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Brent Dorr Posted on Oct 10, 2017
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Why does the door open about 12 inches and stop? The only way to get it open is to disconnect the door from the drive plate. The chain had a lot of slack in it so I tightened it,that didn't work

Chamberlain 1/2 HP 41A5021-1B

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jmartin50

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  • Contributor 29 Answers
  • Posted on Oct 22, 2017
jmartin50
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This should fix your problem.
https://youtu.be/NxBeX-B5usA

youtube.com

Garage Door Opener not working Only Travels 6 Inches Then Reverses Stops

5 Related Answers

SeanAA

  • 2 Answers
  • Posted on Jul 25, 2008

SOURCE: Chamberlain Liftmaster Professional 1/2 HP

Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.

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Anonymous

  • 244 Answers
  • Posted on Jan 15, 2009

SOURCE: GARAGE DOOR OPENS BUT WILL NOT CLOSE AUTOMATICALLY

is bulb on motor flashing 10 times. then you have electric eye problem. otherwise, sounds like you need to increase down force a hair. adjustement is on logic board, right knob.

ltfrc

Mike Schmidt

  • 227 Answers
  • Posted on May 25, 2009

SOURCE: New Craftsman 95320 1/2 hp chain drive only opens door ~6"

Try this link
http://www.garagedooropeners.us/helpgifs/chamberlain_troubleshooting.html

Anonymous

  • 1 Answer
  • Posted on Jun 12, 2009

SOURCE: Chamberlain Power Drive 1/2 HP - motor runs but does not move chain

I have the same problem with the worm gear shaved. I bought the replacement part and replaced the worm gear. The door did not travel to the full distance between the limit switch. It hit the upoer limit, stopped. When I pressed the remote again, it only reverse for a short distance and never hit the other end of the limit switch. Any hints what the problems are?

Anonymous

  • 43 Answers
  • Posted on Jan 07, 2010

SOURCE: Have a Chamberlain liftmaster professional 1/2

if you can open door Manually- find the FORCE adjustments-Not Travel. These might be "blue" in color. Increase the UP slightly. this adjustment in the cold weather is due to door hardware dry, lube rollers/hinges with wd-40 while door is down, lube every 30 days, keeps it moving quietly...

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0helpful
1answer

Timing jeep cherockee
double posted but this time the CAM pops up.
why not read the FSM first. ? linked below.
or alldata.com . log in and read.

here ill do a paste from JUST install PART chapter.
you are doing ALL THAT book free, REALLY?
https://www.techauthority.com/en-US/Pages/Home.aspx

  1. Using a vise, lightly compress the secondary chain tensioner piston until the piston step is flush with the tensioner body. Using a pin or suitable tool, release ratchet pawl by pulling pawl back against spring force through access hole on side of tensioner.
  2. While continuing to hold pawl back, Push ratchet device to approximately 2 mm from the tensioner body. Install Special Tool 8514 lock pin into hole on front of tensioner. Slowly open vise to transfer piston spring force to lock pin.
  3. Position primary chain tensioner over oil pump and insert bolts into lower two holes on tensioner bracket. Tighten bolts to 250 inch lbs. (28 Nm).
  4. Install right side chain tensioner arm. Install Torx®bolt. Tighten Torx®bolt to 250 inch lbs. (28 Nm). CAUTION The silver bolts retain the guides to the cylinder heads and the black bolts retain the guides to the engine block.
  5. Install the left side chain guide. Tighten the bolts to 250 inch lbs. (28 Nm).
  6. Install left side chain tensioner arm, and Torx®bolt. Tighten Torx®bolt to 250 inch lbs. (28 Nm).
  7. Install the right side chain guide. Tighten the bolts to 250 inch lbs. (28 Nm).
  8. Install both secondary chains onto the idler sprocket. Align two plated links on the secondary chains to be visible through the two lower openings on the idler sprocket (4 o'clock and 8 o'clock). Once the secondary timing chains are installed, position special tool 8429 to hold chains in place for installation.
  9. Align primary chain double plated links with the timing mark at 12 o'clock on the idler sprocket.
  10. Align the primary chain single plated link with the timing mark at 6 o'clock on the crankshaft sprocket.
  11. Lubricate idler shaft and bushings with clean engine oil. NOTE The idler sprocket must be timed to the counterbalance shaft drive gear before the idler sprocket is fully seated.
  12. Install all chains, crankshaft sprocket, and idler sprocket as an assembly . After guiding both secondary chains through the block and cylinder head openings, affix chains with a elastic strap or equivalent. This will maintain tension on chains to aid in installation. Align the timing mark on the idler sprocket gear to the timing mark on the counterbalance shaft drive gear, then seat idler sprocket fully . Before installing idler sprocket bolt, lubricate washer with oil, and tighten idler sprocket assembly retaining bolt to 25 ft. lbs. (34 Nm). NOTE It will be necessary to slightly rotate camshafts for sprocket installation.
  13. Align left camshaft sprocket "L" dot to plated link on chain.
  14. Align right camshaft sprocket "R" dot to plated link on chain. CAUTION Remove excess oil from the camshaft sprocket bolt. Failure to do so can result in over torque of bolt resulting in bolt failure.
  15. Remove Special Tool 8429, then attach both sprockets to camshafts. Remove excess oil from bolts, then Install sprocket bolts, but do not tighten at this time.
  16. Verify that all plated links are aligned with the marks on all sprockets and the "V6" marks on camshaft sprockets are at the 12 o'clock position. CAUTION Ensure the plate between the left secondary chain tensioner and block is correctly installed.
  17. Install both secondary chain tensioners. Tighten bolts to 250 inch lbs. (28 Nm). NOTE Left and right secondary chain tensioners are not common.
  18. Remove all locking pins from tensioners. CAUTION After pulling locking pins out of each tensioner, DO NOT manually extend the tensioner(s) ratchet. Doing so will over tension the chains, resulting in noise and/or high timing chain loads.
  19. Using Special Tool 6958, Spanner with Adaptor Pins 8346, tighten left and right . camshaft sprocket bolts to 90 ft. lbs. (122 Nm).
  20. Rotate engine two full revolutions. Verify timing marks are at the follow locations: ² primary chain idler sprocket dot is at 12 o'clock ² primary chain crankshaft sprocket dot is at 6 o'clock ² secondary chain camshaft sprockets "V6" marks are at 12 o'clock ² counter balancer shaft drive gear dot is aligned to the idler sprocket gear dot.
  21. Lubricate all three chains with engine oil.
  22. After installing all chains, it is recommended that the idler gear end play be checked. The end play must be within mm 0.004-0.010 inches (0.10-0.25). If not within specification, the idler gear must be replaced.
  23. Install timing chain cover and crankshaft damper.
  24. Install cylinder head covers. NOTE Before installing threaded plug in right cylinder head, the plug must be coated with sealant to prevent leaks.
  25. Coat the large threaded access plug with Mopar® Thread Sealant with Teflon, then install into the right cylinder head and tighten to 60 ft. lbs. (81 Nm).
  26. Install the oil fill housing.
  27. Install access plug in left cylinder head.
  28. Install power steering pump.
  29. Fill cooling system.
  30. Connect negative cable to battery.
Read full answer
Dec 07, 2014 • Jeep Cars & Trucks
0helpful
1answer

