cylinder during the lowering phase.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<p><!-- S4 --><\/p>\n<section id=\"s4\" style=\"margin: 56px 0 0;\">\n<div style=\"display: flex; align-items: stretch; gap: 0; margin-bottom: 22px;\">\n<div style=\"width: 4px; background: linear-gradient(180deg,#d97706,#f59e0b); border-radius: 2px; flex-shrink: 0;\"><\/div>\n<div style=\"padding: 10px 16px; background: #fff; border: 1px solid #e2e8f0; border-left: none; flex: 1;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #d97706; margin: 0 0 3px;\">BAGIAN 04<\/p>\n<h2 style=\"font-size: clamp(17px,2.4vw,22px); font-weight: 800; color: #0f1e35; margin: 0; line-height: 1.2;\">Load-Holding Safety and Fail-Safe Requirements<\/h2>\n<\/div>\n<\/div>\n<p style=\"font-size: 16px; margin-bottom: 16px;\">The dock leveller platform lift cylinder must hold the platform \u2014 with a loaded forklift truck on it \u2014 at the set height for the duration of the truck loading operation. If the platform descends during loading, the gap between the platform lip and the truck floor can trap a pallet edge or forklift wheel, causing a tip-over incident. The load-holding requirements for dock leveller lift cylinders are therefore safety-critical:<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(min(100%,260px),1fr)); gap: 12px; margin: 0 0 22px;\">\n<div style=\"background: #fff; border: 1px solid #e2e8f0; border-radius: 4px; padding: 15px 17px; border-top: 3px solid #dc2626;\">\n<p style=\"font-size: 11px; font-weight: 800; color: #dc2626; letter-spacing: 1.5px; text-transform: uppercase; margin: 0 0 8px;\">PILOT-OPERATED CHECK<\/p>\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.6;\">Every dock leveller platform lift cylinder must have a pilot-operated check valve (POCV) mounted directly at the cylinder cap-end port. The POCV blocks oil from leaving the cylinder unless a deliberate lowering signal is applied. With the POCV in place, pump failure, hose rupture, or control valve failure cannot cause the platform to descend \u2014 the load is held indefinitely by the trapped oil column. Maximum permitted drift rate under rated load: 5 mm per 10 minutes according to EN 1570 (lifting tables) requirements applicable to dock levellers.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #e2e8f0; border-radius: 4px; padding: 15px 17px; border-top: 3px solid #d97706;\">\n<p style=\"font-size: 11px; font-weight: 800; color: #d97706; letter-spacing: 1.5px; text-transform: uppercase; margin: 0 0 8px;\">PRESSURE DROP ALARM<\/p>\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.6;\">Modern dock management systems monitor the platform lift cylinder pressure continuously during loading. A pressure drop below a set threshold \u2014 indicating platform descent or hydraulic circuit failure \u2014 triggers an alarm and automatically activates the vehicle restraint system to lock the truck in position. This dual-safety architecture (POCV plus pressure monitoring) is increasingly specified for dock levellers in facilities processing hazardous goods or operating with high forklift traffic density.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #e2e8f0; border-radius: 4px; padding: 15px 17px; border-top: 3px solid #1e3a5f;\">\n<p style=\"font-size: 11px; font-weight: 800; color: #1e3a5f; letter-spacing: 1.5px; text-transform: uppercase; margin: 0 0 8px;\">MECHANICAL SAFETY LEG<\/p>\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.6;\">High-safety dock installations add a mechanical safety leg \u2014 a positive mechanical stop that engages automatically when the platform is raised to the working position and prevents descent even if all hydraulic containment fails. The lift cylinder lowers onto the safety leg before loading commences; the leg is retracted hydraulically before the platform can be lowered at end of loading. The safety leg provides protection independent of the lift cylinder&#8217;s hydraulic integrity.