D6C clutch problems

Pump pressure should be 315 psi min, 350 +/- 10 psi max
Same pressure for speed clutch.
Direction clutch should be 55 +/- 8 psi less than speed clutch.

Pump pressure should be 315 psi min, 350 +/- 10 psi max
Same pressure for speed clutch.
Direction clutch should be 55 +/- 8 psi less than speed clutch.

Hi Team,
suggest check operators platform mountings, seat mountings etc for tightness and the trans selector linkages for worn lever shafts/bushings in the trans case itself along with the correct adjustment and wear in the rose/ball joints of the rods.
If the platform etc is loose or slightly so it can move with the steep angle change and so alter the trans selector linkage adjustment positions causing what you see.
Personally know of a customers 769 truck that developed a loose platform, it downshifted itself (3rd to 1st) unexpectedly whilst going downhill and blew its engine from over speeding.
Cheers,
Eddie B.

[quote="Old Magnet"]Pump pressure should be 315 psi min, 350 +/- 10 psi max
Same pressure for speed clutch.
Direction clutch should be 55 +/- 8 psi less than speed clutch.[/quote]




Thanks Old Magnet for the information. Upon further investigation while preparing to check pressures at the directional control I had the top off of the transmission and started the unit up I noticed it was spraying out oil in the right hand corner of the control valve while still in neautral also noticed oil needed to be changed it looked like black kerosene. This morning I did do a quick check I locked both brakes and was able stall the torque converter in all three ranges forward and reverse. When it comes up to running temperature I can no longer stall the torque converter in all three ranges forward and reverse. I’m going to change the fluid with TO4 30W and new filter and then proceed with pressure test.

Seems there is a problem with leakage on the #1 (forward) clutch.

25 gal of Cat TO4 30w fluid cured the old Girls ailments. One more reason to use Cat spec parts

Thanks Old Magnet & Edb

Sounds to easy. LOL. Did you run the pressure checks?

315-360 speed control

260-300 directional control

Pressure test was performed after 1 hr of operation, Torque convo temp midway in normal range

Hi Boaz63,
thanks for returning to give us your findings and test results--helps others in future with similar problems--if only they could all be so easy to remedy.
Cheers,
Eddie B.