Twin Disc TA-90-8501, Руководство оператора, Страница: 69 / 152

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Twin Disc, Incorporated
Troubleshooting
Power Transmission System Operator’s Manual #1020510
4. Oil well fracturing rig output driveshaft only moves in some ranges
Possible causes:
Failed Transmission Range Clutch Valve
If the display indicates a D range, and the input driveline rotates, but the
oil well fracturing rig output driveline does not rotate, run Test 8 and
check pressure to the range clutch packs.
If no pressure or abnormally low pressure exists when a clutch is
engaged, then inspect, repair or replace the clutch valve.
Failed Range Clutch
If the range clutch pressures are acceptable when the clutches are
engaged but the drive shaft into the transmission does not stop when
D
is selected, and the output drive line does not rotate, then the range
clutch pack is slipping internally. Dark or burnt oil is confirmation of
clutch damage. Remove the transmission for repair.
If the range clutch pressure is acceptable when engaged, and the drive
shaft into the transmission does stop when
D is selected, and the output
driveline flange does not rotate when disconnected from the oil well
fracturing rig pump, it is possible that a different clutch that should not
be engaged for the selected range is seized causing the transmission
to stall. Remove the transmission to repair.
As additional troubleshooting methods, try other forward ranges by
upshifting with the range selector. This process of elimination will help
to identify a failed clutch pack. Only run these tests with the engine at
idle speed.