{"id":5598,"date":"2023-01-11T16:42:50","date_gmt":"2023-01-11T22:42:50","guid":{"rendered":"https:\/\/ddmgaragedoors.com\/blog\/?p=5598"},"modified":"2023-06-23T15:02:14","modified_gmt":"2023-06-23T21:02:14","slug":"how-to-rebuild-a-serco-hold-down-unit","status":"publish","type":"post","link":"https:\/\/ddmgaragedoors.com\/blog\/2023\/01\/11\/how-to-rebuild-a-serco-hold-down-unit\/","title":{"rendered":"How to Rebuild a Serco Hold Down Unit"},"content":{"rendered":"\n<p>In this video, Dan explains how to take apart and then put back together a Serco <a href=\"https:\/\/ddmgaragedoors.com\/dock-leveler-parts\/parts\/serco-dock-leveler-parts.html\">dock leveler<\/a> hold down unit.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"How to Rebuild a Serco Hold Down Unit\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/oEx4uvpeTHk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-disassemble-the-hold-down-unit\">Disassemble the Hold Down Unit<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-in-the-dock-leveler.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-in-the-dock-leveler-1024x576.png\" alt=\"A Serco hold down unit in the dock leveler\" class=\"wp-image-5613\" width=\"326\" height=\"183\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-in-the-dock-leveler-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-in-the-dock-leveler-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-in-the-dock-leveler-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-in-the-dock-leveler-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-in-the-dock-leveler.png 1920w\" sizes=\"auto, (max-width: 326px) 100vw, 326px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Serco hold down unit in the dock leveler<\/strong><\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-1024x576.png\" alt=\"Serco hold down unit that we used for demonstration purposes in the video.\" class=\"wp-image-5614\" width=\"326\" height=\"182\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit.png 1920w\" sizes=\"auto, (max-width: 326px) 100vw, 326px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Serco hold down unit used for demonstration purposes<\/strong><\/figcaption><\/figure>\n\n\n\n<p>To take apart and rebuild a <a href=\"https:\/\/sercodockproducts.com\/interior-equipment\/dock-levelers\/\">Serco<\/a> hold down unit, you will need 9\/16&#8243; and 3\/4&#8243; wrenches, as well as an adjustable wrench.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-setup\">Setup<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-it-in-place-with-two-maintenance-struts.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-it-in-place-with-two-maintenance-struts-1024x576.png\" alt=\"Dan securing the dock leveler in place\" class=\"wp-image-5603\" width=\"328\" height=\"184\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-it-in-place-with-two-maintenance-struts-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-it-in-place-with-two-maintenance-struts-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-it-in-place-with-two-maintenance-struts-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-it-in-place-with-two-maintenance-struts-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-it-in-place-with-two-maintenance-struts.png 1920w\" sizes=\"auto, (max-width: 328px) 100vw, 328px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Securing the dock leveler in place<\/strong><\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Firstly, make sure the area you will be working in is secure.<\/li>\n\n\n\n<li>Raise the deck of the leveler, then secure it in place with two maintenance struts.<\/li>\n\n\n\n<li>Before disassembling the unit, support the rack with a C-clamp.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/C-Clamp.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/C-Clamp-1024x578.png\" alt=\"Supporting the rack with a c-clamp\" class=\"wp-image-5604\" width=\"328\" height=\"185\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/C-Clamp-1024x578.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/C-Clamp-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/C-Clamp-768x433.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/C-Clamp-1536x866.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/C-Clamp.png 1915w\" sizes=\"auto, (max-width: 328px) 100vw, 328px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>C-clamp<\/strong><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-remove-the-hold-down-unit\">Remove the Hold Down Unit<\/h3>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>Next, remove the release rod assembly.\n<ol class=\"wp-block-list\">\n<li>Remove the pin.<\/li>\n\n\n\n<li>Then, lift and separate the release rod.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Rod-Assembly.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Rod-Assembly-1024x576.png\" alt=\"Release rod assembly in a Serco dock leveler\" class=\"wp-image-5607\" width=\"329\" height=\"184\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Rod-Assembly-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Rod-Assembly-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Rod-Assembly-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Rod-Assembly-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Rod-Assembly.png 1920w\" sizes=\"auto, (max-width: 329px) 100vw, 329px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Release rod assembly<\/strong><\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\" start=\"5\">\n<li>Remove the two 1\/2&#8243; lock nuts and bolts that attach the <a href=\"https:\/\/ddmgaragedoors.com\/dock-leveler-parts\/parts\/part\/DLSC-328-792.html\">release gear<\/a> assembly to the housing assembly, using 3\/4&#8243; wrenches.