GROVE Published 10-21-2010, Control# 198-04 7-21
5540F/YB5515 SERVICE MANUAL TRANSMISSION AND TORQUE CONVERTER
Inspection
Inspect the transmission generally for visible means of water
entry into the system.
Disconnect the transmission cooler circuit and clean
thoroughly. The transmission cooler is a possible source of
water contamination and should be tested for possible failure
as follows:
Cooler Test Procedure
1. Remove the cooler from its mounting.
2. Drain remaining oil/water from the cooler.
3. Connect an air supply to the transmission oil inlet
connection and plug and seal the outlet.
4. Submerge the cooler in a tank of water and apply air
pressure to test for leakage. If bubbles are visible the
integrity of the cooler has broken down and the cooler
should be scrapped.
NOTE: Air test pressure should not exceed 6 bar (90 psi).
5. If the cooler is not damaged, it should be cleaned and
dried ready for reassembly onto the transmission.
After refilling the transmission with new oil, and the engine
and transmission have returned to normal working
temperature, the operator should periodically stall the torque
converter for up to 5 second intervals to remove trapped
water. To stall the torque converter, carry out the following
procedure:
Stalling the Torque Converter
1. Apply the foot brake firmly. If necessary, set the machine
against a fixed obstruction.
2. Select 4th speed forward and open the throttle fully.
Flushing Procedure
1. Reconnect the hoses to the cooler. Ensure the joints are
clean and leakproof.
2. Renew the oil filter.
3. Refill the transmission circuit with the recommended
grade of oil.
4. Start the engine and continue running for several
minutes to reach normal operating temperature.
5. Stall the torque converter for 5 seconds.
6. Continue running the engine for 5 minutes.
7. Repeat the torque converter stall for 5 seconds.
8. Continue this procedure for a period for up to 30
minutes, if possible during machine operation.
9. Drain the oil and fit a new filter. Test the oil for
contamination.
10. Refill the transmission circuit with the recommended
grade of oil.
NOTE: If the oil drained at step 9 is clean and free from
water contamination - return the transmission to
service. If not, repeat flush and fill procedure.
General Procedure
Between 50 and 100 hours operating time after cooler
failure, drain the transmission cooler circuit and refill with the
recommended grade of oil and renew the oil filter.
Oil should no longer show evidence of water contamination.
Further sampling should be carried out if in doubt.
CAUTION
The oil could be hot, avoid contact with the skin to prevent
scalds.
CAUTION
DO NOT stall the converter for more than 10 seconds
maximum. If contamination is severe (oil still visibly
emulsified) repeat the drain/fill procedure before returning
the machine to service.
Reference Only
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