<\/p>\n<\/div>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #e2e8f0; border-left: 4px solid #d97706; padding: 14px 20px; border-radius: 0 4px 4px 0;\">\n<p style=\"font-size: 13.5px; color: #374151; margin: 0; line-height: 1.7;\">Dock leveller lift cylinders in facilities subject to the EU Machinery Directive (2006\/42\/EC) must have documented evidence of the load-holding valve specification, test pressure, and drift rate \u2014 the POCV function must be verified at commissioning and at each annual inspection. For industrial-grade dock leveller lift cylinders with integrated POCV port options, the <a style=\"color: #1e3a5f; font-weight: 600; text-decoration: none;\" href=\"https:\/\/hydrauliccylindersprice.com\/product-category\/industrial-engineering-hydraulic-cylinders\/\" target=\"_blank\" rel=\"noopener\">silinder hidrolik teknik industri<\/a> range provides configurations with the applicable valve integration and documentation packages.<\/p>\n<\/div>\n<\/section>\n<p><!-- S5 --><\/p>\n<section id=\"s5\" style=\"margin: 56px 0 0;\">\n<div style=\"display: flex; align-items: stretch; gap: 0; margin-bottom: 22px;\">\n<div style=\"width: 4px; background: linear-gradient(180deg,#d97706,#f59e0b); border-radius: 2px; flex-shrink: 0;\"><\/div>\n<div style=\"padding: 10px 16px; background: #fff; border: 1px solid #e2e8f0; border-left: none; flex: 1;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #d97706; margin: 0 0 3px;\">BAGIAN 05<\/p>\n<h2 style=\"font-size: clamp(17px,2.4vw,22px); font-weight: 800; color: #0f1e35; margin: 0; line-height: 1.2;\">Corrosion Protection for Dock Environments<\/h2>\n<\/div>\n<\/div>\n<figure style=\"margin: 0 0 24px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 100%; min-width: 100%; height: auto; border-radius: 3px; display: block; border: 1px solid #cbd5e0;\" title=\"Dock Leveller Lift Cylinder \u2014 Corrosion Protection Specification\" src=\"https:\/\/lift-cylinders.com\/wp-content\/uploads\/2025\/10\/lift-cylinder-home-factory-1.jpg\" alt=\"Dock leveller hydraulic lift cylinder corrosion resistant specification for outdoor dock pit environment\" \/><figcaption style=\"font-size: 12px; color: #64748b; margin-top: 8px; padding-left: 10px; border-left: 2px solid #d97706;\">Dock leveller lift cylinder corrosion protection \u2014 the dock pit environment combines road salt ingress from truck tyres in winter, rain water pooling in the pit below the platform, and cleaning chemical washdown from dock hygiene programmes. A lift cylinder installed in a dock pit without a corrosion protection specification upgrade will typically rust through the outer coating and begin external cylinder surface degradation within 2\u20133 years.<\/figcaption><\/figure>\n<figure style=\"margin: 0 0 24px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 100%; min-width: 100%; height: auto; border-radius: 3px; display: block; border: 1px solid #cbd5e0;\" title=\"Dock Leveller Lift Cylinder Replacement Range \u2014 Platform and Lip\" src=\"https:\/\/lift-cylinders.com\/wp-content\/uploads\/2025\/10\/main-and-auxiliary-lifting-cylinders-3.webp\" alt=\"Dock leveller hydraulic lift cylinder range platform and lip replacement cylinder stock\" \/><figcaption style=\"font-size: 12px; color: #64748b; margin: 8px 0 0; padding-left: 10px; border-left: 2px solid #d97706;\">Dock leveller lift cylinder product range \u2014 platform lift cylinders and lip extension cylinders are available in all standard bore sizes from 40 mm through 160 mm, with corrosion-resistant outer coatings, stainless steel rod options, and cold-store-rated seal grades for facilities operating at sub-zero temperatures.