{"id":3702,"date":"2026-09-12T03:21:00","date_gmt":"2026-09-11T19:21:00","guid":{"rendered":"https:\/\/www.raxdoors.com\/blog\/how-hydraulic-dock-leveler-works\/"},"modified":"2026-09-14T02:14:39","modified_gmt":"2026-09-13T18:14:39","slug":"how-hydraulic-dock-leveler-works","status":"publish","type":"post","link":"https:\/\/www.raxdoors.com\/pt\/blog\/how-hydraulic-dock-leveler-works\/","title":{"rendered":"Como um Nivelador Hidr\u00e1ulico de Doca Funciona Passo a Passo"},"content":{"rendered":"<style>\np { line-height: 1.8; margin-bottom: 28px; }\ntable { display: table !important; width: 100% !important; border-collapse: collapse; margin-bottom: 28px; }\nth { text-align: left; padding: 12px 14px; background: #2a2c29; color: #ffffff; font-weight: 600; }\ntd { padding: 12px 14px; border-bottom: 1px solid #e5e5e5; vertical-align: top; }\ntr:nth-child(even) td { background: #f9f9f9; }\nfigcaption { text-align: center; font-style: italic; }\n<\/style>\n<p>It is 4:50 on a Tuesday afternoon, and bay 6 of a food distribution center is running behind. The driver has set the trailer brakes, and the open dock door hangs over a gap the height of a coffee can. The operator presses a green button once, and the steel deck rises out of its pit. A hinged lip settles flat on the trailer bed, and a forklift crosses ten seconds later.<\/p>\n<p>That quiet sequence shows the hydraulic dock leveler working principle in full: pressurized oil does the lifting, the reaching and the lowering. Nobody heaves a platform by hand. Once you can trace the oil through one full cycle, most faults announce themselves early.<\/p>\n<h2 id=\"the-parts-inside-a-hydraulic-leveler\">The Parts Inside a Hydraulic Leveler<\/h2>\n<p><a href=\"https:\/\/www.raxdoors.com\/blog\/hydraulic-or-mechanical-dock-levellers\/\">A hydraulic dock leveler<\/a> sits in a pit at the door&#8217;s edge, about 24 inches deep. The rear edge is hinged, so the deck swings up like a seesaw. Three powered parts do the work. An electric motor drives a small pump station, a main lift cylinder sits under the deck, and a second cylinder moves the lip plate.<\/p>\n<figure style=\"margin:0 0 28px;\">\n<img decoding=\"async\" src=\"https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-1.webp\" alt=\"Red trailer truck docked at a warehouse loading dock bay\" class=\"wp-image-3699\" width=\"1200\" height=\"675\" loading=\"lazy\" srcset=\"https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-1.webp 1200w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-1-300x169.webp 300w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-1-1024x576.webp 1024w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-1-768x432.webp 768w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-1-18x10.webp 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Trailer backed into a warehouse dock bay<\/figcaption><\/figure>\n<p>The pump station is the heart. Pressing the raise button runs the motor, which pushes oil into the main cylinder and lifts the deck. The lip lives on its own oil circuit, opened by a solenoid valve, so the lip can move while the deck stays parked. A velocity fuse sits in each load line and locks the oil if flow suddenly spikes.<\/p>\n<p>Blue Giant builds its platforms with ten welded J-beam channels under the deck and rates deck flex at up to 4 inches under full load. Lip plates run 18 or 20 inches long (457 to 508 mm). Working range is roughly 12 inches above and below the dock face.<\/p>\n<div class=\"callout\" style=\"background:#f9f9f9;border-left:4px solid #2a2c29;border-radius:4px;padding:18px 22px;margin:0 0 28px;\">\n<p style=\"margin:0;\"><strong>Note:<\/strong> Manufacturers rate levelers in CIR, a dynamic capacity that includes forklift impact crossing the lip. It is not a static freight rating.<\/p>\n<\/div>\n<h2 id=\"the-operating-cycle-step-by-step\">The Operating Cycle Step by Step<\/h2>\n<p>The full cycle takes about half a minute and never asks the operator to lift anything. Each step moves oil somewhere specific, and together they lay out the hydraulic dock leveler working principle end to end, which makes faults easy to trace later.<\/p>\n<h3 id=\"press-the-button-and-the-pump-takes-over\">Press the Button and the Pump Takes Over<\/h3>\n<p>The operator presses and holds the raise button. The motor spins the pump, and oil flows into the main lift cylinder. Most controls are hold-to-run on purpose: the deck only rises while a hand is on the button.<\/p>\n<h3 id=\"the-deck-rises-and-the-lip-extends\">The Deck Rises and the Lip Extends<\/h3>\n<p>As the deck swings up around its rear hinge, a second oil path opens through the solenoid valve. The lip cylinder pushes the lip plate out past the dock edge while the deck is still above trailer height. This is the step that fails first when oil runs low, because the lip circuit is last in line.