CAT D6H FLUID PROBLEM

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CAT D6H FLUID PROBLEM

D6H 4RC TRACTOR AT COLD TEMP RUNS GOOD AFTER 20 MINUTES LOOSES POWER DOESNT SHIFT IVE ALREADY PULLED DOWN THE TRANSMISSION AND CONVERTER THEY´R OK HAD NO IDEA OF WHAT COULD CAUSE THAT CAN SOMEONE HELP

nakedape1

direct drive or powershift ?
power loss is only in the powertrain ?
do you still have good hydraulic power when you lose powertrain?
torque outlet pressure should be 60 psi +/-10 psi in 3rd fwd stall , is it ?
are the transmission pressures consistant in all speeds and direction combinations {note direction will be approx 50 psi lower than speed pressures } ? if not you may have a bad clutch seal ,
have you checked the engine boost when under load ?
hope this helps , let us all know if it does and any more help , please give full serial # and i will try to find more info

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