<\/figcaption><\/figure>\n<p style=\"font-size: 16px; margin-bottom: 16px;\">The dock pit \u2014 the recessed area below the leveller platform \u2014 is one of the most corrosive environments for a fixed installation hydraulic cylinder. Road salt deposited by truck tyres, pooled rainwater from dock ingress, and cleaning chemicals from dock hygiene programmes all act on the lift cylinder&#8217;s outer surfaces and exposed rod. Corrosion protection must be specified as a deliberate engineering decision, not as an afterthought:<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 8px; margin: 0 0 22px;\">\n<div style=\"display: flex; gap: 0; border: 1px solid #e2e8f0; border-radius: 4px; overflow: hidden;\">\n<div style=\"background: #d97706; min-width: 110px; display: flex; align-items: center; justify-content: center; padding: 0 12px; flex-shrink: 0;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; text-align: center; margin: 0; text-transform: uppercase;\">OUTER BODY<br \/>\nCOATING<\/p>\n<\/div>\n<div style=\"padding: 13px 18px; background: #fff; flex: 1;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">The cylinder barrel and end-caps must be coated with a corrosion-resistant system rated to a minimum of 480 hours salt spray (ISO 9227) \u2014 at least twice the standard 200-hour industrial coating specification. A zinc-epoxy primer plus two-coat high-build polyurethane topcoat at a minimum total dry-film thickness of 200 \u03bcm achieves this requirement. The coating must extend over all weld seams and transition zones between barrel and end-caps, which are the first areas where corrosion initiates.<\/p>\n<\/div>\n<\/div>\n<div style=\"display: flex; gap: 0; border: 1px solid #e2e8f0; border-radius: 4px; overflow: hidden;\">\n<div style=\"background: #1e3a5f; min-width: 110px; display: flex; align-items: center; justify-content: center; padding: 0 12px; flex-shrink: 0;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; text-align: center; margin: 0; text-transform: uppercase;\">ROD SURFACE<br \/>\nPROTECTION<\/p>\n<\/div>\n<div style=\"padding: 13px 18px; background: #f8fafc; flex: 1;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">The platform lift cylinder rod is exposed to the dock pit atmosphere every time the platform is raised and then retracted. Standard hard chrome (25\u201335 \u03bcm) provides adequate corrosion resistance for inland docks in temperate climates. For coastal locations, cold-climate facilities with heavy road salt use, or food distribution docks with acidic cleaning chemical washdown, upgrade to stainless steel rod (316L) or HVOF rod coating \u2014 both provide significantly better corrosion resistance than chrome in chemically aggressive dock environments.<\/p>\n<\/div>\n<\/div>\n<div style=\"display: flex; gap: 0; border: 1px solid #e2e8f0; border-radius: 4px; overflow: hidden;\">\n<div style=\"background: #059669; min-width: 110px; display: flex; align-items: center; justify-content: center; padding: 0 12px; flex-shrink: 0;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; text-align: center; margin: 0; text-transform: uppercase;\">WIPER<br \/>\nPROTECTION<\/p>\n<\/div>\n<div style=\"padding: 13px 18px; background: #fff; flex: 1;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">Road salt crystals carried on the platform lift cylinder rod are small enough to pass a standard rubber wiper and reach the rod seal. A metal scraper ring at the outermost position of the gland removes the solid salt crystals before they can abrade the rod seal \u2014 this is the same wiper upgrade specified for refuse vehicle packing blade cylinders and for the same reason: solid particle exclusion before it reaches the elastomeric sealing elements.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<p><!-- S6 --><\/p>\n<section id=\"s6\" style=\"margin: 56px 0 0;\">\n<div style=\"display: flex; align-items: stretch; gap: 0; margin-bottom: 22px;\">\n<div style=\"width: 4px; background: linear-gradient(180deg,#d97706,#f59e0b); border-radius: 2px; flex-shrink: 0;\"><\/div>\n<div style=\"padding: 10px 16px; background: #fff; border: 1px solid #e2e8f0; border-left: none; flex: 1;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #d97706; margin: 0 0 3px;\">BAGIAN 06<\/p>\n<h2 style=\"font-size: clamp(17px,2.4vw,22px); font-weight: 800; color: #0f1e35; margin: 0; line-height: 1.2;\">Maintenance Schedule for Dock Leveller Cylinders<\/h2>\n<\/div>\n<\/div>\n<p style=\"font-size: 16px; margin-bottom: 16px;\">The dock leveller lift cylinder is typically installed and forgotten