{"title":"Garage Door Spring Bumpers","description":"\u003ch1 id=\"top\" class=\"title\"\u003eGarage Door Spring Bumpers\u003c\/h1\u003e\n\u003cdiv align=\"center\"\u003e\u003cimg src=\"https:\/\/ddmgaragedoors.com\/parts\/images\/detail\/spring_bumpers.jpg\" alt=\"Spring Bumpers\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eSpring bumpers serve two purposes.\u003c\/p\u003e\n\u003cp\u003eOne is to restrain sectional doors from traveling too far. On vertical lift doors spring bumpers prevent the cables from coming off the drums when the door travels too high in the tracks. As the door rises the cables move down the grooves of the drums decreasing the moment arm. After the door reaches its normal height, the cables begin to rise on the inside hubs of the drums. This increases the moment arm which causes the door to stop. When the door is thrown up too hard, the cables over-ride the raised inside grooves of the drums and the cables come off the drums, often causing the door to fall out of the tracks.\u003c\/p\u003e\n\u003cdiv align=\"center\"\u003e\u003cimg src=\"https:\/\/ddmgaragedoors.com\/parts\/images\/detail\/vertical-lift-drum-moment-arm.jpg\" alt=\"Demonstration Showing How Cables Come off Vertical Lift Cable Drums\" width=\"400\" height=\"359\"\u003e\u003c\/div\u003e\n\u003cp\u003eOn high lift doors something needs to stop the door from traveling too far after it reaches its normal height. Often this is accomplished with longer track bolts or by installing angle at the ends of the horizontal tracks. If the door comes up too hard on a manually-operated door, the top rollers will hit the bolts so hard that they bend the top fixtures. When these are left unrepaired the top section of the door will often fall out of the tracks.\u003c\/p\u003e\n\u003cdiv align=\"center\"\u003e\u003cimg src=\"https:\/\/ddmgaragedoors.com\/parts\/images\/detail\/garage-door-leaf-bumper.gif\" alt=\"How Spring Bumpers Work on High Lift Doors\" width=\"588\" height=\"296\"\u003e\u003c\/div\u003e\n\u003cp\u003eThe second purpose of spring bumpers is to prevent cables from coming off the drums when jackshaft openers such as the Liftmaster 8500 are installed. Regular trolley openers pull and push the tops of doors to open and close them. Jackshaft openers, on the other hand, turn the torsion shafts to open and close the door. The door must always be free to roll down the tracks. On some doors the inside ends of the horizontal tracks are pitched down and the door will not roll down when the shaft turns. There are also many situations where the doors have worn hardware, bent tracks, and binding hardware which prevents the door from lowering when the opener turns the shaft to lower the door. These spring bumpers provide initial thrust to start the door down on these doors. More information is on our blog titled\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/ddmgaragedoors.com\/blog\/2018\/06\/22\/how-to-install-push-down-spring-bumpers\/\"\u003eHow to Install Push Down Spring Bumpers.\u003c\/a\u003e\u003c\/p\u003e\n\u003cdiv align=\"center\"\u003e\u003cimg src=\"https:\/\/ddmgaragedoors.com\/parts\/images\/detail\/garage-door-spring-bumper.gif\" alt=\"How Garage Door Spring Bumpers Work on High Lift Doors\" width=\"600\" height=\"287\"\u003e\u003c\/div\u003e","products":[{"product_id":"sb-10","title":"Leaf Bumpers","description":"Garage Door Leaf Bumpers. Keeps your garage door from falling out the end of your tracks if something goes wrong. 12-1\/2\" long. Painted black.\u003cbr\u003e\u003cbr\u003eKit includes mounting hardware, restraint strap, and four 3\/8\" x 1-1\/4\" hex bolts and four 3\/8\" hex flange nuts.\u003cbr\u003e\u003cbr\u003eEquivalent to Clopay Part No. 0121570.\u003cbr\u003e\u003cbr\u003e Note: You'll need four additional 3\/8\" x 1\" hex bolts and four 3\/8\" hex flange nuts to attach brackets to garage. Additional fasteners can be found \u003ca href=\"https:\/\/ddmgaragedoors.com\/parts\/fasteners.html\" target=\"_blank\"\u003ehere\u003c\/a\u003e.