Garage door moves few inches and stops, springs are fine, sensros are fine.
If it is not blinking when it stops, then the capacitor is blown. Replace the capacitor and it should resolve the problem.
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Aug 09, 2014 • Craftsman Garage Door Opener 1/2 HP Chain...
2helpful
1answer

I have two craftsman door openers. They work great with pushbutton on wall, open and close ok. The door opens fine with remotes ( one handheld other homelink in car ) but will not close with remote. It...
If the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure the lights on the sensors are both on and not flickering. Tweak them if necessary. If you cannot get both lights to come on you have bad sensors or the wiring to them.
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Dec 27, 2010 • Sears Craftsman LiftMaster Chamberlain...
0helpful
1answer

I have a whirlpool electric dryer. There is a chain coming out around the inside of the back area of the dryer. It has come out about 12 inches. What is that part and is it fixable?
ive never heard of a chain drive dryer cept commercial dryers use a chain drive your chain is most likely a safety chain that was once hooked to the wall its perpose was if a child opened the door and leaned or sat on the door the dryer would not tip over they use safety chains on ranges for the same reason hope this helps
Read full answer
Sep 24, 2010 • Whirlpool LER4634J Electric Dryer
0helpful
1answer

It moves up a few in. then stops. Then you push the button again it closes hard aginst the floor. I disconneted the dr andf it still dose the same thing.
The opener has lost track of what is open and closed. This MIGHT be due to damaged gears, but first get a manual and do the initial setup work.

You could disconnect the motor and manually move the carriage back to where is should be, then engage the motor again.

If this is a chain drive, the chain may have slipped cogs until it thinks the door is up when it is only inches up.
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Jan 09, 2010 • Sears Craftsman LiftMaster Chamberlain...
0helpful
1answer

Door won't lift when push button. Makes loud
if this is a chain drive,is the chain so loose that the chain is jumping on the sprocket? this would cause a lot of noise. if this is the problem just tighten the chain.
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Nov 25, 2009 • liftmaster Chamberlain Garage Door Opener...
2helpful
1answer

Have replaced drive gear on Craftsman GDO. Everthing engages and chain moves but door only opens 3 inches are so. Have ajusted opening cointrol on side to max and only 3 inches. When I unlatch GD from...
Loosen the chain enough that you can remove it from the pulley on top of the motor unit. Now with the door closed run the motor until the pulley turns in the clockwise direction and stops. Put the chain back on the pulley and tighten. You may have to tweak the up and down limits now.
Read full answer
Nov 14, 2009 • Sears Craftsman LiftMaster Chamberlain...
0helpful
1answer

New Craftsman 95320 1/2 hp chain drive only opens door ~6"
Try this link
http://www.garagedooropeners.us/helpgifs/chamberlain_troubleshooting.html
Read full answer
May 24, 2009 • Sears Craftsman LiftMaster Chamberlain...
1helpful
1answer

Garage door opener chain out of sync with door
There are two white screws on the sides that adjust the limits. Adjust the "down" screw less. You should have to turn the screw 4 full turns for eight inches. After you make this adjustment, test it without the door being hooked up to prevent damage to the door or opener if it tries to close too far.
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Feb 27, 2009 • liftmaster Chamberlain Garage Door Opener...
0helpful
2answers

Sears opener wont open or close more than 12 inches
You may have put the chain back on out of "sync" with in internal up and down stops. You may have to take the chain off the motor sprocket and run the motor to make sure it is stopped in the down position ( watch the rotation of the sprocket to determine up or down position) When the motor is stopped in the down position put the chain back on with the chain Carriage in the down position. Then you can fine tune the up and down stop positions with the adjustment screws on the side.
Read full answer
Feb 05, 2009 • Sears Craftsman LiftMaster Chamberlain...
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