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310a clutch free play

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R. Quenett

10-13-2002 15:34:51




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Hello,

I'm overhauling the engine disconnect clutch on a John Deere 310a backhoe loader. On re-assembly, there doesn't seem to be much, if any, clutch free play. Is this normal for this machine? What should it be? The service manual seems silent on the specifics.

Thanks for any help.




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Jonathan

10-14-2002 14:03:24




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 Re: 310a clutch free play in reply to R. Quenett, 10-13-2002 15:34:51  
You mean free play on the pedal linkage after everything is reassembled?? The point at which the engine clutch is disengaged is at the last few inches of pedal travel after you raise the pedal stop bracket mounted on the clutch pedal. During normal operation the engine clutch stays engaged...If you installed a new pressure plate and/or clutch disc, the fingers on the pressure plate have to be adjusted before putting the tractor halves back together... Did ya check the forward clutch pack sealing rings while you were in that deep ???

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R. Quenett

10-14-2002 17:00:48




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 Re: Re: 310a clutch free play in reply to Jonathan, 10-14-2002 14:03:24  
Thankyou for your reply.

No, not the pedal linkage, the actual disconnect pressure plate finger to throwout bearing free play as detected at the clutch shaft by rotating the clutch fork shaft (part number AT60373) by hand. If I separate the housings by roughly a sixteenth of an inch then there is noticeable bearing to finger free play when rotating the shaft. If I cinch up the housings tight, it becomes hard to detect much, if any, free play remaining. As you say, the clutch itself isn't actually used much during normal service so perhaps this free play is normal for this machine but I wanted to ask because it's not how I'm used to seeing clutches go together on machines without the reverser and I don't see a spec in the service manual.

The clutch disk is new and the pressure plate was overhauled. The shop which overhauled the pressure plate also turned the flywheel and set up the flywheel/clutch assembly (which should include adjusting the fingers) while they had it, or at least they were supposed to.

The forward clutch pack is essentially new from one end to the other, including the sealing rings you ask about. The sleeve which those sealing rings seal against should probably also have been replaced but it would have been necessary to split the clutch housing from the transmission housing to get it out with the puller I had so I did not do that. I'm hoping to get away with stopping the overhaul where I did; gotta stop somewhere... :-)

But the clutch free play worries me.

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Jonathan

10-15-2002 15:33:56




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 Re: Re: Re: 310a clutch free play in reply to R. Quenett, 10-14-2002 17:00:48  
If the machine shop surfaced the flywheel and pressure plate etc...I'll bet they didnt adjust the fingers on the pressure plate... Even new parts arent adjusted out of the box. I'm not sure what the dimension is as there is a JD tool that is used to set the depth of the fingers. If you are friendly with a dealer nearby they may let you borrow it or measure it or trace it onto a manila folder and use that as a gauge.

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R. Quenett

10-15-2002 17:14:59




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 Re: Re: Re: Re: 310a clutch free play in reply to Jonathan, 10-15-2002 15:33:56  
My bet is the fingers, too. I was at the shop earlier today and, after a bit of discussion, they also agreed. They had adjusted them, but not correctly. (Is it just me or are there fewer craftsmen now than there used to be?) Anyway, the upshot of the discussion was that they set the fingers down by an additional 1/4". Even if that's not exactly on spec, it should show up in the free play when I get the machine back together and given how seldom that clutch is actually used I expect it to be ok for quite a while and I'm a _lot_ happier with clutches when there's a reasonable bit of free play in 'em. :-)

I appreciate your comments and also the suggestion about tracing the guage, hadn't thought of that.

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