Grove Published 11-10-2014, Control # 524-00 7-29
RT880E SERVICE MANUAL POWER TRAIN
Hydraulic Checks
Before checking the transmission/torque converter and
associated hydraulic system for pressures and rate of oil
flow, it is essential that the following preliminary checks be
made.
1. Check oil level in transmission. This should be done with
oil temperature at 180 to 200° F (82 to 93° C). Do not
attempt these checks with cold oil.
2. To bring the oil temperature to this level, it is necessary
to either work the machine or stall out the converter.
When it is impractical to work the machine, stall out the
converter as follows.
a. Apply the parking brake and service brakes.
b. Position the shift lever to forward and high speed.
c. Accelerate the engine to between half and three-
quarter throttle.
d. Stall the converter until desired temperature is
reached.
NOTE: Always make all troubleshooting checks with the
converter outlet temperature at least 180 to 200°F
(82.3 to 93.3°C).
Removal
1. Extend and set the outriggers just enough to take up the
slack in the outrigger pads. Chock the wheels.
2. Position the boom over the side and stop the engine.
3. Remove the engine and transmission/torque converter
from the crane as an assembly. Refer to Engine
Removal, page 7-2.
4. Remove the piston and single section hydraulic pumps
from the transmission/torque converter. Cover all open-
ings. Refer to Hydraulic Pumps, page 2-13 for removal
of the pump.
NOTE: The transmission/torque converter weighs approxi-
mately 990 lb (450 kg) dry.
5. Attach an adequate lifting device to the transmission/
torque converter and take up any slack.
6. Remove the screws and hardened flatwashers securing
the drive plate assembly to the flywheel.
7. Remove the nuts and washers securing the transmis-
sion/torque converter housing to the engine flywheel
housing.
CAUTION
Full throttle stall speeds for an excessive length of time
will overheat the torque converter. Only stall the converter
for 30 seconds and then idle for 15 seconds, repeat as
necessary.
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