until it fails \u2014 partly because the cylinder is concealed in the dock pit and not visible during normal operation, and partly because dock leveller hydraulic maintenance is often not included in any facility&#8217;s regular maintenance programme. A structured preventive schedule dramatically extends cylinder service life and avoids the unplanned dock downtime that disrupts inbound and outbound logistics operations:<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 2px; margin: 0 0 22px;\">\n<div style=\"display: grid; grid-template-columns: 130px 1fr; border: 1px solid #e2e8f0; border-radius: 4px 4px 0 0; overflow: hidden;\">\n<div style=\"background: #d97706; padding: 12px 14px; display: flex; flex-direction: column; justify-content: center;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; margin: 0; text-transform: uppercase;\">BULANAN<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 12px 18px;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">Inspect the platform lift cylinder rod for oil weeping at the gland \u2014 any oil visible on the rod at the dock pit floor level indicates the rod seal is passing its service life. Check the hydraulic reservoir level in the HPU unit. Verify that the platform holds its set height for a 5-minute static test with a loaded forklift on it \u2014 platform descent greater than 10 mm in 5 minutes requires immediate cylinder inspection.<\/p>\n<\/div>\n<\/div>\n<div style=\"display: grid; grid-template-columns: 130px 1fr; border: 1px solid #e2e8f0; border-left: 1px solid #e2e8f0; overflow: hidden;\">\n<div style=\"background: #1e3a5f; padding: 12px 14px; display: flex; flex-direction: column; justify-content: center;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; margin: 0; text-transform: uppercase;\">TRIWULANAN<\/p>\n<\/div>\n<div style=\"background: #f8fafc; padding: 12px 18px;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">Clean the dock pit and lift cylinder outer surfaces with a pressure washer \u2014 remove accumulated road salt and organic debris from all surfaces. Apply corrosion-preventive wax to all exposed steel and the cylinder rod after cleaning. Verify the POCV function: raise platform to working height, shut off the HPU power, and check that the platform holds position for 10 minutes with rated load. Replace the HPU hydraulic filter element.<\/p>\n<\/div>\n<\/div>\n<div style=\"display: grid; grid-template-columns: 130px 1fr; border: 1px solid #e2e8f0; border-left: 1px solid #e2e8f0; overflow: hidden;\">\n<div style=\"background: #059669; padding: 12px 14px; display: flex; flex-direction: column; justify-content: center;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; margin: 0; text-transform: uppercase;\">ANNUALLY<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 12px 18px;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">Replace hydraulic oil and filter in HPU unit. Replace lift cylinder rod seal kit (gland seals, wiper, metal scraper) as preventive action on docks operating more than 40 cycles per day. Inspect cylinder outer coating for rust blistering or mechanical damage from dock pit debris \u2014 touch up any bare metal areas immediately. Check all port connection torques and re-torque any fittings that have moved. Inspect lip cylinder for rod scoring from road debris contact during extension.<\/p>\n<\/div>\n<\/div>\n<div style=\"display: grid; grid-template-columns: 130px 1fr; border: 1px solid #e2e8f0; border-radius: 0 0 4px 4px; overflow: hidden;\">\n<div style=\"background: #475569; padding: 12px 14px; display: flex; flex-direction: column; justify-content: center;\">\n<p style=\"font-size: 10px; font-weight: 800; color: #fff; margin: 0; text-transform: uppercase;\">5 YEARS<\/p>\n<\/div>\n<div style=\"background: #f8fafc; padding: 12px 18px;\">\n<p style=\"font-size: 14px; color: #374151; margin: 0; line-height: 1.65;\">Full lift cylinder inspection: remove from dock pit, full disassembly, bore inspection, rod chrome thickness measurement, and pressure test at 1.5\u00d7 working pressure. Any rod below 15 \u03bcm chrome thickness should be re-chromed or the cylinder replaced. This 5-year inspection typically identifies whether the cylinder can continue in service for another 5-year period or requires rebuilding \u2014 a dock leveller platform lift cylinder in a clean, well-maintained installation should readily achieve a 10\u201315 year service life between complete overhauls.