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/12-inch-locknut.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/12-inch-locknut-1024x593.png\" alt=\"1\/2-inch lock nuts in the Serco hold-up unit\" class=\"wp-image-5608\" width=\"326\" height=\"188\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/12-inch-locknut-1024x593.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/12-inch-locknut-300x174.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/12-inch-locknut-768x445.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/12-inch-locknut-1536x890.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/12-inch-locknut.png 1864w\" sizes=\"auto, (max-width: 326px) 100vw, 326px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>1\/2&#8243; lock nuts holding the Serco hold-up unit together<\/strong><\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\" start=\"6\">\n<li>Release the C-clamp.<\/li>\n\n\n\n<li>Remove all parts from the <a href=\"https:\/\/ddmgaragedoors.com\/dock-leveler-parts\/parts\/part\/DLSC-8-8102.html\">housing assembly<\/a> and rack.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Gear-and-Housing-Assemblies.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Gear-and-Housing-Assemblies-1024x576.png\" alt=\"Separating the release gear assembly from the housing assembly\" class=\"wp-image-5609\" width=\"327\" height=\"183\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Gear-and-Housing-Assemblies-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Gear-and-Housing-Assemblies-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Gear-and-Housing-Assemblies-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Gear-and-Housing-Assemblies-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-Gear-and-Housing-Assemblies.png 1920w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Serco <a href=\"https:\/\/ddmgaragedoors.com\/dock-leveler-parts\/parts\/part\/DLSC-8-8025.html\">release gear<\/a> assembly within the <a href=\"https:\/\/ddmgaragedoors.com\/dock-leveler-parts\/parts\/part\/DLSC-8-8102.html\">housing assembly<\/a><\/strong><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-take-apart-the-hold-down-unit\">Take Apart the Hold Down Unit<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Separate-the-Pinion-Shaft-and-Guide-Assembly-from-the-Release-Gear-Assembly.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Separate-the-Pinion-Shaft-and-Guide-Assembly-from-the-Release-Gear-Assembly-1024x576.png\" alt=\"Separating the release gear assembly from the pinion, shaft, and guide assembly\" class=\"wp-image-5617\" width=\"328\" height=\"184\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Separate-the-Pinion-Shaft-and-Guide-Assembly-from-the-Release-Gear-Assembly-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Separate-the-Pinion-Shaft-and-Guide-Assembly-from-the-Release-Gear-Assembly-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Separate-the-Pinion-Shaft-and-Guide-Assembly-from-the-Release-Gear-Assembly-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Separate-the-Pinion-Shaft-and-Guide-Assembly-from-the-Release-Gear-Assembly-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Separate-the-Pinion-Shaft-and-Guide-Assembly-from-the-Release-Gear-Assembly.png 1920w\" sizes=\"auto, (max-width: 328px) 100vw, 328px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Pinion, shaft, and guide assembly separated from the release gear assembly<\/strong><\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\" start=\"8\">\n<li>Separate the <a href=\"https:\/\/ddmgaragedoors.com\/dock-leveler-parts\/parts\/part\/DLSC-8-8195.html\">pinion, shaft, and guide assembly<\/a> from the release gear assembly.<\/li>\n\n\n\n<li>Then, remove the end plate from the release gear assembly.<\/li>\n\n\n\n<li>Use the 9\/16&#8243; wrench and adjustable wrench to remove the 3\/8&#8243; lock nut on the release gear assembly.<\/li>\n<\/ol>\n\n\n\n<p>Doing this will release the tension. As a result, the return spring and shaft retaining plate should fall out.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Shaft-Retaining-Plate-and-Return-Spring-with-End-Plate-on-the-table-in-front-of-it.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Shaft-Retaining-Plate-and-Return-Spring-with-End-Plate-on-the-table-in-front-of-it-1024x576.png\" alt=\"Shaft retaining plate and return spring, with the end plate already removed\" class=\"wp-image-5612\" width=\"325\" height=\"182\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Shaft-Retaining-Plate-and-Return-Spring-with-End-Plate-on-the-table-in-front-of-it-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Shaft-Retaining-Plate-and-Return-Spring-with-End-Plate-on-the-table-in-front-of-it-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Shaft-Retaining-Plate-and-Return-Spring-with-End-Plate-on-the-table-in-front-of-it-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Shaft-Retaining-Plate-and-Return-Spring-with-End-Plate-on-the-table-in-front-of-it-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Shaft-Retaining-Plate-and-Return-Spring-with-End-Plate-on-the-table-in-front-of-it.png 1920w\" sizes=\"auto, (max-width: 325px) 100vw, 325px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Shaft Retaining Plate and Return Spring. The Pinion, Shaft, and Guide Assembly can be seen on the bottom left, next to the end plate.<\/strong><\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\" start=\"11\">\n<li>Remove the lock nut completely.