Twin Disc TA-90-8501, Operator'S Manual

Page: 111 / 152

111
Twin Disc, Incorporated
Troubleshooting
Power Transmission System Operator’s Manual #1020510
Test 9. Converter Stall Torque Speed and Transmission Clutch Check
Test 9 may be used to verify proper operation of the transmission, torque
converter, and engine. Note that the oil well fracturing rig pump will be driven
during this test. If sufficient hydraulic resistance exists on the well, the pump
may not turn, thus stalling the converter. The engine must be running to perform
this test. The test must be entered with the selector in neutral. Once
8th is
selected, DESELECT NEUTRAL will be displayed until the upshift button is
pushed. The transmission will be shifted into 8th range, and the display will
indicate
8th ENGAGED . The transmission will remain engaged until the up
arrow button is pushed or the selector is moved to the neutral position. This
test should only be performed for short periods of time to allow the transmission
system oil temperature to cool sufficiently.
During the operation of test 9, it is necessary to have all personnel and
any obstacles clear of the oil well fracturing rig. If the oil well fracturing
rig pump is not sufficiently loaded, the transmission output speed will
accelerate in 8th range. Operation can be stopped by any of the
following.
q
Selecting N
q
Turning the oil well fracturing rig power off
q
Depressing the up arrow button on the Display
Test 10. Communication Link Tests
This test may be used to confirm the functionality of an externally installed RS232
communication link. This test requires special test harnesses, and is only used
by qualified electronic technicians. Listed selections are
RS232 and EXIT
TEST . If the test is entered, and proper connections are made, the message
will be BAD LINK CONNECT Rx TO Tx or WORKING .