Allis Chalmers WD45 Hand Clutch is Slipping

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asked Oct 26, 2016 in Tractors by Razvan Alexa (500 points)
My WD45’s hand clutch is slipping. It will stop slipping if I grab it and pull it back. I’m not sure if it’s slipping, however, there is some forward motion. When I got the tractor, which was 5 whole days ago, the hand clutch grabbed hard. It’s not grabbing now, engagement is smooth and linear, even you pull back the lever without trying to feather it.

Here are some clues about what may have been wrong. I checked the oil through the smaller of the 2 fill plugs. There wasn’t an 8-point socket big enough for the other. These fill plugs have square heads which are at a 45-degree angle on the tractor’s left side behind the hydraulic fill dipstick/plug.

The oil was low so I added oil until it reached the bottom of the thread. I used 6 quarts of 80W90. Since this is a wet clutch, do I need to add a friction additive to the oil? Many gear oils from the auto parts store have limited slip additive. I bought oil from the tractor supply store specifically to get oil without an additive, since I didn’t think it was needed.

The other cause may be abuse. My 6 foot Bushhog runs close to my rear tires. Over rough terrain, which is the only terrain I have, the mower’s rear tire will catch. This puts everything in a bind. This may cause the clutch to slip which will cause it to wear down.

I don’t recall if it slowed down when this happened. However, it can cause a series of sharp jerks, so that the tire lugs catch on the mower. This is not the best thing you can do to a clutch.

Do you have any idea which of those is my problem or how to fix a damaged clutch? Or do I have a return spring break since I must pull back the lever to keep it from slipping?

1 Answer

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answered Oct 26, 2016 by Donny76 (540 points)
Well, if the clutch is not fully engaged, then it will slip. If you grab it and engage it a little more, then it should stay engaged. I’m not familiar with the WD hand clutch, so I can’t say much more than that without taking a look at my service manual.

What I would suggest is checking to see if there are a ball/detent problems which are causing the clutch to not stay engaged. Also, there may be a problem with the mower catching on the tires. This is not good. If it’s a 3pt ***, have you considered getting arm extenders, or a quick hitch which can move the mower back?