A1 Garage Doors

It’s 6:00 AM and you are leaving for work. You push the garage door opener wall switch as well as hear a subtle hum from your electric motor, however, the door failed to relocate. If your A1 Garage Doors springtimes are intact chances are you garage door openers major drive gear has actually fallen short. You could quickly examine your drive gears by disconnecting your garage door opener as well as getting rid of the steel cover. The primary drive equipment is made of a white plastic that typically is the weak spot in the opener. Numerous points can trigger this gear to fail. Some sources of wear are:

garage door out of equilibrium (Springs broke or in need of adjustment).

chain to limited a.

old age.

excessive use or high cycle.

olfactory defect or absence of oil at a time of manufacture.

Changing the big white gear is an affordable, quick and simple do it on your own repair as long as you have a few simple hand devices and also comply with the safety preventative measures. These gears can be bought online in a variety of degrees of parts.

Prior to you start it is necessary for you to have a list of the few simple tools should complete this project:.


half inch wrench or flexible wrench or pliers.

3/8″ Socket or Nut Chauffeur.

1/4″ Socket or Nut Chauffeur.

5/16″ Socket or Nut Vehicle driver.

last Standard Screwdriver.

o5/32″ Strike or comparable.


To avoid feasible SIGNIFICANT INJURY or perhaps FATALITY from electrocution, ALWAYS Disconnect the power cord from your garage door from the outlet prior to waging any assessment or repair work.

Action # 1.

See to it your garage door opener is unplugged. This step guarantees that no person unintentionally tries to open up or shut the garage door while you are dealing with it or you do not unintentionally activate the door while servicing it.

Action # 2.

Separate the door from the outer trolley by manually drawing the red disconnect rope as well as manually shut the garage door.


The Garage door NECESSITY remains in the completely shut setting during all repair services and assessment.

Guaranteeing that your garage door is closed will assure that your door will certainly not fall or make any type of activity that would trigger injury or startle you. We suggest that when the door is closed that you clamp the door down utilizing a vice grasp or clamp over among the rollers to avoid the door from being opened from the outside.

Step # 3.

Slow the chain or belts stress by shedding the tension nut on the garage door opener trolley. Commonly this is not and can be changed with a 1/2 “wrench

Action # 4. Get rid of the gear or belt wheel retainer cap. Usually, this has a clip on the back if you press it will release.

Step # 5.

I always suggest making the setting of the chain or belt to the gear prior to eliminating. This can conveniently be finished with white out, tape or other methods. This action helps ensure that your chain or belt gets reinstalled in the appropriate place as well as produces fast and easy recommendation if required later on. Get rid of the chain or belt from the sprocket and then slide the inner trolley to the closed placement until it involves the outer cart. Location loosened chain/belt on the end of the rail closest to the sprocket. I typically duct tape the chain to avoid it from falling to the floor and also obtaining all twisted and dirty.

Step # 6.

It is now time to eliminate both finish covers and the primary housing. The end cover is each connected by 3 or 4 1/4″ head screws that can be gotten rid of with a 1/4″ nut vehicle driver or outlet. Be sure to disconnect the cord to the motherboard.

Step # 7.

Remove the keeping clip as well as the drive gear for the limits. Additionally right now get rid of the limit button setting up by squeezing the sides simply listed below the bracket by the drive gears. There is no need to disconnect the wires as it is OKAY to leave this limitation setting up hanging by the wires. Do not make any adjustments to the limit setting up screws, this will guarantee that there is minimal change had to the limits after you complete your repair and also run your garage door opener.

Step # 8.

Currently, it’s time to eliminate the RPM sensor this can be conveniently done by unplugging the wire harness and eliminate the RPM sensor from the securing tabs.

Action # 9.

Disconnect the red, blue as well as white wires from the electric motor. It is necessary that you keep in mind where these wires go. The very same shade cables most likely to the same terminals on the capacitor red/red and blue/blue.

Step # 10.