<\/li>\n\n\n\n<li>Finally, separate the <a href=\"https:\/\/ddmgaragedoors.com\/dock-leveler-parts\/parts\/part\/DLSC-8-8132.html\">release lever<\/a> assembly from the release gear assembly.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-lever-assembly-with-Serco-hold-down-unit-completely-disassembled.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-lever-assembly-with-Serco-hold-down-unit-completely-disassembled-1024x576.png\" alt=\"A fully disassembled Serco hold down unit\" class=\"wp-image-5615\" width=\"327\" height=\"183\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-lever-assembly-with-Serco-hold-down-unit-completely-disassembled-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-lever-assembly-with-Serco-hold-down-unit-completely-disassembled-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-lever-assembly-with-Serco-hold-down-unit-completely-disassembled-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-lever-assembly-with-Serco-hold-down-unit-completely-disassembled-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Release-lever-assembly-with-Serco-hold-down-unit-completely-disassembled.png 1920w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Release lever assembly, among the parts of a Serco hold down unit that has been completely disassembled<\/strong><\/figcaption><\/figure>\n\n\n\n<p>Now that the Serco hold down unit has been disassembled, you can reassemble it and replace the necessary parts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-rebuilding-the-serco-hold-down-unit\">Rebuilding the Serco Hold Down Unit<\/h2>\n\n\n\n<p>When rebuilding a Serco hold down unit, the parts must be reinstalled in a slightly different order than they were removed. Before you do so, be sure to grease the shaft on the <a href=\"https:\/\/ddmgaragedoors.com\/dock-leveler-parts\/parts\/part\/DLSC-589-0018.html\">pinion, shaft, and guide assembly<\/a>, if it is not greased already.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-replacing-the-hold-down-unit\">Replacing the Hold Down Unit<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Reattach the release gear assembly and the pinion, shaft, and guide assembly.<\/li>\n\n\n\n<li>Then, replace both in the housing assembly.<\/li>\n\n\n\n<li>When you replace the assembly, make sure the rack is correctly positioned inside the guide assembly.<\/li>\n\n\n\n<li>C-clamp the rack in place.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-rebuilding-the-hold-down-unit\">Rebuilding the Hold Down Unit<\/h3>\n\n\n\n<ol class=\"wp-block-list\" start=\"5\">\n<li>Slide the spring onto the shaft.<\/li>\n\n\n\n<li>Then, replace the shaft retaining plate.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Replace-the-Shaft-Retaining-Plate.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Replace-the-Shaft-Retaining-Plate-1024x576.png\" alt=\"Replacing the shaft retaining plate, where the two 1\/2 inch hex bolts will slide through\" class=\"wp-image-5626\" width=\"327\" height=\"183\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Replace-the-Shaft-Retaining-Plate-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Replace-the-Shaft-Retaining-Plate-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Replace-the-Shaft-Retaining-Plate-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Replace-the-Shaft-Retaining-Plate-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Replace-the-Shaft-Retaining-Plate.png 1920w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Replacing the shaft retaining plate<\/strong><\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\" start=\"7\">\n<li>Replace the end plate.<\/li>\n\n\n\n<li>Reinsert both 1\/2&#8243; hex bolts with their washers.<\/li>\n\n\n\n<li>Secure with the 1\/2&#8243; lock nuts.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-with-the-Half-Inch-Lock-Nuts.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-with-the-Half-Inch-Lock-Nuts-1024x686.png\" alt=\"The location of the two 1\/2 inch hex bolts in the housing assembly\" class=\"wp-image-5623\" width=\"324\" height=\"217\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-with-the-Half-Inch-Lock-Nuts-1024x686.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-with-the-Half-Inch-Lock-Nuts-300x201.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-with-the-Half-Inch-Lock-Nuts-768x515.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-with-the-Half-Inch-Lock-Nuts-1536x1030.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Secure-with-the-Half-Inch-Lock-Nuts.png 1611w\" sizes=\"auto, (max-width: 324px) 100vw, 324px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Reinserting the 1\/2&#8243; hex bolts<\/strong><\/figcaption><\/figure>\n\n\n\n<p>To maintain the correct alignment, finger-tighten both lock nuts before tightening fully with the 3\/4&#8243; wrench. When using the wrench, alternate between each set of nuts.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Using-the-Three-Quarter-Inch-Wrench.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Using-the-Three-Quarter-Inch-Wrench-1024x576.png\" alt=\"Using two wrenches to tighten the 1\/2 inch lock nuts\" class=\"wp-image-5622\" width=\"327\" height=\"183\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Using-the-Three-Quarter-Inch-Wrench-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Using-the-Three-Quarter-Inch-Wrench-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Using-the-Three-Quarter-Inch-Wrench-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Using-the-Three-Quarter-Inch-Wrench-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Using-the-Three-Quarter-Inch-Wrench.png 1920w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Tightening the 1\/2&#8243; lock nuts<\/strong><\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\" start=\"10\">\n<li>Slide the <a href=\"https:\/\/ddmgaragedoors.com\/dock-leveler-parts\/parts\/part\/DLSC-8-8132.html\">release lever<\/a> into position.