Trouble
Causes
Processing method
Pump surface
temperature is
abnormally high
Oil does not reach the specified
amount.
Refilling to correct oil level.
Decomposition check.
Cooling water does not flow.
Inspect the pump and keep water
Supply smooth.
High intake gas temperature.
Gas cooler installed at the intake port.
High ambient temperature.
Install air conditioner to reduce
Ambient temperature.
No ventilation around the pump.
Ventilation.
Excessive discharge pressure.
Check the backing pump to check if
the piping is blocked.
Rotor rotation is not flexible.
Decomposition check.
Working at high suction pressure.
Adjust pressure.
Intake pressure is higher than the
maximum allowed pressure.
Check the pressure, check backing
pump.
Pressure does
not drop
Pressure measurement method
error.
Correct measurement.
Vacuum gauge is not suitable.
Change to suitable vacuum gauge.
Relative to the capacity of the vacuum
chamber, the pumping speed is small.
Change to larger pump.
Insufficient oil.
Refilling to the correct oil level.
Oil deterioration.
Change oil.
Did not use the oil specified by the
company.
Replace with recommended oil.
Leak in the pipe.
Check leaks and plugging.
Pressure of the backing pump
deteriorates.
Check the backing pump (oil change
or overhaul).