Remove the 4 5/16″ Hex head screw’s that hold the motor assembly to the structure of the garage door opener. Make sure to put your hand under the motor prior to getting rid of the last screw to avoid the electric motor from falling. Glide the electric motor assembly of the drive shaft and also place in a refuge. (Not on top of the ladder for evident reasons).

Action # 11.

Get rid of the three hex head screws holding the gear assembly to the main framework utilizing a 5/16″ nut chauffeur or outlet. Now it is time to choose if you want to replace the major gear only or the whole gear or all chain drive versions 1984 to present.

Action # 12.

Miss this step if you are replacing the whole gear as well as gear or wheel assembly. If you are going to change the drive equipment support the drive shaft on a block of timber and also own the lower roll pin/Tension pin out with a 5/32″ punch. See photo instance listed below.

Action # 13.

Get rid of as well as change the worm equipment. Most of the times it is not necessary to change the worm equipment unless it reveals indications of wear. If you wish to change this equipment get rid of the shaft collar with a 1/8″ Hex wrench. Please be sure to note the place of each of these components as you take apart so you could reinstall in the correct order. When you receive your equipment set, you will certainly locate there are components not used in your design this is since these packages are universal and deal with numerous versions of Sears, Artisan, Wayne Dalton, Master Mechanic, Liftmaster, True Value and also various other brand names of garage doors openers. Only change the parts that are made use of on your garage door opener. Remove the 3 nuts that hold the motor to the frame and afterward get rid of the worm gear. Mount the brand-new worm gear making certain the roll pin is appropriately sitting in the new equipment. Reinstall other parts in reverse order. After you finish this assembly I advise you lube the worm gear so you do not fail to remember.

Step # 14.

Begin reassembly in reverse order. Make certain to thoroughly lube the primary drive equipment and that grease gets on every single tooth. Affix the equipment as well as sprocket or sheave setting up to the main chassis with the three 5/16″ head screws. Set up the put together motor structure to the chassis with the four 5/16″ head screws as well as reattach the red, blue as well as white wires; now mount the limit setting up as well as the limit drive gear making certain they harmonize appropriately. You can currently install the RPM sensing unit as well as reconnect cords. Install the steel cover and also end panels, make sure to connect to the circuit board as well as reconnect photo eye and also push button cables.

Action # 15.

Reconnect the power cord to the opener and cycle the opener until the gear completes a total clockwise cycle. The cart has to be in the fully down setting prior to mounting the chain. Currently, you could get rid of the tape from the rail and reinstall the chain. The chain, as well as sprocket reference mark, need to be close to aligning. Tighten up the chain to ensure that the chain is 1/2 “over the base of the rail at omphalos for “T” design rails as well as 1/4″ for square tube rails. Protect the chain tightening lock nut.


Note when changing and testing your garage door electric motor it is very important.

making certain no person remains in the path of the removals door.


It is necessary to understand when evaluating your garage door opener it is possible to over cycle the electric motor.

and have the electric motor momentarily get too hot as well as stop operating.

To prevent this try and also not run the door opener greater than 10 cycles.

without giving it 5-10 mins to cool down.

Step # 16.

Currently, run the opener as well as an examination to see if the door opens up to the appropriate placement and also near to the appropriate setting. If you need to make changes make use of the travel changes screws to make great modifications. I advise only making mild adjustments 1/4 turn or less at a time. For reference, one full turn of the screw equals approx 2″ of traveling on 1/2 and 1/4 HP versions as well as 3″ on 3/4 HP designs.

Action # 17.

Once you have your doors travel modification fix it is time to adjust the force. This is the pressure that it requires guaranteeing your door opener will certainly operate safely. The primary step in this procedure is to check the down pressure. With the door open just trigger the garage door opener and when the door gets to the half method factor understand the door from all-time low and also try and stop it. If the door is difficult to quit or does not quite decrease the down pressure adjustment in tiny increments up until it reverse upon sensible pressure. If the door does not close and also the light starts to blink increase the down force adjustment in little increments until you could check the turnaround at half method. Changing the force does not guarantee that your driver will reverse on 1-1/2″ item at the flooring. For more information on readjusting the reversal at the flooring see your owner’s manual or call the maker.