BUSCH WY 4500 C, Installation And Operating Instructions Manual

Page: 19 / 24

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
Page 19