Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Model 139.536006 I have a 1988 model and had the same problem as pk5353 after replacing the sprocket assembly/worm drive. It would spin a few seconds and shut off while the limit assembly was no where near the contacts for the upper and lower limits. (I disconnected the chain to remove stress and left the back off so I could watch the limit assembly move back and forth.) My sprocket assembly kit cam with the collar with the two allen screws but I did not install it since my original model did not have it (like pk5353). I replaced the black cap and it appears secure but the motor keeps shutting on and off. Should I try putting the collar on? Any other speculation?

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SOURCE: 25 yr+ old Sears opener runs past lower limit

Update: I remembered that I had a problem with the door reversing too much a while back. It was chattering in the tracks and I could not fix it with lubrication and changing spring tension. So I dialed up the down reversing force. This contributed to the jam-up I had when the lower limit was ignored. If I had a lighter force, it may have at least reversed.

After futzing with it I left it alone for several hours. The motor would hum every few minutes. I was considering cutting power to it overnight. I pressed the remote one more time and the motor ran normally to a limit and stopped. I tested it a few times then reconnected the chain and door. Seems fine now. I suspect an intermitten logic board problem. I'll try lightening up the down force and using it for a while.

Posted on Jan 07, 2009

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Why wont the replaced liftmaster sprocket turn clockwise after replacement?


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Jul 01, 2012 | Sears Craftsman LiftMaster Chamberlain...

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The drive gear has shredded and I need a new one. It is a 1991 Chamberlain 1/2 HP Heavy Duty Model 5000. I cannot find the manual to explain what the part is to replace it.


Hi and welcome to FixYa, I am Kelly

The manual can be found here:
http://homeappliance.manualsonline.com/manuals/mfg/chamberlain/5000.html

This is usually the parts that fail:
http://www.wholesalegaragedoorparts.com/Gear_Kits.htm

PN: 41A2817 For the worm gear drive parts
PN: 41A2827 For the Sprocket and Gear Drive assembly that includes the worm drive.

Chamberlan customer support phone: (800) 528-5880
Thanks for choosing FixYa,
Kelly

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1 Answer

Is there any adjustment for the gear drive sprocket that meshes with the worm drive? my gear is not engaging any more


If your drive gear is not meshing with the worm gear it is because it is worn out. You'll need to replace it post haste. The part number is 41A2817 and is available at Sears or any good door opener service company.

Dec 20, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

It has a code of PO742. It feels like you are


P0742 Torque Converter Clutch Circuit Stuck On

TSB #00-07-30-007A: Whine Noise in Park or Neutral, Service Engine Soon or Service Vehicle Soon Lamp Illuminates (Replace Drive Sprocket Support Bearing) - (Jan 30, 2002)
Subject: Whine Noise In Park Or Neutral, Service Engine Soon or Service Vehicle Soon Lamp Illuminates (Replace Drive Sprocket Support Bearing)

Models:
1999-2000 Buick LeSabre, Park Avenue/Ultra, Regal, Riviera
1999-2000 Chevrolet Lumina, Monte Carlo, Venture
2000 Chevrolet Impala
1999 Oldsmobile Eighty Eight
1999-2000 Oldsmobile Intrigue, Silhouette
1999-2000 Pontiac Bonneville, Grand Prix, Montana with 3.4L, 3.5L or 3.8L Engine (VINs E, H, K, 1 -- RPOs LA1, LX5, L36, L67)
and Hydra-Matic 4T65-E Transaxle/Transmission (RPOs MN3, MN7, M15)

This bulletin is being revised to add the Chevrolet Impala to the models affected. Please discard Corporate Bulletin Number 00-07-30-007 (Section 07 - Transmission/Transaxle).

Condition

Object

62d0613.gif

(1) Transmission ID Location
(2) SRTA Tag Location
(3) Hydra-Matic 4T65-E SRTA Tag
(4) Model Year (9 = 1999)
(5) Control Number
(6) Transmission
(7) Serial Number
(8) Julian Date
(9) Calendar Year (9 = 1999)
(10) Model
(11) Hydra-Matic 4T65-E ID Tag
(12) Model Year (9 = 1999)
(13) Line Built (1 = Line 1; 2 = Line 2; 3 = Line 3; 4 = Line 4)
(14) Transmission
(15) Julian Date
(16) Shift Built (A = First Shift; B = Second Shift; C = Third Shift)
(17) Model
(18) Serial Number in Base Code 31
(19) W = Warren Plant
(20) Hydra-Matic 4T65-E
(21) Model

Some owners of the above models equipped with a Hydra-Matic 4T65-E transaxle with a Julian Date prior to 0045 may comment on a whine noise in PARK and/or NEUTRAL or a Service Engine Soon or Service Vehicle Soon lamp that is illuminated. Upon investigation, a DTC P0741 or P0742 may be found.

Cause:
The above condition may be due to drive sprocket support bearing fluting and/or bearing failure.

Correction:
Replace the drive sprocket support bearing. Inspect the channel plate and drive sprocket for any abnormal wear, Turbine shaft for cut seals and/or nicks, and chain for excessive play due to failed bearings.

Important:
When installing the new bearing, the part number MUST be visible (facing upward). Before installing the drive sprocket, lubricate the bearing assembly with J 36850 assembly lubricant.

Refer to the 4T65-E Unit Repair Section for the installation procedure.

Service Part Information:
Part Number: 24214158
Description: Drive Sprocket Support Bearing


Parts are currently available from GMSPO.


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Hope help with this (remem,ber comment and rated this).

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1 Answer

I just replaced the Gear and sprocket assembly in my craftsman model 139.53635SRT. it opens a few inches but reverses imediately. what can I do?


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1 Answer

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2 Answers

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I have a 1265 and took the cover off (unplug first).
There are screws securing the cover: 2 on each side at top, 2 at either end bottom.
Then I disconnected the chain.
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Then at the bottom of the shaft is the "limit switch assembly" that is clipped into the metal housing. Squeeze the 2 on the outside and it should swing free.
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I am waiting for the part and assume we reverse the order above to reinstall.

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