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #e2e8f0; border-left: 4px solid #d97706; padding: 14px 20px; border-radius: 0 4px 4px 0;\">\n<p style=\"font-size: 13.5px; color: #374151; margin: 0; line-height: 1.7;\">Replacement dock leveller platform lift cylinders and lip extension cylinders \u2014 dimensionally matched to all major dock equipment brands including Assa Abloy, Hormann, Stertil-Koni, and Loading Systems \u2014 are available from the <a style=\"color: #1e3a5f; font-weight: 600; text-decoration: none;\" href=\"https:\/\/lift-cylinders.com\/id\/product-category\/lift-cylinder\/\">silinder pengangkat<\/a> product range. Provide the dock leveller brand, model, and serial number, along with the existing cylinder bore, stroke, and port thread specification, to ensure a dimensionally identical replacement is supplied.<\/p>\n<\/div>\n<\/section>\n<p><!-- FAQ --><\/p>\n<section style=\"margin: 64px 0 0;\">\n<div style=\"display: flex; align-items: stretch; gap: 0; margin-bottom: 24px;\">\n<div style=\"width: 4px; background: linear-gradient(180deg,#d97706,#f59e0b); border-radius: 2px; flex-shrink: 0;\"><\/div>\n<div style=\"padding: 10px 16px; background: #0f1e35; border-left: none; flex: 1;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #d97706; margin: 0 0 3px;\">FAQ APLIKASI<\/p>\n<h2 id=\"faq\" style=\"font-size: clamp(17px,2.4vw,22px); font-weight: 800; color: #fff; margin: 0; line-height: 1.2;\">Dock Leveller Cylinder Questions<\/h2>\n<\/div>\n<\/div>\n<div style=\"display: flex; flex-direction: column; gap: 2px;\">\n<div style=\"border: 1px solid #e2e8f0; border-radius: 4px 4px 0 0; overflow: hidden; margin-bottom: 2px;\">\n<div style=\"background: #1e3a5f; padding: 13px 18px; display: flex; align-items: center; gap: 10px;\">\n<p><span style=\"background: #d97706; color: #fff; font-size: 10px; font-weight: 800; padding: 2px 8px; border-radius: 2px; flex-shrink: 0;\">Pertanyaan 01<\/span><\/p>\n<p style=\"font-size: 14px; font-weight: bold; color: #fff; margin: 0; line-height: 1.3;\">Our dock leveller platform is slowly sinking during truck loading \u2014 the rod seal was replaced last month. What else could cause this?<\/p>\n<\/div>\n<div style=\"padding: 18px 20px; background: #fff;\">\n<p style=\"font-size: 15px; color: #374151; margin: 0; line-height: 1.75;\">Platform descent after a recent rod seal replacement almost always indicates that the piston seal \u2014 not the rod seal \u2014 is the primary leakage path. The piston seal in a dock leveller platform lift cylinder allows oil to bypass from the cap-end to the rod-end of the cylinder internally, causing the platform to slowly sink even though there is no visible external oil leak at the gland. To confirm: raise the platform to working height, close the control valve, and measure platform position every 2 minutes for 10 minutes. If the platform descends continuously without any visible oil at the gland, the piston seal is bypassing. The repair requires full cylinder disassembly, piston seal replacement, and a post-rebuild pressure test before reinstallation. If the dock leveller uses a single-acting plunger cylinder (no piston), then platform drift is caused by the POCV allowing small internal bypass \u2014 the POCV itself requires inspection and possibly replacement.<\/p>\n<\/div>\n<\/div>\n<div style=\"border: 1px solid #e2e8f0; overflow: hidden; margin-bottom: 2px;\">\n<div style=\"background: #1e3a5f; padding: 13px 18px; display: flex; align-items: center; gap: 10px;\">\n<p><span style=\"background: #059669; color: #fff; font-size: 10px; font-weight: 800; padding: 2px 8px; border-radius: 2px; flex-shrink: 0;\">Pertanyaan 02<\/span><\/p>\n<p style=\"font-size: 14px; font-weight: bold; color: #fff; margin: 0; line-height: 1.3;\">The dock leveller platform rises but the lip does not extend \u2014 what should I check first?