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

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Twin Disc, Incorporated
Troubleshooting
Power Transmission System Operator’s Manual #1020510
TRAN SYS FAULT Message -- LOCKUP Log Code -- CIRCUIT
Status Code
This fault message will be displayed if the control detects a short or open circuit
to the torque converter range clutch valve. The valve will be turned off, and the
message displayed. Operation of the oil well fracturing rig will continue, however
the torque converter lockup clutch will not be available. The message will be
displayed until the problem is addressed, and the control power cycled by the
key switch. The circuit can be checked by removing the J4 cable and checking
terminals
J3J1 and J3J2 , If the measured impedance is not proper at these
points, the cable must be disconnected at the sensor, to determine the location
of the fault. The proper coil impedance is 5 to 11 ohms.
TRAN SYS FAULT Message -- NEUTRAL FAULT Log Code
This fault message will be displayed if the neutral disconnect relay switch and
the current gear status are not in agreement. The control will put the system
into computer neutral until the neutral disconnect switch and the current gear
status are in agreement. The fault message will clear from the display, however
will be logged into the control memory.