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

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Twin Disc, Incorporated
Power Shift Transmission System Operator’s Manual #1020510
Preventative Maintenance
Hydraulic System Pressure Checks
At the time of each transmission oil change the main and lube pressure of the
transmission should be checked.
See Figures 3, 4, 5, and 6 in Operation for
pressure test point locations.
Prior to making pressure checks, ensure that the transmission is filled with oil
of the correct type.
Pressures should be measured with gages or instrumentation that
allows the technician to be at a safe distance from the fracturing rig
tires. Gages must be installed while the engine is not running. Pressure
checks are made with the engine running, the transmission in neutral,
and the fracturing rig parking brakes on. No one must be allowed in
front of, nor behind the fracturing rig nor near the fracturing rig tires.
Check main and lube system pressures as follows:
1. Select desired check point and install 0-300 psi (0-2000 kPa) pressure
gauge to check main and clutch apply pressures, and 0-100 psi (0-800
kPa) pressure gauge for lube system.
2. Start the engine, and shift to Warm-Up and bring the engine up to 1500
rpm. Allow the transmission oil to heat to 80° to 100° C.
3. Refer to pressure requirements in Description and Specifications.