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

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89
Twin Disc, Incorporated
Troubleshooting
Power Transmission System Operator’s Manual #1020510
SELECT NEUTRAL Fault Message
This fault message will be displayed at any time that the Neutral position of the
selector must be verified for continued operation of the oil well fracturing rig.
The message will be cleared when the switches indicate that Neutral has been
selected.
TRAN OIL FILTER Fault Message -OIL FILT PLUGGED Log Code
This fault message will be displayed if the hydraulic system filter differential
pressure switch indicates a high pressure drop across the filter for more than
30 seconds. The message will be cleared when the switch indicates a normal
pressure drop for at least five seconds. This message will not affect the operation
of the transmission system.
TRAN SYS FAULT Message -- INPT SPD Log Code
This fault message will be displayed if the control recognizes an open or short
in the transmission input speed sensor circuit. The transmission output speed
sensor signal will be used to determine the engagement of the torque converter
lockup clutch, based on the range that the transmission is in. The display
message will not be cleared until the fault is corrected and the controller is
repowered by cycling the key switch. The proper impedance of the sensor when
checked by using an ohmmeter should be 1000 to 1300 ohms. This can be
checked across terminals
J3E1 and J3E2 at the plug when it is removed from
the control. There should be no circuit between either of these terminals and
the chassis ground which is
J4X3 . If the measured impedance is not proper at
these points, the cable must be disconnected at the sensor, and at the
transmission junction to determine the location of the fault.