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4240 slippage

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Adam Conner

12-10-1999 17:26:34




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This spring we noticed that our 4240 (powershift) would slip shifting into 8th gear pulling a 3000 gal. manure tank (full). By the end of the summer it would slip in 5th gear and up with less load. We beleive it could be the non releasable clutch on the flywheel. Is there any way to verify this before splitting the tractor. Are there any pressure check points for the transmission? What kind of job is it splitting the tractor (with cab). Any input would be appreciated. In advance Thanks, Adam

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ronm

12-11-1999 22:57:21




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 Re: 4240 slippage in reply to Adam Conner, 12-10-1999 17:26:34  
Plumb a gauge into the "CLUTCH" test port on the clutch valve housing. Note the pressure, then get the trans. to slip. If the pressure falls off while the trans. is slipping, the dampener disk is slipping. If the pressure holds, the problem is in the trans. Pressure should be about 175 psi at full throttle.



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JDGnut

12-13-1999 22:41:20




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 Re: Re: 4240 slippage in reply to ronm, 12-11-1999 22:57:21  
Hey romn, I forgot about that, the tranny pump is not run off the crank on the powershift...later JDGnut



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JDGnut

12-11-1999 21:58:07




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 Re: 4240 slippage in reply to Adam Conner, 12-10-1999 17:26:34  
Put her on a dyno or a heavy pto implement. On the 8 speed power shifts, the damper in the flywheel was there to potect again large spikes loads from the transmission. The dampner was hooked to everything behind the engine. If the pto starts slowing down and the engine does not,look at the dampner. Sometimes the springs break or the disk just wears and starts to slip... It is not hard to slit the tractor for this.. but if go into the transmission, the cab will have to come off and almost gut the transmission case. Might need to check the clutch pressure too, make up the spring hasn't gottin weak and losing the engagement presure. Good luck..

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david val

12-11-1999 01:52:39




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 Re: 4240 slippage in reply to Adam Conner, 12-10-1999 17:26:34  
there are a few checks you can perform to determain if the slippage is in the damper (dry disk} or in the ps. elements.
smell the oil in the trans. from th oil filler tube, if the oil smells burnt then you probably have a problem in the ps. elements. rhemov the trans. pump suction screen and look for disk fragmannts. if you have them, you hav ps.problem.
if there is no burnt smell in the oil probably the damper is slipping. you can check for burnt smell from the engine rotating hole or from the strter hole.
when you drive the tractor i mid rpm (1500-1800) apply the brakes on every gear.
if you have slippage only on certain gears (not cosequent) then the problem is within the ps. if slippage is consequent and increases in higer geare you have a grneral slippage that can be from the damper or from the ps.(general low pressure).
if you conclude that the slippage is from the damper you have to split the tractor only betwee the engine and clutch housing. if there is oil wetness in the damper area check rear engine oil seal . if in doubt remove clutch pack and relace shaft seal and gaskets.
david

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