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post #1 of 37 Old 02-19-2016, 10:08 PM Thread Starter
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Drive slipping?

I have an older Craftsman II 8/25 model 536.886800 in my garage this week. While going through all the controls, I noticed there wasn't much power to the wheels. I can engage the drive wheels, hold it back, and the usually the tires can turn, breaking traction even on bare pavement. Most other machines the tires will spin even on bare pavement if you hold the machine back with the drive engaged. I checked the friction disk. It had a bit of glazing so I held some sandpaper to the rubber and spun the wheels to get down to fresh rubber again. There was still plenty of rubber left on the disk. Then I took some steel wool to the friction plate and got that all shiny again. No oil or grease on the disk. The drive belt is tight and in decent shape. Idler pulley is keeping good tension on the belt. Is this common for some machines to not have the same amount of power to the ground as others?
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post #2 of 37 Old 02-19-2016, 10:12 PM
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Check your belts and drive disc.

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post #3 of 37 Old 02-19-2016, 10:36 PM
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Take a look at the driven gear (#57) and how it meshes with the axle gear......
MOTOR MOUNT ASSEMBLY REPAIR PARTS Diagram & Parts List for Model 536886800 Craftsman-Parts All-Products-Parts | SearsPartsDirect


Does it look in good shape? If so, then look at the bearings on the shaft ends of the driven gear and see if they are shot......




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post #4 of 37 Old 02-19-2016, 10:50 PM Thread Starter
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Bearings are surprisingly good. The gears mesh well with nothing abnormal underneath. Everything actually turns rather smoothly. I did have to work on the speed selector mechanism to make it work freely, but that's working like a champ now. With the engine off and drive clutch engaged, the tires will not turn and there is no slippage. I'm starting to question the drive belt as its next most likely culprit.
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post #5 of 37 Old 01-23-2017, 11:31 PM
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I'm having the exact same issue with an older Craftsman; did you ever find a resolution?
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post #6 of 37 Old 01-25-2017, 09:48 AM
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Quote:
Originally Posted by Curtis328 View Post
I'm having the exact same issue with an older Craftsman; did you ever find a resolution?

Different model but similar issue. Check the obvious: belts for glazing and dimensions, tension, pulley build-up, friction wheel and disc. Now also check both bushings on the friction disc shaft. Seem them wear and the disc will move when drive is engaged and loses power to the wheels.
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post #7 of 37 Old 01-28-2017, 01:28 AM
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Quote:
Originally Posted by HCBPH View Post
Different model but similar issue. Check the obvious: belts for glazing and dimensions, tension, pulley build-up, friction wheel and disc. Now also check both bushings on the friction disc shaft. Seem them wear and the disc will move when drive is engaged and loses power to the wheels.
Thanks for your excellent input!

- Installed brand new drive belt (properly-sized) one week ago

- Belt has adequate tension, and does not slip when the wheels stop moving

- Drive engagement cable is adjusted as tight as possible

- Installed brand new friction wheel one week ago

- Friction disc has been cleaned with isopropyl alcohol, and does not have excessive play in its bearing

- Replaced both friction wheel shaft bushings today, as the one on the left (driver's) side was badly worn. Shaft is nice and tight now.

- Need to figure out a (safe) way to lock the axle shaft from rotating, with the machine on jack stands, to see exactly where the power is being lost
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post #8 of 37 Old 01-28-2017, 01:34 AM
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Quote:
Originally Posted by HCBPH View Post
Different model but similar issue. Check the obvious: belts for glazing and dimensions, tension, pulley build-up, friction wheel and disc. Now also check both bushings on the friction disc shaft. Seem them wear and the disc will move when drive is engaged and loses power to the wheels.
When you say "pulley build-up", are you referring to worn belt material bonded to the groove in the pulley?
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post #9 of 37 Old 01-28-2017, 02:46 AM
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Garage
I would remove the bottom belly pan, move the machine to the edge of a building or a fence post that will not move when forced upon, carefully Engage The Drive lever with engine running at low rpms and see where the power is being lost. From all the work that you've done so far... I'm guessing there's not enough tension on the friction wheel to the friction plate, or something else is worn on the friction wheel assembly allowing it to not have enough tension. Sometimes brand new friction discs have to be sanded or ground in the center because there is a high spot which allows slippage when it is engaged against the friction plate, even though it is brand new it still slips. Please let us know what you find.

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post #10 of 37 Old 01-28-2017, 08:56 AM
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Quote:
Originally Posted by Curtis328 View Post
When you say "pulley build-up", are you referring to worn belt material bonded to the groove in the pulley?

Yes. If the belt is not staying snug against the pulley and is slipping, belt material can be left on the inside of the pulley causing it to slip worse. Brake cleaner and a wire brush does well on removing that buildup, but be careful as brake cleaner can remove paint.
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