How to Replace the Main Gear in a Garage Door Opener

It’s 6:00 AM and you are leaving for work. You press the  garage door opener installlation wall switch and also listen to a refined hum from your electrical motor but the door failed to removal. If your garage doors springs are intact chances are you garage door openers primary drive equipment has actually fallen short. You can conveniently check your drive gears by disconnecting your garage door opener as well as eliminating the steel cover. The major drive gear is made from a white plastic that generally is the weak link in the opener. Lots of things could cause this gear to stop working. Some causes of wear are:

oGarage door from balance (Springs broke or looking for change).
oChain to tight a.
oOld age.
oExcessive usage or high cycle.
oFactory problem or lack of grease at time of manufacture.

Changing the large white gear is a low cost, quick as well as simple do it on your own repair as long as you have a few easy hand tools and also adhere to the safety and security preventative measures. These gears could be purchased online in a selection of levels of components.

Before you get started it is essential for you to have a checklist of minority simple tools should achieve this job:.
oHalf inch wrench or adjustable wrench or pliers.
o3/8″ Socket or Nut Driver.
o1/4″ Socket or Nut Driver.
o5/16″ Socket or Nut Driver.
oFlat Standard Screwdriver.
o5/32″ Punch or similar.

To avoid feasible SERIOUS INJURY and even DEATH from electrocution, ALWAYS Disconnect the power cord from your garage door from the electrical outlet prior to waging any type of inspection or repair.

Step # 1.
Make sure your garage door opener is unplugged. This action insures that nobody accidentally tries to open up or shut the garage door while you are working with it or you do not inadvertently activate the door while servicing it.

Step # 2.
Detach the door from the external trolley by manually drawing the red detach rope and also manually shut the garage door.

The Garage door MUST be in the fully shut position during all repair services and assessment.

Ensuring that your garage door is closed will certainly guarantee that your door will certainly not drop or make any type of motion that would cause injury or startle you. We advise that once the door is closed that you clamp the door down making use of a vise grasp or clamp above one of the rollers to avoid the door from being opened up from the outside.

Action # 3.
Slow the chain or belts tension by shedding the tension nut on the garage door opener cart. Usually this is nut and can be adjusted with a 1/2 “wrench

.Step # 4. Remove the gear or belt sheave retainer cap. Generally this has a clip on the back if you press in it will certainly launch.

Action # 5.
I constantly advise noting the position of the chain or belt to the sprocket before removing. This can conveniently be performed with white out, tape or any other methods. This action aids assure that your chain or belt gets re-installed in the proper placement and also makes for fast as well as simple referral if required later. Remove the chain or belt from the sprocket and then glide the inner cart to the closed setting till it engages the external trolley. Place loose chain/belt on the end of the rail closest to the gear. I typically duct tape the chain to prevent it from falling to the floor and obtaining all twisted and dirty.

Step # 6.
It is now time to eliminate both end covers and the primary housing. Completion cover are each connected by 3 or 4 1/4″ head screws that can be eliminated with a 1/4″ nut chauffeur or socket. Make sure to disconnect the cable to the circuit card.

Step # 7.
Get rid of the keeping clip and the drive gear for the limitations. Additionally at this time eliminate the restriction switch setting up by squeezing the sides simply below the bracket by the drive equipments. There is no have to disconnect the wires as it is OK to leave this limit setting up hang by the cables. Do not make any type of adjustments to the restriction setting up screws, this will insure that there is very little adjustment needed to the restrictions after you finish your repair and run your garage door opener.

Step # 8.
Now its time to eliminate the RPM sensing unit this can be quickly done by disconnecting the cable harness and eliminate the RPM sensor from the safeguarding tabs.

Step # 9.
Separate the red, blue and white cables from the electric motor. It is important that you keep in mind where these cables go. The same shade cables go to the same terminals on the capacitor red/red and also blue/blue.