<\/p>\n<figure style=\"margin:0 0 28px;\">\n<img decoding=\"async\" src=\"https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/08\/cold-chain-forklift-bay-selection.webp\" alt=\"Forklift crossing into a trailer at a dock bay with dock control boxes mounted on the wall\" class=\"wp-image-1919\" width=\"1200\" height=\"800\" loading=\"lazy\" srcset=\"https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/08\/cold-chain-forklift-bay-selection.webp 1600w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/08\/cold-chain-forklift-bay-selection-300x200.webp 300w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/08\/cold-chain-forklift-bay-selection-1024x683.webp 1024w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/08\/cold-chain-forklift-bay-selection-768x512.webp 768w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/08\/cold-chain-forklift-bay-selection-1536x1024.webp 1536w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Forklift crossing a dock bridge into a trailer, wall controls at the bay<\/figcaption><\/figure>\n<h3 id=\"release-and-the-lip-sets-on-the-truck-bed\">Release and the Lip Sets on the Truck Bed<\/h3>\n<p>At the top of travel the operator releases the button. Gravity takes over as oil eases back through the lines, and the deck floats down. The lip rides down until it rests flat on the trailer bed.<\/p>\n<h3 id=\"float-below-dock-work-and-storage\">Float, Below-Dock Work and Storage<\/h3>\n<p>While the forklift rolls on and off, the deck stays live. Suspension movement sinks the trailer as pallets leave, and the deck follows that motion. A below-dock or end-loading mode serves trailers parked low, and a tap of the UP button returns everything to normal. The storage command parks the deck level with the floor for safe cross-traffic.<\/p>\n<h2 id=\"why-hydraulics-beat-pull-chains-and-springs\">Why Hydraulics Beat Pull Chains and Springs<\/h2>\n<p>A mechanical leveler does the same job with a torsion spring and a chain. The spring stores the lifting energy, and the operator yanks the release chain, then walks the deck down under body weight. Rite-Hite puts that walk-down effort at 120 to 175 lbs or more, every single cycle.<\/p>\n<p>The sharpest difference is the lip. A mechanical lip extends by gravity; a hydraulic lip extends under power, so it can reach a trailer bed parked low or far from the dock. Put the <a href=\"https:\/\/www.raxdoors.com\/loading-dock-systems\/\">loading dock systems<\/a> category on your shortlist at this stage, because pit depth and door layout decide the fit.<\/p>\n<table>\n<tr>\n<th>Aspect<\/th>\n<th>Hydraulic<\/th>\n<th>Mechanical<\/th>\n<\/tr>\n<tr>\n<td>Power source<\/td>\n<td>Motor-driven pump and cylinders<\/td>\n<td>Torsion spring and release chain<\/td>\n<\/tr>\n<tr>\n<td>Operator effort<\/td>\n<td>A push-button press<\/td>\n<td>120 to 175 lbs walk-down force<\/td>\n<\/tr>\n<tr>\n<td>Lip control<\/td>\n<td>Fully powered extend and retract<\/td>\n<td>Gravity drop, spring assist<\/td>\n<\/tr>\n<tr>\n<td>Fall protection<\/td>\n<td>Velocity fuse locks the oil line<\/td>\n<td>Spring-loaded safety legs<\/td>\n<\/tr>\n<tr>\n<td>Below-dock use<\/td>\n<td>Powered, about 12 inches below<\/td>\n<td>Limited by chain and spring travel<\/td>\n<\/tr>\n<\/table>\n<p>My view after watching both age in service: the button is a nice-to-have, and the velocity fuse is the real divide. A hydraulic deck that loses oil pressure locks in place instead of dropping. Rite-Hite also reports about six times more maintenance spending on mechanical levelers over ten years, a claim worth weighing against local labor rates.<\/p>\n<h2 id=\"safety-features-that-stop-a-falling-deck\">Safety Features That Stop a Falling Deck<\/h2>\n<p>The velocity fuse is a small valve with a simple job, and it is the fail-safe half of the hydraulic dock leveler working principle. Oil flows through freely at normal speeds, but if a hose bursts and flow spikes, an internal poppet slams shut. Think of the inertia lock in a car seatbelt: normal motion passes, sudden motion locks. With a forklift parked on the deck, that valve separates a service call from a crushed driver.<\/p>\n<div class=\"callout\" style=\"background:#f9f9f9;border-left:4px solid #b3261e;border-radius:4px;padding:18px 22px;margin:0 0 28px;\">\n<p style=\"margin:0;\"><strong>Safety:<\/strong> Never let anyone work under a raised deck until it rests on the maintenance prop or a verified support. Parts manuals state plainly that cylinders must not be removed until the leveler is safely supported. Oil pressure alone is not a support.