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Allis Chalmers Discussion Forum

clutch adjustment,model B

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ray g.

04-03-2008 15:58:47

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is the clutch (freeplay) adjustable on a model B ? on depression of the petal the driveline will disingauge(spelling?);yet when i go to place it in gear,(any gear)it will grind real bad. i start the tractor engine with the clutch pressed in,in the gear i want to use.....are the gears syncrowed at all.any ideas on a simple (lol) fix??? thanks

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Dick L

04-04-2008 11:24:03

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 Re: clutch adjustment,model B in reply to ray g., 04-03-2008 15:58:47  
It you have an inch or more movement on the clutch pedal before you can feel the pressure plate springs it needs to have a bearing adjustment. This adjustment can only be done with the transmission split away from the torque tube. There is a cover over the adjustment nut. That nut is staked and after the adjustment is made it will need re staked. This shaft runs on tapered bearings and when you have wear they become loose and causes free wheeling of the shaft and gears. It needs to be tight enough that it has some drag. If you get it to tight it will cause bearing failure.

A tight pilot bearing on the drive shaft can also cause this gear grinding problem as well. Not as likely but can happen.

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04-03-2008 18:17:43

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 Re: clutch adjustment,model B in reply to ray g., 04-03-2008 15:58:47  
gears are not syncro. you might have to throttle down in speed to shift gear. might have to wait 5-10 seconds to put into gear. if there is gear lube in the trans instead of lilght weight oil, it will drag... that being said, you can pull the cotter pin on the clutch rod at the pedal, and screw the rod out 3-4 turns and reinstall in teh pedal. dont go any more than about 5 threads or it might fall off inside.

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04-03-2008 16:24:38

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 Re: clutch adjustment,model B in reply to ray g., 04-03-2008 15:58:47  
Sounds like you need to adjust the linkage for proper free play- you are not disengaging the clutch enough to stop gear/shaft rotation. All clutch linkages are adjustable on one end or the other. I don"t have a Model B, but adjustment should be in either the operator manual or AC-11 in the I&T manual, for recommended free play.

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