How do I check and adjust the chain tension? To achieve proper chain tension, you must release the door from the opener before making any adjustments. When the chain is properly adjusted the chain will be  1/2" (for T-Rail) or 1/4 " (for Square Rail) above the base of the rail at its midpoint. If the chain is either too loose or too tight, sprocket noise may result. To prevent SERIOUS INJURY or DEATH from a moving gate or garage door: ALWAYS keep remote controls out of reach of children. NEVER permit children to operate, or play with remote control transmitters. Activate gate or door ONLY when it can be seen clearly, is properly adjusted, and there are no obstructions to door travel. ALWAYS keep gate or garage door in sight until completely closed. NEVER permit anyone to cross path of moving gate or door. Below are the steps for adjusting the chain tension, if needed. Run the opener closed using the door button or remote control. Disconnect the garage door from the garage door opener. 

If you have square rail opener, pull the red manual release rope straight down. If you have a T-rail opener, pull the red manual release rope straight down and then back toward the motor unit. bali furniture for sale in singaporeThis will allow you to open and close the door by hand.sliding garage doors gold coast Chain tension is adjusted using two nuts and a threaded shaft located on the inner trolley. lg french door ice maker removalIf you are inside of the garage looking out, you will find these adjustment nuts on the left-hand side of the rail. external hardwood doors cornwall

Loosen the outer nut (the nut closest to the garage door) until the chain droops below the base of the rail, then loosen the inner nut to allow room for the chain to be tightened.cost of a liftmaster garage door opener To add tension to the chain, tighten the outer nut. velociti door panels for saleWith every turn of the outer nut, the chain will rise slightly. Keep your eye on the midpoint of the rail. When the chain is approximately 1/2" (for T-Rail), or 1/4 " (for Square Rail) above the base of the rail, at its midpoint, tighten the inner nut (the nut closest to the motor) to secure the adjustment. The chain is now properly adjusted. After ANY adjustments are made, the safety reversal system MUST be tested. The door MUST reverse on contact with 1-1/2" high (3.8 cm) object (or 2X4 laid flat) on the floor.

Once you re-engage the door, you may notice some chain droop with the door in the closed position. If the chain returns to the correct position when the door is open, do not re-adjust the chain. Answers others found helpful How do I check and adjust the belt drive tension? How do I adjust the travel and force limits? How to replace the chain on a garage door opener GDO Belt Drive - How to set the tension on the spring trolley nut LiftMaster 71-6023 Chain Tensioner Kit for Model H, J, HJ Installation InstructionsBack to Garage Door Question List There are only a few ways that the chain can be tightened.  an adjustment linked to the chain, or an adjustment to the length of the doorBoth adjustment types should be done with the door closed and disconnected from the opener using the emergency release. Adjustments on the chain are located at or near the master link where the chain engages with the cable (graphic below left).  These usually consist of a bolt with two or

three nuts, one or two for locking (or a nut and lock washer) and one for adjusting.  locking inner nut, and turn the outer nut clockwise to adjust the excess slackDo not over tighten the chain! This will cause premature wear on the chain rollers.  Adjust it tight enough so that the center of the chain sags about 1/2" down from parallel with the track (graphic below The second adjustment is located on the top of the opener body.  common on the Stanley chain drives that utilize the tubular-style track (graphic There is a bolt that is turned clockwise to actually extend the length of the track, thus removing the slack from the chain.  concerning recommended chain slack... don't overtighten the chain!! One thing about this second adjustment style is that, if the body of the opener is mounted in a very rigid fashion and has no "give", the tubular track will bend when you try to make thisSo, you might have to loosen the mounting bolts or make other

adjustments to the mounting assembly to allow the adjustment. Back to Garage Door Question List Available from these sellers. New (6) from $27.50 + $5.49 shipping Chamberlain Liftmaster 41A3473 7' Chain and Cable Assembly The 41A3473 7' Operator Chamberlain Liftmaster Sears Craftsman Chain and Cable AssemblyFor 7' Operators(7' high doors), will not work for 8' operators. Will not work with the following Chamberlain operators: PD752 and PD752D. 7.6 x 6.8 x 0.7 inches 4.4 out of 5 stars #61,572 in Home Improvements (See top 100) #99 in Home Improvement > Building Supplies > Building Materials > Doors > Garage Doors, Openers & Parts > Hardware #13,382 in Home Improvement > Hardware 5 star81%4 star16%1 star3%See all verified purchase reviewsTop Customer ReviewsInstall was pretty clear and straightforward - do remember to ensure chain ...This is working very nicely. Our garage door opener is an old Craftsman ...Loosen up the trolley nuts and you should have an easy time to attach the chain end to the trolleyWorked Perfectly on 21 Year-Old Sears OpenerIt fits and that is all I needed.