<\/p>\n<\/div>\n<p>The governing standard is ANSI MH30.1, currently the 2022 edition. It sets safety, performance and testing requirements for the design, use and maintenance of dock leveling devices. OSHA has cited the standard in enforcement, including its full-length toe guard requirement. Site traffic rules sit in wider guidance such as the UK HSE&#8217;s <a href=\"https:\/\/www.hse.gov.uk\/pubns\/books\/hsg136.htm\" target=\"_blank\" rel=\"noopener\">HSG136<\/a>.<\/p>\n<p>Pair the leveler with two more devices for a practical bay. Wheel restraints stop early departure, the exact event a velocity fuse is built to survive. Dock bumpers protect the building, and our guide to <a href=\"https:\/\/www.raxdoors.com\/blog\/choosing-the-best-industrial-dock-doors\/\">choosing the best industrial dock doors<\/a> covers the door half of the bay.<\/p>\n<figure style=\"margin:0 0 28px;\">\n<img decoding=\"async\" src=\"https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-5.webp\" alt=\"Row of loading dock doors with black dock shelters and yellow bollards\" class=\"wp-image-3701\" width=\"1200\" height=\"675\" loading=\"lazy\" srcset=\"https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-5.webp 1200w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-5-300x169.webp 300w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-5-1024x576.webp 1024w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-5-768x432.webp 768w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-5-18x10.webp 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Row of loading dock doors with black shelters between trailers<\/figcaption><\/figure>\n<h2 id=\"what-regular-maintenance-actually-protects\">What Regular Maintenance Actually Protects<\/h2>\n<p>The typical failure story starts on a Monday morning. The deck rises fine, but the lip hangs limp at half extension while a loaded trailer waits. Nine times out of ten, that limp lip means low oil or a stuck solenoid valve. Both were visible a month earlier as a damp patch under the power pack.<\/p>\n<h3 id=\"fluid-level-and-contamination\">Fluid Level and Contamination<\/h3>\n<p>Start at the reservoir sight glass with the deck stored. Low oil starves the lip circuit first because it sits highest in the sequence. Milky or dark oil means water or wear debris, and contaminated fluid chews cylinder seals until the deck sags. A five-point check covers it: oil level, oil color, lip cylinder, solenoid valve, pump sound.<\/p>\n<h3 id=\"hoses-seals-and-the-slip-hazard\">Hoses, Seals and the Slip Hazard<\/h3>\n<p>Leaks show up at hose ends, swivel fittings and O-rings long before performance drops. Wipe a finger along each fitting during a walkaround and look for wet trails down the pit wall. Oil on the apron is a slip hazard on the exact concrete where forklifts brake and drivers step down.<\/p>\n<figure style=\"margin:0 0 28px;\">\n<img decoding=\"async\" src=\"https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-2.webp\" alt=\"Trailer reversing toward a loading dock seen through open industrial doors\" class=\"wp-image-3700\" width=\"1200\" height=\"675\" loading=\"lazy\" srcset=\"https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-2.webp 1200w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-2-300x169.webp 300w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-2-1024x576.webp 1024w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-2-768x432.webp 768w, https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-2-18x10.webp 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Trailer reversing onto a wet apron toward an open dock door<\/figcaption><\/figure>\n<h3 id=\"hot-weather-weak-points\">Hot Weather Weak Points<\/h3>\n<p>Summer is when marginal seals fail, because heat thins the oil and pressure rises through sun-warmed lines. Repair shops report the most calls for weeping fittings in hot months. A pre-season check of hoses costs an hour; a burst hose at peak season costs the bay a day.<\/p>\n<p>This is the payoff of knowing the hydraulic dock leveler working principle. The lip sits last in the oil path, so limp-lip symptoms point to supply, not structure. A raised deck is held by oil, so service work waits for the prop. That knowledge turns most hydraulic issues into a short fix instead of an emergency call-out. Energy losses at the same doorway are covered in our guide on <a href=\"https:\/\/www.raxdoors.com\/blog\/air-curtains-loading-dock-doors-guide\/\">air curtains for loading dock doors<\/a>.