\u003cbr\u003e\u003cbr\u003eFor more information on this part, view our \u003ca href=\"https:\/\/ddmgaragedoors.com\/blog\/2017\/06\/02\/when-are-leaf-bumpers-and-push-down-bumper-springs-necessary\/\" target=\"_blank\"\u003e\"When are leaf bumpers and push down bumper springs necessary?\"\u003c\/a\u003e blog. Need help? View our \u003ca href=\"https:\/\/ddmgaragedoors.com\/blog\/2018\/06\/22\/how-to-install-push-down-spring-bumpers\/\" target=\"_blank\"\u003eHow to Install Push Down Spring Bumpers\u003c\/a\u003e instructions.\u003cbr\u003e\u003cbr\u003e IMPORTANT: Due to supply chain shortages we currently do not offer quantity discounts, and for some of our products we are limiting the quantities that may be purchased.","brand":"Service Spring","offers":[{"title":"Default Title","offer_id":51161615565120,"sku":"SB-10","price":107.96,"currency_code":"USD","in_stock":true}]},{"product_id":"rs-27","title":"Push Down Bumper Springs 27 Inch","description":"Garage Door Push-Down Spring Bumper. For standard lift doors with jackshaft operators. The springs compress as the door reaches the open position. Length: 27\"\u003cbr\u003e\u003cbr\u003eFrom this position the springs push the door down to prevent the cables from coming off the drums when the operator starts the down cycle.\u003cbr\u003e\u003cbr\u003eTotal length: 27\"\u003cbr\u003e\u003cbr\u003e15\" compression at approximately 10lbs\/in. 12 gauge bracket for use with 3\/8\" bolts. 2\" rubber bumper. Zinc-plated steel. Equivalent to Clopay Part No. 5280237.\u003cbr\u003e\u003cbr\u003eFor more information on this part, view our \u003ca href=\"https:\/\/ddmgaragedoors.com\/blog\/2017\/06\/02\/when-are-leaf-bumpers-and-push-down-bumper-springs-necessary\/\" target=\"_blank\"\u003e\"When are leaf bumpers and push down bumper springs necessary?\"\u003c\/a\u003e blog.\u003cbr\u003e\u003cbr\u003e IMPORTANT: Due to supply chain shortages we currently do not offer quantity discounts, and for some of our products we are limiting the quantities that may be purchased.","brand":"Service Spring","offers":[{"title":"Default Title","offer_id":51161616908608,"sku":"RS-27","price":151.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/0013\/1904\/files\/RS-27.jpg?v=1782855533"},{"product_id":"rs-15","title":"Push Down Bumper Springs 15 Inch","description":"Garage Door Push-Down Spring Bumper. Keeps your garage door from falling out the end of your tracks if the door travels up too far. Total length: 15\"\u003cbr\u003e\u003cbr\u003e6\" compression at approximately 10lbs\/in. 12 gauge bracket for use with 3\/8\" bolts. 2\" rubber bumper. Zinc-plated steel.\u003cbr\u003e\u003cbr\u003eFor more information on this part, view our \u003ca href=\"https:\/\/ddmgaragedoors.com\/blog\/2017\/06\/02\/when-are-leaf-bumpers-and-push-down-bumper-springs-necessary\/\" target=\"_blank\"\u003e\"When are leaf bumpers and push down bumper springs necessary?\"\u003c\/a\u003e blog. Need help? View our \u003ca href=\"https:\/\/ddmgaragedoors.com\/blog\/2018\/06\/22\/how-to-install-push-down-spring-bumpers\/\" target=\"_blank\"\u003eHow to Install Push Down Spring Bumpers\u003c\/a\u003e instructions.\u003cbr\u003e\u003cbr\u003e IMPORTANT: Due to supply chain shortages we currently do not offer quantity discounts, and for some of our products we are limiting the quantities that may be purchased.","brand":"Service Spring","offers":[{"title":"Default Title","offer_id":51161617793344,"sku":"RS-15","price":129.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/0013\/1904\/files\/RS-15.jpg?v=1782855394"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/0013\/1904\/collections\/bumpers.jpg?v=1767901442","url":"https:\/\/shop.ddmgaragedoors.com\/collections\/garage-door-spring-bumpers.oembed","provider":"DDM Garage Doors","version":"1.0","type":"link"}