Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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How can iput the chain back on my lift master

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Need lot more info. Did youtake it off. Did it fall off> Did you replace gears?

Posted on Dec 30, 2009

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Posted on Jan 02, 2017

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My Lift Master garage door will not close. It makes the closing noise but the door does not slide down. Whcan I talk to to fix this?


Sounds like you have a chain drive garage door opener and you hear a humming sound when you push the wall console. The motor is running but the chain does not move. You need to replace the gear & sprocket assembly.

Jul 06, 2014 | liftmaster Lift Master 377LM 376LM 315 MHz...

Tip

Drive Hub, Spring Pulley & Chain Replacement for Steppers


Video about the Drive Hub Replacement Procedure for Stairmaster Steppers

  • This videocovers replacing the spring pulley, the step chain and the drive hub assembly on the Stairmaster steppers
  • Tools needed:
    • Snap Ring Pliers
    • Tip Kit for Snap Ring Pliers
    • Socket Wrench
    • 7/16" Socket
    • 7/16" Wrench
    • Needle Nose or Standard Pliers
    • Safety Goggles
  • Begin by disconnecting the spring
  • Do this by pulling up on the spring and unhooking the spring from the frame post
  • Next, using the snap ring pliers and proper tips, remove the snap ring from the spring pulley shaft
    **Important: Be sure to wear safety goggles when working with snap rings**
  • Remove and inspect the spring pulley for any flat spots replacing the pulley if necessary
    • Flat spots develop over time and can result in roughness in the pedals
  • On the side that the pulley was just removed, slowly press the pedal down
  • Remove the step chain retainer brackets (if equipped) using the 7/16" wrench, 7/16" socket and socket wrench
  • Once the retainer bracket is removed, the spring can be lifted up over the drive sprocket and disconnected from the chain
    • The spring is opened at one end to allow for maneuvering over the link
  • Using the standard or needle nose pliers, remove the master link attaching the step chain to the pedal arm
    • Place one jaw of the pliers against the open end of the clip (if installed correctly, the open end of the clip is opposite the direction of chain travel) and the other jaw of the pliers against the far side of the nearest rivet coming through the keeper link; and squeeze pliers together
    • This should pop the clip free allowing you to remove it from the master link
    • Next remove the link bar
    • Finally remove the master link disconnecting the chain from the pedal arm
  • Inspect the new step chain making sure all the chain links flex
    • Manufacturer recommends lubricating the step chain with 30W motor oil using a clean rag to remove any excess
  • Attach the new step chain to the pedal arm reversing the steps taken to disconnect the chain
  • Relieve tension on the opposite spring by lifting up on the spring and unhooking it from the frame post
  • Slowly press the pedal down
  • Feed the spring around the pulley and lift the chain up over the sprocket to move it out of the way
  • Disconnect the remaining two bolts from the drive hub assembly
  • Lift the drive chain over the sprocket and pull the drive hub from the frame
    • As the drive hub assembly starts to develop problems, you may feel clicking, hear some grinding sounds, or a pedal may stick in one position (which usually happens on one side); All of which are indicators of a worn drive hub assembly
    • The drive hub can be replaced as a complete unit
      • The drive hub consists of (3) sprockets
        • Two one way clutch sprockets that drive in one direction and slip in the opposite direction which are for the step chains
        • A larger sprocket that spins either direction and is for the drive chain
    • An inspection of the drive hub can help determine need for replacement
          • If either of the one way clutch sprockets slip in both directions, they need replaced
          • If there is a catch in any of the sprockets in any position, then it likely needs replaced
  • Reinstall the drive hub the same way it was removed
  • Slip the drive chain over the drive sprocket before mounting the hub assembly to the frame
    • The drive hub assembly on the SC916 stepper only has 4 bolt positions. The drive hub assembly on the 4400 and 4600 steppers has bolt holes all around the hub allowing the hub to be rotated for chain tension adjustment. The SC916 stepper has a preset tension and the adjustment is no longer necessary
  • Once the drive hub is bolted to the frame, reinstall the step chains on each side
  • Place the free end of the step chain (opposite the pedal arm connection) up over the step chain sprocket
  • Lift up on the pedal and pull down on the step chain
  • Place a hand on the sprocket keeping the step chain from feeding back and allowing the pedal to drop
  • Grab the spring with your opposite hand and join the spring to the step chain
  • Once the spring is attached to the chain, press the pedal down again
  • Reinstall the spring pulley and the snap ring onto the pulley shaft
  • Lift up on the pedal and pull the spring to route through the pulley, hooking the spring onto its frame post
  • Repeat these steps to attach the step chain and spring on the opposite side
  • Reinstall the step chain brackets (if equipped) making sure all bolts face the same direction
  • This concludes the video demonstration of replacing the drive hub, spring pulley and chains on the Stairmaster steppers

Spring Pulley Chain Drive Hub Replacement Video for Stairmaster Stepper...

on Feb 25, 2015 | Stairmaster Exercise & Fitness

1 Answer

I have Chamberlain 1160 Lift-Master farage opener. Currently the trolley stuck in the upped position agains the bolt and does not go back. When I try to close the door, the motor is humming twice, then...


Loosen the chain to remove the strain from it and run the motor until the door closes. While the door is closed locate the 'up limit' on the side of the motor unit and turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Now you can tighten the chain.

Oct 25, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Chamberlain Lift Master Pro Formula 1 only makes click sound


Is the door stuck in the open position? If so the trolley is probably jammed against the bolt just in front of the motor unit. Loosen the chain enough to free the trolley and then run the opener until the door is closed. While the door is closed locate the 'up limit' on the side of the motor unit and turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Apr 03, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Bike is a 2005crf250x. Need timing chain slack.


Lift the chain with one finger then turn the crankshaft several full turns by hand. Inspect the full length of the chain during rotation. Any obvious damage? Does the chain revolve smoothly around your finger? If all seems okay then the problem is probably not in the lower end. Some chains are continuous and do not have a master link. Some do have a master link. If you have a master link then separate the chain by removing the link then place both ends of the chain onto the cam sprocket and reconnect the link. If you have a continuous chain I would need to see first hand what is going on. In any event, be certain the timing marks on the flywheel and overhead cam are correctly lined up during installation.

Feb 26, 2009 | 2005 Honda CRF 250 X

1 Answer

Light-master garage door opener - re-engaging the motor after dis


The chain and bracket should automatically engage the door's bracket just use the remote as normal,

Feb 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Lift-master chain drive garage door stuck at the protection bolt


you will have to find were the chain is binding look around the drive sprocket and check the chain to see if it is tight at the bottom or top this will tell you were to start looking for the problem.

Sep 19, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Running ruff


Hi there ace,

There are several possible causes
  • Vacuum leak. Check hoses and connections for a hissing sound.
  • The EGR valve may be leaking
  • The PCV valve may be plugged
  • Air filter may be clogged
  • Fuel pump not delivering sufficient quantity
  • Timing chain stretched/Worn timing gears
All are easily checked. You'll need a timing light for the timing chain check. A can of Carb Cleaner for the valves.

Get back to me with what you find out. We can take it from there. Good luck Ace

Mike

Aug 03, 2008 | 1994 GMC Safari

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