<\/li>\n\n\n\n<li>Insert the 3\/8&#8243; hex bolt, and secure with a 3\/8&#8243; lock nut. Then, using the 9\/16&#8243; wrench, tighten the 3\/8&#8243; nut and bolt.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Until-Secure.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Until-Secure-1024x576.png\" alt=\"Tightening the 3\/8 inch hex bolt to secure the release lever in place\" class=\"wp-image-5625\" width=\"326\" height=\"182\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Until-Secure-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Until-Secure-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Until-Secure-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Tighten-Until-Secure.png 1920w\" sizes=\"auto, (max-width: 326px) 100vw, 326px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Tightening the 3\/8&#8243; hex bolt that secures the release lever in place<\/strong><\/figcaption><\/figure>\n\n\n\n<p>Tighten until the assembly is secure, while leaving it loose enough for unimpeded operation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-finishing-up\">Finishing Up<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Check-that-the-gears-release-properly.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Check-that-the-gears-release-properly-1024x576.png\" alt=\"Testing that the gears release properly after having been reinstalled\" class=\"wp-image-5621\" width=\"327\" height=\"183\" srcset=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Check-that-the-gears-release-properly-1024x576.png 1024w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Check-that-the-gears-release-properly-300x169.png 300w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Check-that-the-gears-release-properly-768x432.png 768w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Check-that-the-gears-release-properly-1536x864.png 1536w, https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Check-that-the-gears-release-properly.png 1920w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/a><figcaption class=\"wp-element-caption\"><strong>Making sure the gears release properly on a fully installed Serco hold down unit<\/strong><\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\" start=\"12\">\n<li>Test that the lever functions properly, and readjust the 3\/8&#8243; nut and bolt as needed.<\/li>\n\n\n\n<li>Then, make sure that the gears release properly.<\/li>\n\n\n\n<li>Remove the C-clamp.<\/li>\n\n\n\n<li>Lastly, reattach the release rod to the release lever, and secure with the pin.<\/li>\n<\/ol>\n\n\n\n<p>We hope this helps you to repair or replace your Serco hold down unit. More information about dock levelers is located in our blog posts about <a href=\"https:\/\/ddmgaragedoors.com\/blog\/2018\/08\/17\/dock-leveler-snubber-assemblies\/\">snubber assemblies<\/a> and <a href=\"https:\/\/ddmgaragedoors.com\/blog\/2015\/10\/30\/dock-leveler-hinge-lubrication\/\">hinge lubrication<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this video, Dan explains how to take apart and then put back together a Serco dock leveler hold down unit. Disassemble the Hold Down Unit To take apart and rebuild a Serco hold down unit, you will need 9\/16&#8243; and 3\/4&#8243; wrenches, as well as an adjustable wrench. Setup Remove the Hold Down Unit [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[247,5],"tags":[346,534,352],"class_list":["post-5598","post","type-post","status-publish","format-standard","hentry","category-products","category-technical-support","tag-diy-instructions","tag-dock-levelers","tag-garage-door-repair"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.2 (Yoast SEO v25.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Rebuild a Serco Hold Down Unit - DDM Garage Doors Blog<\/title>\n<meta name=\"description\" content=\"In this video, Dan explains how to take apart and then put back together a Serco dock leveler hold down unit.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ddmgaragedoors.com\/blog\/2023\/01\/11\/how-to-rebuild-a-serco-hold-down-unit\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Rebuild a Serco Hold Down Unit\" \/>\n<meta property=\"og:description\" content=\"In this video, Dan explains how to take apart and then put back together a Serco dock leveler hold down unit.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ddmgaragedoors.com\/blog\/2023\/01\/11\/how-to-rebuild-a-serco-hold-down-unit\/\" \/>\n<meta property=\"og:site_name\" content=\"DDM Garage Doors Blog\" \/>\n<meta property=\"article:published_time\" content=\"2023-01-11T22:42:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-23T21:02:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ddmgaragedoors.com\/blog\/uploads\/2023\/01\/Serco-hold-down-unit-in-the-dock-leveler-1024x576.png\" \/>\n<meta name=\"author\" content=\"Philip Kendall\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Philip Kendall\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/ddmgaragedoors.com\/blog\/2023\/01\/11\/how-to-rebuild-a-serco-hold-down-unit\/\",\"url\":\"https:\/\/ddmgaragedoors.com\/blog\/2023\/01\/11\/how-to-rebuild-a-serco-hold-down-unit\/\",\"name\":\"How to Rebuild a Serco Hold Down Unit - 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