The rotors do not turn, and cannot be turned
either way by hand:
Failure of the motor
Repair or change motor
The rotors do not turn, and cannot be turned
by hand either way:
Rotors are jammed, stuck or seized
Free the rotors
Check for signs of overheating
(discolouration) and contact Busch Service for
a service/ dismantling for repair
Foreign substances in the pump
Dismantle pump to clean and repair
Abnormal sounds or vibrations:
STOP BLOWER IMMEDIATELY !!
Excessive wear of bearings
Change bearings
Too little gear oil in the pump, or oil in the
pump is worn
Top up with oil/ Change gear oil
Resonance of piping
Provide support for the piping or use flexible
connections
**Abnormal increase of discharge pressure
Refer to cause marked with **
Leakage
Find and stop leaks
Synchronising the rotors
Have the vacuum pump repaired (Busch
service)
Foreign particles in the gear housing
Have the vacuum pump repaired (Busch
service)
Failure of non-return valve
Change non-return valve
Abnormal heat
Abnormal increase of discharge pressure
Refer to causes marked with **
Rotational speed of blower and/ or motor too
low (when using a frequency converter)
Check the minimal admissible rotational speed
and correct
Too much gear oil in the housing
Fill in oil only to the target circle of the oil
sight glass, while the blower is switched off
Ambient temperature too high
Increase ventilation of the machine room/
increase rotational speed (ventilation) of
motor
Blockage of the suction inlet or filter
Clean suction inlet, and clean or change filter
Excessive wear of rotors and consequently
increase of rotor tolerances
Install filter and dismantle blower for repair
Have the vacuum pump repaired (Busch
service)
**Abnormal increase of discharge pressure
Blockage of discharge pipe
Clean discharge pipe
Blockage of system piping
Clean system piping
Primary pump failure
Have the vacuum pump repaired (Busch
service)
Oil leaks
Too much oil in the pump
Fill up oil only to the target circle of the oil
sight glass, while the blower is switched off
Worn or broken mechanical seals
(oil-lubricated single mechanical seals) do not
apply to WY pumps
Change mechanical seals
Ambient conditions and vacuum combined
with pressure operation and high dP
Fit an oil separator, ensure adequate
ventilation
Pump has been tilted or is not level
Install the pump on a horizontal surface
Oil level in the seal housing fluctuates
abnormally (Applies to pumps equipped with
a drop oiler)
Worn or broken mechanical seals
Change mechanical seals
Troubleshooting
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Содержание WY 4500 C
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