<\/p>\n<h2 id=\"frequently-asked-questions-about-hydraulic-dock-levelers\">Frequently Asked Questions About Hydraulic Dock Levelers<\/h2>\n<div class=\"faq-card\" style=\"background:#f9f9f9;border-left:4px solid #2a2c29;border-radius:4px;padding:18px 22px;margin:0 0 18px;\">\n<h3 style=\"margin-top:0;\">What should I check first when the lip will not extend?<\/h3>\n<p>Check the reservoir oil level, then the lip solenoid valve, then the lip cylinder and its hoses. A limp lip almost always means low or contaminated fluid, a stuck solenoid, or a leaking lip line. Electrical faults at the button rank last.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"background:#f9f9f9;border-left:4px solid #2a2c29;border-radius:4px;padding:18px 22px;margin:0 0 18px;\">\n<h3 style=\"margin-top:0;\">How far below the dock can a hydraulic dock leveler work?<\/h3>\n<p>Most pit-style units work about 12 inches (305 mm) above and below the dock face. A dedicated below-dock or end-loading mode lets operators serve trailers parked low, and the deck returns to normal operation with the UP button.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"background:#f9f9f9;border-left:4px solid #2a2c29;border-radius:4px;padding:18px 22px;margin:0 0 18px;\">\n<h3 style=\"margin-top:0;\">What does a velocity fuse actually do?<\/h3>\n<p>It is an inline valve that locks when oil flow suddenly spikes, such as when a hose bursts or a truck pulls away early. The loaded deck stops instead of free-falling. Every hydraulic leveler worth buying has one in each load line.<\/p>\n<\/div>\n<div class=\"faq-card\" style=\"background:#f9f9f9;border-left:4px solid #2a2c29;border-radius:4px;padding:18px 22px;margin:0 0 18px;\">\n<h3 style=\"margin-top:0;\">Can a hydraulic dock leveler work during a power cut?<\/h3>\n<p>Most units include a manual descent valve, and many add a hand pump, so the deck can be lowered without mains power. The exact procedure varies by model, so keep the manufacturer&#8217;s manual at the dock and follow its steps.<\/p>\n<\/div>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Article\",\n  \"headline\": \"How a Hydraulic Dock Leveler Works Step by Step\",\n  \"description\": \"A component-level breakdown of the hydraulic dock leveler working principle: pump station, deck and lip cylinders, the full operating cycle, fall-safe design and maintenance checks.\",\n  \"author\": {\n    \"@type\": \"Organization\",\n    \"name\": \"RAX Door Technology Industrial Automation Team\",\n    \"url\": \"https:\/\/www.raxdoors.com\/\"\n  },\n  \"datePublished\": \"2026-09-12\",\n  \"dateModified\": \"2026-09-12\",\n  \"image\": \"https:\/\/www.raxdoors.com\/wp-content\/uploads\/2026\/09\/how-hydraulic-dock-leveler-works-stock-1.webp\",\n  \"publisher\": {\n    \"@type\": \"Organization\",\n    \"name\": \"RAX Door Technology\",\n    \"url\": \"https:\/\/www.raxdoors.com\/\"\n  }\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What should I check first when the lip will not extend?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Check the reservoir oil level, then the lip solenoid valve, then the lip cylinder and its hoses. A limp lip almost always means low or contaminated fluid, a stuck solenoid, or a leaking lip line. Electrical faults at the button rank last.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How far below the dock can a hydraulic dock leveler work?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Most pit-style units work about 12 inches (305 mm) above and below the dock face. A dedicated below-dock or end-loading mode lets operators serve trailers parked low, and the deck returns to normal operation with the UP button.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does a velocity fuse actually do?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is an inline valve that locks when oil flow suddenly spikes, such as when a hose bursts or a truck pulls away early. The loaded deck stops instead of free-falling. Every hydraulic leveler worth buying has one in each load line.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can a hydraulic dock leveler work during a power cut?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Most units include a manual descent valve, and many add a hand pump, so the deck can be lowered without mains power. The exact procedure varies by model, so keep the manufacturer's manual at the dock and follow its steps.\"}\n    }\n  ]\n}\n<\/script><br \/>\n<script type=\"application\/ld+json\" id=\"evo301-geo-ai-block\">\n{\n  \"definition\": \"A hydraulic dock leveler is a pit-mounted steel ramp that bridges a loading dock floor and a truck bed using pressurized oil instead of springs. A motor-driven pump feeds a main lift cylinder that raises the deck, while a separate lip cylinder and solenoid valve extend a hinged lip onto the trailer, so a forklift can cross the gap.