Excess heat is generated

1. Internal leakage in the pump increases.
Repair or replace the pump because its volumetric efficiency is deteriorated.

2. Internal leakage in the valve increases.
Repair or replace the valve.

3. Internal leakage in the actuator increases.
Repair or replace the actuator.

4. The sliding part of the pump is seized up (scoring).
Repair or replace the pump.

5. The pump or bearing is seized up.
Replace the bearing.

6. The working fluid in the reservoir is insufficient.
Add the fluid or place a larger reservoir.

7. Oil cooler selection is improper.
Replace the oil cooler with a new one with a larger heat-exchange capacity.

8. The oil cooler performance is inadequate.
1. Check the water temperature and volume and take an appropriate action.
2. Overhaul the cooler and remove water strains and other contaminants.
3. Clean the radiator of the fan cooler.

9. The cooling water in the oil cooler is insufficient.
a. The water solenoid valve is not in working order.
b. The automatic water supply valve with a temperature detector is not in working order.
c. The thermostat is not in working order.
Check whether the temperature difference between the cooling water inlet and outlet is proper. Check and repair the valves and electric systems to make sure that cooling water flow is increased.

10. The heater is not in working order.
Check and repair the heater and thermostat.

11. The unload circuit is not in working order.
a. The unload set pressure is too high.
b. Pressure setting is improper, resulting in a shortened unloading time.
c. The accumulator is not in working order, or its capacity is insufficient.
d. Gas pressure of the accumulator is low.
e. The pressure switch is not in working order.
1. Check and repair the valves.
2. Correct the pressure setting.
3. Replace the failed components.
4. Check and repair the electric systems.

12. The viscosity of the working fluid is low, resulting in increased leakage.
Replace the working fluid.

13. The set pressure level is too high.
Correct the pressure setting to an appropriate level.

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