<\/p>\n<\/div>\n<div style=\"padding: 18px 20px; background: #fff;\">\n<p style=\"font-size: 15px; color: #374151; margin: 0; line-height: 1.75;\">A platform that rises normally but a lip that does not extend indicates either an electrical issue (the lip solenoid valve is not energising) or a hydraulic flow problem specific to the lip circuit. Check the solenoid valve operation first \u2014 hold the lip extension button and listen for the solenoid click, or check the valve voltage with a multimeter. If the solenoid is energising, check the hydraulic flow to the lip lift cylinder by disconnecting the cap-end hose and operating the lip button \u2014 if oil flows from the disconnected port, the problem is in the lip cylinder itself (stuck rod, collapsed seal, frozen piston). If no oil flows even with the solenoid energised and pump running, the lip circuit flow control valve may be fully closed, a hose may be kinked or disconnected internally, or the directional valve spool may be seized. The lip extension cylinder is typically the smallest and simplest hydraulic cylinder in the dock leveller system \u2014 if it is not moving with correct pressure applied, the most likely cause is a seized rod from corrosion during a period when the dock was not used regularly.<\/p>\n<\/div>\n<\/div>\n<div style=\"border: 1px solid #e2e8f0; overflow: hidden; margin-bottom: 2px;\">\n<div style=\"background: #1e3a5f; padding: 13px 18px; display: flex; align-items: center; gap: 10px;\">\n<p><span style=\"background: #1e3a5f; color: #f59e0b; font-size: 10px; font-weight: 800; padding: 2px 8px; border: 1px solid #f59e0b; border-radius: 2px; flex-shrink: 0;\">Pertanyaan 03<\/span><\/p>\n<p style=\"font-size: 14px; font-weight: bold; color: #fff; margin: 0; line-height: 1.3;\">Can a dock leveller lift cylinder be replaced with a cylinder of a different bore to increase the leveller&#8217;s load capacity?<\/p>\n<\/div>\n<div style=\"padding: 18px 20px; background: #fff;\">\n<p style=\"font-size: 15px; color: #374151; margin: 0; line-height: 1.75;\">Not without a complete structural review of the dock leveller. Increasing the lift cylinder bore to generate more force allows heavier forklift trucks on the leveller, but the leveller&#8217;s steel platform structure, lip hinge, and pit frame were all designed for the original rated capacity. The increased load would stress these components beyond their design limits. Additionally, the HPU unit (pump, motor, and reservoir) must be capable of supplying the higher flow required by the larger bore cylinder at the same system pressure \u2014 if it is not, the larger lift cylinder will extend and retract more slowly than the original. The correct process for increasing a dock leveller&#8217;s rated capacity is to contact the dock leveller manufacturer and request a formal capacity upgrade \u2014 which may involve replacing the entire leveller or at minimum upgrading the structural components along with the hydraulic cylinders.<\/p>\n<\/div>\n<\/div>\n<div style=\"border: 1px solid #e2e8f0; border-radius: 0 0 4px 4px; overflow: hidden; margin-bottom: 64px;\">\n<div style=\"background: #1e3a5f; padding: 13px 18px; display: flex; align-items: center; gap: 10px;\">\n<p><span style=\"background: #d97706; color: #fff; font-size: 10px; font-weight: 800; padding: 2px 8px; border-radius: 2px; flex-shrink: 0;\">Pertanyaan 04<\/span><\/p>\n<p style=\"font-size: 14px; font-weight: bold; color: #fff; margin: 0; line-height: 1.3;\">How should we specify a dock leveller lift cylinder replacement for a cold storage facility where dock pits reach \u221218\u00b0C?