Case 580SR, Service Manual

Page: 60 / 1068

6 SECTION 17 - TORQUE CONVERTERS
IMPORTANT: to prevent the transmission from
overheating, do not allow the engine to operate at
wide open throttle for more than fifteen seconds.
Z
Allow the transmission oil to cool to 29 °C - 35 °C.
Check the rear hydraulic clutch by repeating previous
steps, but with the power reversing lever in the rear-
ward position. Again, cool the transmission oil by al-
lowing the engine to run at approximately 1000 rpm
for one minute.
Z
The engine speed noted previously (stall speed) for
both the front and rear clutch assemblies should be
within 150 rpm of each other. If the stall speed is not
within these limits, refer to the diagnosis guide for
possible causes.
Z
With the gearshift lever and power reversing lever
in neutral, set the engine speed at 600-800 rpm,
then shift into any gear ratio. If the gears clash, ei-
ther the front or rear hydraulic clutch assembly is
transmitting power, even though the power revers-
ing lever is in neutral.
NOTE: if the unit creeps forward and the gears
clash, the front clutch is at fault. The rear clutch is at
fault if the unit creeps backward. If the unit does not
creep and the gears still clash, use the stabilizers to
raise the rear wheels off the ground, move the power
reversing lever to neutral and shift into first gear.
Check the rear wheels for rotational direction; if the
wheel rotate rearward, then the rear clutch is at fault.
1.7 FAULT FINDING
PROBLEM CAUSE CORRECTION
Low stall speed Hydraulic clutch not releasing
Stator support broken
Defective torque converter
Low engine power Replace the torque converter.
Replace the torque converter.
Replace the torque converter.
Check and correct output.
High stall speed Hydraulic clutch not applying or is
slipping
Low line pressure
Sealing rings on rear input shaft
broken
Defective torque converter Replace.
Check pump output.
Replace the seals.
Replace the torque converter.
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