2550 gst clutch

[Tdi pilot]

I have a 1990 2550 GST 2500hrs on it.started to lose power in the higher gears from 5 to 8 felt like clutch slipping a few years ago, At that point I took apart the main dry clutch and everything was within spec i didnÂ’t have time to get inside to the wet clutch as the lower four years were working I let it be.now itÂ’s starting to slip in the lower gears so I figured it was either a worn wet clutch pack or the O-ring around the piston for the pack, The piston O-ring looks fine seals nice and snug.those two little outer seals on the back side also are within specs.The only thing I could find was the two outer steel and fiber plates were worn to a slight conical shape but the fiber plate plate was not completely worn out,just worn on the outside edge And are within spec.has anybody seen this as being the problem for the tractor not moving(other than on a downgrade )In gears 5-8,moving but slipping under load in gears
1-4
Any input on this would be much appreciated

 

[North Idaho Wolfman]

If the plates are not perfectly flat then they are damaged, as are the clutch plates from the sound of the odd wear.

You need to pull the entire clutch piston apart as there is another hidden seal that if damaged will cause issues.

How did you test the main (mechanical) clutch?

 

[Tdi pilot]

Thanks for the reply
Yes I have pulled the piston out of the clutch hub and the big flat shape o ring is fine as is the inner o ring and the 2 seal rings are within spect,all will be replaced before it’s put back together,I removed the dry clutch visually inspected clutch disk and pressure plate for glazing and looks fine and it was all within spect,no slippage in pto.
Back to the wet clutch the outer fiber plate closest to the thick steel plate is worn from the outer edge to half the plate thickness(although still mics out within spec)and the thick steel plate is worn in at the same arc.I’m pretty sure it’s the source of slippage.when I put the two together and turn them there’s no drag like when I put one of the good fiber plates together with one of the good steel plates and turn them you can feel the drag as it should be.
I heard this clutch plates are hard to find do you know a place that has them also I can’t find a part number for the gasket Mid case to transmission

 

[North Idaho Wolfman]

Clutch disks (need 4) P/N 32420-67320

Steel plates (need 4) P/N 32420-67320

Steel plate (need 1) P/N 32420-67320

Complete Clutch pack P/N 32420-99750

Clutch housing (what we normally call transmission) to mid gasket
P/N 32420-67030

Mid to transmission (what we normally call the rear axle housing or differential)
P/N 35340-14140

All the parts are showing out of stock, but I don't see any notes on discontinued.

If individual parts are discontinued, there is still a chance that the whole assembly is available.

Other option is to check with a local clutch repair / reline shop.