power/mechanical reverser question

bernieinva · Jul 15, 2017

I certainly understand the workings of a clutch but have never had a reverser mechanism apart. Can someone tell me in simple terms how this functions so as to not have to clutch? Clutches plates whether wet or dry eventually wear and have to be replaced. Are there parts in the reverser that wear as well?

Tx Jim · Jul 15, 2017

Yes reverser parts can wear out. I once owned a Kubota with syncro shift reverser that synchronizers wore out from shifting fwd/rev handling rd bales and required splitting tractor to repair. Hyd reverser has wet clutch linings that could also wear out from excessive fwd/rev shifting. My dairyman neighbors JD 5603 with hyd reverser had springs in damper clutch fail requiring a split for damper clutch replacement.

Long story/short story all things used extensively can wear out.

bernieinva · Jul 15, 2017

Thanks Jim. In simple terms how does a reverser work?

JDEM · Jul 15, 2017

I don't know if you are asking about a gear reverser, or a clutched reverser .

420 Deere crawler was available with a simple (and weak) gear reverser that you could NOT shift on the go. Had to use the engine clutch.

440 Deere crawer was available with a mechanical clutched reverser. It had to clutch packs with over-center locking pressure plates. It still had an engine clutch.

1010/350 Deere came with a powershift hydraulic clutched reverser. No engine clutch. Has its own hydraulic pump, a hydraulic control valve, an adjustable shift shock absorber, and two wet clutch packs that run at 120-150 PSI. No engine clutch and shifts can be made under load at full RPM between forward and reverse.

JD Seller · Jul 15, 2017

The majority of them utilize a planetary gear set. Then they have a hydraulic/wet clutch pack on the inner planet carrier and the outer ring gear. So by holding the outer ring gear you would get a reverse action because of the planet gears driving the output shaft. So therefore you have a direction change. Then by locking the planet gears to the input shaft hey then turn the outer ring gear in the same direction as the input shaft.

The reason they last is a wet clutch, that is properly designed, will last many hours being slipped for the short time a direction change happens.

Now with the new IVT and CVT transmissions they have a variable speed hydraulic motor that drives part of a planetary set for the speed selection. So you can just reverse the hydraulic motor and you get a direction change.

power/mechanical reverser question

bernieinva

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Tx Jim

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bernieinva

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JDEM

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JD Seller

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