Farmall H clutch chatter

510 plows · Oct 7, 2009

A friend of mine has a Farmall H that the clutch chatters when you are letting the pedal out slowly. We dropped the Hyd pump out and replaced the clutch with a new Reman unit, and it does the same thing. We replaced the disk, pressure plate and both bearings.

We have pulled the unit back apart and pulled the input shaft to the transmission out this time and inspected it. Where the yoke attaches to the front of the shaft we found that the bolt and washer were missing and had some play in the woodruft key, Had that repaired and put everything back together and the clutch still chatters when you first start the tractor moving.

I'm not sure where to go next. The clutch is good and solid when the pedal is all the way back, pulls good and does not slip. It just chatters when you first start moving. Thanks much for any help you can give me. charlie

Janicholson · Oct 7, 2009

The only thing not done is to have the flywheel trued (surfaced) this includes setting the step depth PP mount surface to friction surface on FW) to stock dimension so the PP and disk geometry are correct. I would bet there are high spots on the FW surface causing at least some of the chatter. JimN

Dave S. · Oct 7, 2009

The surface where the clutch disc meets the flywheel may not be true and needs resurfaced.

sgtbull · Oct 7, 2009

interesting... but how the heck does a flywheel develop high spots????

Anonymous-0 · Oct 8, 2009

Cast iron can have varying amounts of carbon in it's makeup within a single piece. With repeted heating and cooling the high carbon spots work harden, the rest stays soft. the soft iron wears a lot faster that the hard areas.

510 plows · Oct 8, 2009

When the engine was overhauled 4 years ago. We also did a clutch job including resurfacing the flywheel. The tractor is used for tractor rides parades and other lite duties. A couple years ago the clutch started to chatter, and has been getting worst. The clutch that we removed looks good and I would of reused but we are trying to get rid of the chatter. I"m not sure what to do next. charlie

rustyfarmall · Oct 8, 2009

Maybe the machine shop didn't remove quite enough material when the trued up the flywheel? About the only thing you can do now is to have it resurfaced again, find a different flywheel, or just live with it like most of us do.

mopman00 · Oct 8, 2009

yep back in 73 I bougt a new chevy pickum up with 3 on the tree she chaturd for 3 yers they resufused the flyweel til ther was noten lef. put in newun and I drove her til 93 no truble.

Mich John · Oct 8, 2009

Clutch tuning is a something that the OE manufacturer does to avoid issues such as the engagement chatter you are experiencing. If you look at a clutch disc, between the two facings there is an arbor form (wave washer) whose shape is critical in controlling chatter on engagement (along with the facing material and other variables). If you had the ability to run different discs with varying wave washers, you would probably find one that doesn"t chatter with your particular conditions. It"s probably a good bet that your tractor did NOT have chatter when new so the conditions now (flywheel surface irregularities, clutch friction material, wear {runout}, etc.) are such that chatter is introduced. It may be annoying but unless it"s violent (really shakes the tractor on initial engagement), you can just engage a little quicker and/or live with it as NO real harm will come of it.

Farmall H clutch chatter

510 plows

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Janicholson

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Dave S.

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sgtbull

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Anonymous-0

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510 plows

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rustyfarmall

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mopman00

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Mich John

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