Powershift transmission
Original issue: Transmission would not engage when transmission fluid warmed up (180-190F).
Added fluid changed transmission fluid, no effect. Suspected Transmission charge pump. While
waiting for pump and other things, ran dozer until tranmsission rose to about 170F but before
began slipping and/or not wabnting to engage.
Parked dozer. Next day came back to move it to the garage to put in nrew charge pump. Would not
move. Could hear going into gear, drive shaft would stop turning, and dozer would not move. Put
in new charge pump, made no difference. Increasing idle causes motor to load (black smoke). Drive
shaft (in forward) does try to creep a little.
Current pressures:
Drive Shaft: Spins freely in neutral, stops spinning in gear (F or R)
Transmisison Charge Pump: 50-75 psi in neutral, 0 psi engaged
Rear ports:
Lower port (rt side): 0 psi at idle, 300 psi gear engaged
High port (lt side): 250 psi at idle, 350 psi gear engaged
Any new thoughts?
Original issue: Transmission would not engage when transmission fluid warmed up (180-190F).
Added fluid changed transmission fluid, no effect. Suspected Transmission charge pump. While
waiting for pump and other things, ran dozer until tranmsission rose to about 170F but before
began slipping and/or not wabnting to engage.
Parked dozer. Next day came back to move it to the garage to put in nrew charge pump. Would not
move. Could hear going into gear, drive shaft would stop turning, and dozer would not move. Put
in new charge pump, made no difference. Increasing idle causes motor to load (black smoke). Drive
shaft (in forward) does try to creep a little.
Current pressures:
Drive Shaft: Spins freely in neutral, stops spinning in gear (F or R)
Transmisison Charge Pump: 50-75 psi in neutral, 0 psi engaged
Rear ports:
Lower port (rt side): 0 psi at idle, 300 psi gear engaged
High port (lt side): 250 psi at idle, 350 psi gear engaged
Any new thoughts?