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2955 MFWD won't disengage

B

BHeatwole

New User
I'm working on a 2955, just rebuilt transmission, all new bearings, seals, etc. But the fwd won't completely disengage. At the port on the side of the shift cover the pressure is 150 psi. The solenoid is working - pressure is 130 psi at idle with switch in disengaged position, flip the switch pressure drops to 0. With the engine running at about 2000 pressure increases to 145. If I put a pipe wrench on the shaft with about 2-1/2' of leverage I can turn it. Also I tested for internal leakage - pressure difference was 5 psi. Clutch has all new seals, 1 new internal and 1 external splined clutch disc (all the rest were fine just those 2 were worn). Also I added shims behind the low pressure relief valve to try to increase the pressure but it didn't change. Any ideas what could be wrong?
 
I would say either you assembled something wrong or some of the clutch disks or separator disks are warped. The disengagement piston is not able to relieve the spring pressure on the plates. So either the stack height of all the disks is too large or the piston is not stoking correctly.

I have commonly seen the housing that the piston rides in get scored and the piston would not stroke correctly. A lot of the time we had to have the housing machined or replaced.
 
I was beginning to wonder the same thing. Just wanted a second opinion before I took it apart again. One more question - is 130 psi enough to disengage it if everything is smooth and shiny?
 
I was going to add that the spacer is a problem on them but you already covered that. It wears on the end making it too short to release the clutch disks.
 
So it works now. I took it apart and counted the discs and there was one too many of each. I think what happened is somebody updated it - because there's a serial # break after this one was made where they added 1 internal and 1 external disc and made the spacer longer. So when I put it together the first time, I never thought to count the discs and I put the shorter spacer in because according to the SN that's what I needed. So today instead of ordering and waiting for a different spacer I just removed 2 discs and put it back together. So any comments welcome if I'm missing something or did something foolish. But I'm sure glad it was that simple.
 
On the average JD 2955 the one less disk would make little difference. If the owner is going to do heavy loader work or tillage then he MIGHT make the MFWD clutch slip. It is rare for that to happen in the US. They did the update mainly for the European models where they use a front three point hitch more.
 
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