\",\n  \"data_statements\": [\n    \"Standard pit depth for hydraulic dock levelers is about 24 inches, and working range is roughly 12 inches (305 mm) above and below the dock face.\",\n    \"Lip plates are commonly 18 or 20 inches (457 to 508 mm) long, and welded decks flex up to 4 inches under full load.\",\n    \"Mechanical levelers require 120 to 175 lbs of walk-down force per cycle, compared with a single push-button press on hydraulic units.\",\n    \"Rite-Hite reports facilities spend about six times more maintaining mechanical levelers over a ten-year system life.\",\n    \"Inline velocity fuses lock each load line against flow spikes, stopping a loaded deck from free-falling if a hose bursts.\"\n  ],\n  \"qa_concise\": [\n    \"How does a hydraulic dock leveler work? A motor-driven pump sends oil to a lift cylinder that raises the deck, a lip cylinder extends the lip onto the trailer, and releasing the button lowers the bridge onto the truck bed.\",\n    \"What lifts the deck? Pressurized oil from an electric pump station acting on a main lift cylinder hinged at the rear of the pit.\",\n    \"What extends the lip? A separate lip cylinder fed through a solenoid valve, so the lip can move independently of the deck.\",\n    \"What stops the deck from falling? An inline velocity fuse locks the oil line when flow spikes, such as during a hose failure.\",\n    \"What fails most often? Low or contaminated hydraulic oil, and leaks at hoses, swivel fittings and O-rings, which show up as a limp lip or damp pit floor.\"\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u00e3o 4h50 de uma ter\u00e7a-feira \u00e0 tarde, e a b\u00e1ia 6 de um centro de distribui\u00e7\u00e3o de alimentos est\u00e1 atrasada. O motorista aplicou os freios do reboque, e a porta aberta da plataforma fica suspensa sobre um v\u00e3o da altura de uma lata de caf\u00e9. O operador pressiona um bot\u00e3o verde uma vez, e a plataforma de a\u00e7o sobe para fora de sua \u2026 <a title=\"Como um Nivelador Hidr\u00e1ulico de Doca Funciona Passo a Passo\" class=\"read-more\" href=\"https:\/\/www.raxdoors.com\/pt\/blog\/how-hydraulic-dock-leveler-works\/\" aria-label=\"Leia mais sobre Como um Nivelador Hidr\u00e1ulico de Doca Funciona Passo a Passo\">Ler mais<\/a><\/p>","protected":false},"author":1,"featured_media":3699,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","rank_math_title":"Hydraulic Dock Leveler Working Principle and Operation","rank_math_description":"How a hydraulic dock leveler works: pump, lift and lip cylinders, the full cycle from button press to bridge, velocity fuse safety and upkeep checks.","rank_math_focus_keyword":"hydraulic dock leveler working principle","rank_math_robots":"","rank_math_canonical_url":"","rank_math_facebook_title":"","rank_math_facebook_description":"","rank_math_twitter_title":"","rank_math_twitter_description":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_focuskw":"","_yoast_wpseo_canonical":"","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","_aioseo_title":"","_aioseo_description":"","_aioseo_keywords":"","_aioseo_robots_default":"","_aioseo_robots_noindex":"","_aioseo_og_title":"","_aioseo_og_description":"","_aioseo_twitter_title":"","_aioseo_twitter_description":"","aiosp_title":"","aiosp_description":"","aiosp_keywords":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_analysis_target_kw":"","_seopress_robots_canonical":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_genesis_title":"","_genesis_description":"","_genesis_canonical":"","_genesis_noindex":"","_genesis_nofollow":"","slim_seo":""},"categories":[9],"tags":[],"class_list":["post-3702","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-loading-dock-systems"],"_links":{"self":[{"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/posts\/3702","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/comments?post=3702"}],"version-history":[{"count":1,"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/posts\/3702\/revisions"}],"predecessor-version":[{"id":4257,"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/posts\/3702\/revisions\/4257"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/media\/3699"}],"wp:attachment":[{"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/media?parent=3702"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/categories?post=3702"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.raxdoors.com\/pt\/wp-json\/wp\/v2\/tags?post=3702"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}