<\/p>\n<\/div>\n<div style=\"padding: 18px 20px; background: #fff;\">\n<p style=\"font-size: 15px; color: #374151; margin: 0; line-height: 1.75;\">A dock leveller lift cylinder in a \u221218\u00b0C cold store dock pit requires three modifications from standard specification. First, the hydraulic oil in the HPU must be a low-temperature grade \u2014 ISO 32 HV with a pour point below \u221235\u00b0C \u2014 to remain pumpable at cold store ambient temperature. Standard ISO 46 oil becomes highly viscous at \u221218\u00b0C and stresses the HPU pump seals. Second, the lift cylinder rod seal must be specified in Arctic-grade polyurethane or FKM (Viton) rated to \u221240\u00b0C \u2014 standard NBR seals become brittle and crack at cold store temperatures, causing immediate failure when the seal is dynamically loaded on the first extension stroke of the shift. Third, the POCV should be verified for correct function at low temperature \u2014 some POCV designs use elastomeric seats that stiffen at \u221218\u00b0C and can either stick open (allowing drift) or refuse to open (preventing platform lowering) at extreme cold. Specify a POCV with a PTFE seat or an all-metal seat and spring for cold store dock leveller lift cylinder installations.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<div style=\"margin: 0 0 72px; background: #0f1e35; border-radius: 4px; overflow: hidden; position: relative;\">\n<div style=\"height: 4px; background: linear-gradient(90deg,#d97706,#f59e0b,#d97706);\"><\/div>\n<div style=\"position: relative; padding: clamp(32px,5vw,52px) clamp(24px,4vw,48px); text-align: center;\">\n<p style=\"font-size: 9px; font-weight: 800; letter-spacing: 3px; text-transform: uppercase; color: #d97706; margin: 0 0 14px;\">DOCK LEVELLER LIFT CYLINDER SUPPLY<\/p>\n<h2 style=\"font-size: clamp(18px,3vw,28px); font-weight: 900; color: #fff; margin: 0 0 14px; letter-spacing: -0.5px;\">Replacing a Dock Leveller Lift Cylinder?<\/h2>\n<p style=\"font-size: 15px; color: #94a3b8; max-width: 520px; margin: 0 auto 28px; line-height: 1.65;\">Send us the dock leveller brand and model, the existing cylinder bore, stroke, and port thread, and our team will supply a dimensionally matched replacement <a style=\"color: #f59e0b; font-weight: bold; text-decoration: none;\" href=\"https:\/\/lift-cylinders.com\/id\/\">silinder pengangkat<\/a> with the correct corrosion protection and seal specification for your dock environment.<\/p>\n<p><a style=\"display: inline-flex; align-items: center; gap: 8px; background: #d97706; color: #fff; padding: 14px 36px; border-radius: 3px; text-decoration: none; font-weight: 800; font-size: 14px; letter-spacing: 0.5px; text-transform: uppercase;\" href=\"https:\/\/lift-cylinders.com\/id\/contact\/\">Request Dock Leveller Cylinder Replacement <span style=\"font-size: 16px;\">\u2192<\/span><\/a><\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p style=\"text-align: right;\"><em>Editor: Cxm<\/em><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>APPLICATION GUIDE \u00b7 DOCK &amp; LOGISTICS \u00b7 HYDRAULIC LIFT CYLINDERS Dock Leveller Hydraulic Lift Cylinders Platform \u00b7 Lip \u00b7 Ramp The hydraulic dock leveller is one of the most heavily cycled pieces of fixed industrial equipment in any distribution centre or logistics facility \u2014 a high-throughput warehouse dock can complete 80\u2013120 truck loading cycles per [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1391],"tags":[],"class_list":["post-1302","post","type-post","status-publish","format-standard","hentry","category-hydraulic-lift-cylinder"],"_links":{"self":[{"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/posts\/1302","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/comments?post=1302"}],"version-history":[{"count":2,"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/posts\/1302\/revisions"}],"predecessor-version":[{"id":1305,"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/posts\/1302\/revisions\/1305"}],"wp:attachment":[{"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/media?parent=1302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/categories?post=1302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lift-cylinders.com\/id\/wp-json\/wp\/v2\/tags?post=1302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}