John Deere 4250 15 spd powershift

Farmerstan91

New User
Hey,

I have a 4250 John Deere with the 15 spd powershift and it doesn't have any forward movement. I have all reverse gears and they work perfect. Forward motion is still nothing. I have rebuilt the entire powershift unit with all new clutches, steels, O-rings on the pistons, just about everything in the clutch packs of the machine. Pressures all test good, my system pressure is a little higher than spec and lube pressure is high but I didn't think that it would effect the shifting, especially since I have reverse. I can hear the clutch elements shifting as you change gears in the cab.

Does anyone have suggestions of what could cause this issue?
 
Looking at a power shift clutch engagement chart the only two elements that are used for forward gears only and not reverse gears are B4 and C3, all other elements are used for both forward and reverse.
 

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