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6. Troubleshooting
Problem
Insufficient air
• Filter is clogged
quantity
• Too much clearance
• Filter is clogged
• Foreign matter are caught in
• Pressure loss in piping is increased (increase in
Overload on
suction pressure)
electric motor
• Interference between rotors
• Interference between rotor and casing
• Excessive lubricant in front end cover
• Vacuum pump inlet temperature high
Overheat
• Too much compression ratio
• Interference between rotor and casing
• Interrelated position between timing gear and rotor
is incorrect
• Improper assembly
Knocking
• Abnormal rise in pressure
• Damage on gear due to overload or improper
lubricant
Bearing or gear
• Improper lubricant
damaged /
• Lubricant runs short
shaft broken
• Overload
* If the troubles are not resolved by the above mentioned actions, the cause may possibly be located in pump operation condi-
tion. In such case, please contact us with the following information.
1. Pump type & model number, serial number, application, etc.
2. Information of piping (suction pressure, strainer, mesh, number of bends, etc.)
Open cooling water supply valve. Is it flow properly ?
Close vacuum suction. Open discharge line.
Before Operation
Check lubricant colour and level. Is it acceptable ?
Check belt tension (for V-belt type only).
Run vacuum pump for few minute before open the suction line.
Check vacuum level in full vacuum. Is it normal ?
Check electric condition (voltage & amperage) in full vacuum. Is it acceptable ?
During Operation
Any abnormal noise ?
Check operation temperature. Is it normal ?
Check lubricant colour and level. Is it acceptable?
Run vacuum pump for few minute after closing suction line.
If foreign material is introduced inside of vacuum pump, clean it with cleaning agent.
Stopping
Discharge cooling water from vacuum pump if the pump is stopped for a long time.
Make sure that suction & discharge line is closed. Make sure power supply is cut off.
Cause
Vacuum system check list
- 10 -
• Clean or change filter
• Check clearance
• Clean or change filter
• Adjust or replace the rotor and casing
• Check the pressure difference between inlet and
outlet
• Adjust improper rotor clearance. Adjust timing gear
• Make the side clearance larger
Make the clearance between rotor and casing lager
• Check oil level
• Check suction & discharge pressure
• Search for the cause of interference
• Reposition
• Reassemble
• Search for the cause
• Replace timing gear
• Change lubricant
• Refill lubricant
• Replace the shaft
Check point
Solution
3.16
/ PM7
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