Terex TS14G, Maintenance Manual

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Section 120-0070
SM 1735 2-99
3
Transmission - Transmission Electronic Controls
POWERSHIFT TROUBLESHOOTING
Symptom Problem Solution
Erratic oil pressure.
Low oil level. Add oil to proper level.
Suction tube fitting. Replace 'O' ring fitting.
Suction manifold 'O' ring not sealing. Replace 'O' ring.
Foreign object in suction port. Remove object and check
for other contamination.
Excessive oil pressure.
Sticking main regulator valve. Replace main regulator valve.
Faulty spring. Replace main regulator.
Low oil pressure in all gears.
Sticking main regulator valve. Replace main regulator valve.
Control valve body gasket leaking. Replace gaskets.
Charge pump defective. Replace pump.
Internal disconnect seal damage or Replace seal and install correctly.
installed incorrectly.
Faulty main regulator valve. Replace main regulator valve.
Control valve body cracked. Replace control valve body.
Low pressure in one gear but
Contaminated proportional solenoid. Replace proportional solenoid.
all right in other gears.
*Check suction screen for
contamination.
Broken wire to one solenoid, or Repair wire.
dirty connection.
Broken seal ring on input end of Replace seal ring.
clutch assembly.
Bore sleeve worn. Replace bore sleeves.
Outer or inner piston seal leaking. Replace seals.
Vehicle will not move.
Voltage to wrong solenoids on Check wiring and connecters.
control valve. (See schematic.)
Converter damage. Rebuild converter.
No voltage to all solenoids. Check wiring, controller and
connecters.
Voltage to more than two solenoids. Check wiring and controller.
Proportional solenoid stuck. Replace solenoid.
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