Advice on a 4020 with a slipping PTO

ceb5 · Sep 8, 2014

I replaced the clutch on a 71 model 4020 last year with the
synchro shift trans. Had the flywheel refaced and used the JD tool when installing the pressure plate. He has only used it with a square bale baler and a 14' bush hog. It has a 2 stage clutch and the main clutch is holding fine but the PTO clutch is slipping so bad the bush hog will almost stop spinning. There is a inch of freeplay in the clutch pedal,is there anything else I can check to put him back to work? This is a 90 something HP tractor and I would have thought it would not have had any problem pulling a 14' bush hog.

tim s · Sep 8, 2014

The pedal free travel has nothing to do with the PTO,,the PTO is hydraulically activated, 2 small pistons, or cylinders push on the PTO bearing then push on the 3 PTO fingers, the pressure could be low, the clutch could be out of adjustment,, the clutch could be worn out...

Tx Jim · Sep 8, 2014

Pto clutch on a '71 4020 is hydraulically actuated by a valve under the dash. I'd suggest to check linkage to be sure it tight.

Tx Jim · Sep 8, 2014

Tx Jim · Sep 8, 2014

(quoted from post at 14:46:46 09/08/14) I replaced the clutch on a 71 model 4020 last year with the
synchro shift trans. /quote]

Correction: '71 was not the last year for syncro-range trans in a 4020. '72 3020/4020 also had SR transmisions

Tx Jim · Sep 8, 2014

nt double mistake

D- · Sep 8, 2014

Old timers again? He said he replaced the clutch last year not it was the last year of production.

D- · Sep 8, 2014

Or did he?

D- · Sep 8, 2014

Any oil leaking in clutch housing?
They were bad about that.

Another point.... that is not a two stage clutch.
Two stage clutch was when the pto and tran clutches were operated by the same pedal at different stages of travel.

Tx Jim · Sep 9, 2014

(quoted from post at 19:37:16 09/08/14) Old timers again? He said he replaced the clutch last year not it was the last year of production.

D-
MY reading comprehension is getting worse in my old age:lol:

ceb5 · Sep 9, 2014

(quoted from post at 16:43:06 09/08/14) Any oil leaking in clutch housing?
They were bad about that.

Another point.... that is not a two stage clutch.
Two stage clutch was when the pto and tran clutches were operated by the same pedal at different stages of travel.

This tractor has a two stage clutch, I am the one who bought it and installed it for him last year. The very top inch of of the clutch pedal travel engages the PTO clutch. I am looking for any reasons why this clutch is slipping already.

ceb5 · Sep 9, 2014

(quoted from post at 16:37:16 09/08/14) Old timers again? He said he replaced the clutch last year not it was the last year of production.

Where did someone get the idea that I said it was the last year of production?

MikeJM · Sep 9, 2014

(quoted from post at 14:38:24 09/09/14)
This tractor has a two stage clutch, I am the one who bought it and installed it for him last year. The very top inch of of the clutch pedal travel engages the PTO clutch. I am looking for any reasons why this clutch is slipping already.

That defies how they actually work, there are two sections to the clutch, trans and pto, there should be 6 fingers on the pressure plate, 3 for each. The trans drive fingers are push to release and sit in a smaller circle from the PTO fingers. The PTO fingers are push to apply.

The pressure plate you put in had 6 fingers on it?

When you say the top inch engages the PTO, is that when you push down or release the pedal?

I'd follow tim s and Tx Jim's advice, they are on the right track.

ceb5 · Sep 9, 2014

I was thinking of a different tractor with the way the PTO is engaged. On this JD it has a piston that is part of the throw out bearing that does it, hydraulic as Tim mentioned. Does anyone know of anything I can check on this before splitting it and replacing the clutch?

Tx Jim · Sep 9, 2014

(quoted from post at 09:41:03 09/09/14)

(quoted from post at 16:37:16 09/08/14) Old timers again? He said he replaced the clutch last year not it was the last year of production.

Click to expand...

Where did someone get the idea that I said it was the last year of production?

IT's my fault. Failure to comprehend what I read. Never fear if you live long enough you'll get OLD LIKE ME.

D- · Sep 9, 2014

The pto is engaged by two pistons not one.
I asked you if you were getting oil into the bell housing,

Hustler1 · Dec 12, 2018

How do you check pressure? what is pressure supposed to be? Thanks

Advice on a 4020 with a slipping PTO

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