How to Fix the Chain on a Stanley Garage Door Opener

Written by kenneth crawford
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Stanley manufactured a limited line of residential garage door openers up until 1997. Finding parts for any of their models is difficult except through obscure online suppliers. Although replacing parts is difficult, you can still perform some maintenance to keep your Stanley operational. Fixing the chain on a Stanley garage door opener is one way to reduce wear on the sprocket and gears. The chain becomes loose over time causing it to "slap" against the rail during operation. Tightening the chain is the only adjustment you can perform on the chain.

Skill level:
Moderately Easy

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Things you need

  • Step ladder
  • 7/16-inch wrench

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  1. 1

    Press the push button on the garage door wall to close the door with the Stanley garage door opener. Once the door closes, set up a step ladder under the motor head and unplug the power cord from the ceiling.

  2. 2

    Set the step ladder near the door arm where it connects to the opener. Find the front pulley the chain loops around. The pulley is inside a piece of C-channel. The C-channel has a threaded rod going through a piece of angle at the front of the opener rail with a securing nut on the other side. This is the chain adjustment locknut.

  3. 3

    Turn the locknut clockwise with a 7/16-inch wrench until the middle of the chain is resting halfway between the top and bottom of the opener rail.

  4. 4

    Reposition the step ladder under the motor head and plug the power cord into the ceiling outlet.

Tips and warnings

  • If necessary, you can purchase a new chain. Disconnect the two master links from the trolley and take the chain to a home improvement centre to purchase one that is the correct length.

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