70
Twin Disc, Incorporated
Troubleshooting
Power Transmission System Operator’s Manual #1020510
5.
Oil well fracturing rig will not properly drive the pump in the upper
transmission ranges when the pumping load should allow
operation in these ranges.
Possible Causes:
Too much oil in transmission
Adjust transmission oil level.
Low Converter Outlet Pressure
Measure converter outlet pressure. With the transmission in neutral,
measure converter outlet pressure at low engine idle speed and at 1950
RPM. Converter outlet pressure should be 30 psi minimum (207 kPa)
at low idle and 45 to 55 psi (310 to 379 kPa) at 1950 RPM. Values will
vary somewhat with oil temperature. Pressure well below specification
will produce poor converter performance. Check the converter pressure
regulator for a broken spring or stuck spool.
Check the transmission lube pressure as well. Low lube pressure is an
indication of low transmission main pump flow. Replace the main pump.
Low Engine Power
With
N
selected, fully advance the engine throttle. Maximum engine speed
should agree with the manufacturers no-load engine specification.
With the transmission in the warm-up mode, fully advance the engine
throttle. The loaded engine speed (loaded against the torque converter)
should agree with engine application specifications.
If the engine speeds do not agree with engine specifications it is possible
that the engine is not performing as expected.
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