Action # 10.
Remove the 4 5/16″ hex head screw’s that hold the motor assembly to the frame of the garage door opener. Make sure to place your hand under the motor prior to removing the last screw to stop the motor from falling. Slide the electric motor assembly off the drive shaft as well as location in a safe place. (Not on top of the ladder for obvious factors).

Step # 11.
Remove the three hex head screws holding the gear setting up to the primary framework making use of a 5/16″ nut chauffeur or outlet. Now it is time to decide if you intend to replace the main equipment only or the entire sprocket or all chain drive designs 1984 to present.

Action # 12.
Miss this step if you are changing the entire gear and sprocket or pulley setting up. If you are mosting likely to replace the drive equipment support the driveshaft on a block of timber and drive the reduced roll pin/Tension pin out with a 5/32″ punch. See picture instance listed below.

Action # 13.
Eliminate and replace the worm gear. In many cases it is not required to change the worm equipment unless it reveals signs of wear. If you desire to change this equipment get rid of the shaft collar with a 1/8″ hex wrench. Please be sure to note the location of each of these components as you dismantle so you could re-install in proper order. When you get your equipment kit, you will certainly locate there are components not utilized in your design this is since these kits are global as well as work with several models of Sears, Craftsman, Wayne Dalton, Master Mechanic, Liftmaster, True Value and also various other brand names of garage doors openers. Only change the components that are used on your garage door opener. Get rid of the 3 nuts that hold the motor to the frame and afterwards eliminate the worm gear. Set up the new worm gear making sure the roll pin is properly sittinged in the new gear. Re-install other elements backwards order. After you finish this setting up I suggest you lube the worm gear so you do not neglect.

Action # 14.
Begin reassembly backwards order. Be sure to thoroughly lube the major drive equipment which grease gets on each and every tooth. Attach the gear and also gear or pulley assembly to the major chassis with the 3 5/16″ head screws. Set up the put together electric motor framework to the framework with the four 5/16″ head screws and reattach the red, blue as well as white cords; now install the limit setting up and also the limit drive equipment making certain they mesh appropriately. You could currently mount the RPM sensing unit and reconnect cords. Set up the metal cover and end panels, make sure to connect in the motherboard and also reconnect image eye as well as switch cables.

Action # 15.
Reconnect the power cable to the opener and also cycle the opener until the gear completes a total clockwise cycle. The cart has to remain in the completely down setting before installing the chain. Currently you could remove the tape from the rail and also reinstall the chain. The chain and also sprocket reference mark should be close to lining up. Tighten up the chain so that the chain is 1/2 “above the base of the rail at omphalos for “T” style rails as well as 1/4″ for square tube rails. Secure the chain tightening lock nut.

Keep in mind when adjusting and testing your garage door electric motor it is very important.
making certain no one is in the course of the moving door.

It is very important to know when examining your garage door opener it is feasible to over cycle the motor.
and also have the electric motor briefly overheat as well as stop operating.
To prevent this shot and also not operate the door opener greater than 10 cycles.
without giving it 5-10 minutes to cool off.

Step # 16.
Now run the opener and examination to see if the door opens to the proper placement as well as near to the correct setting. If you need to make adjustments use the traveling modifications screws to make great changes. I recommend only making small modifications 1/4 turn or less at a time. For recommendation one complete turn of the screw equals approx 2″ of traveling on 1/2 and also 1/4 HP models as well as 3″ on 3/4 HP models.

Step # 17.
When you have your  garage door opener installlation travel adjustment correct it is time to readjust the pressure. This is the pressure that it takes to assure your door opener will certainly operate securely. The first step in this procedure is to inspect the down force. With the door open merely turn on the garage door opener and when the door reaches the half method factor grasp the door from the bottom and also attempt and quit it. If the door is hard to stop or does not stop reduce the down force modification in tiny increments until it reverse upon sensible force. If the door does not close and also the light starts to blink increase the down force adjustment in tiny increments until you can examine the turnaround at half method. Adjusting the force does not ensure that your operator will reverse on 1-1/2″ object at the floor. To find out more on changing the reversal at the floor see your proprietor’s guidebook or call the manufacturer.