Troubleshooting guide
4 Troubleshooting
Fault
Possible cause
Remedy
Reference
Pump does not start
Pump is connected incorrectly
Connect the pump correctly
2.3
Motor protection switch incorrectly set.
Set motor protection switch properly
2.3
Operating voltage does not match motor
Replace the motor
Motor is malfunctioning
Replace the motor
Oil temperature is below 12°C (54°F)
Heat the pump and pump oil or use different oil
1.8
Oil is too viscous
Use appropriate oil grade
3.3
Exhaust filter / exhaust line is clogged
Replace the filter or clean the exhaust line
3.4
Pump is seized up (sign : pump is jammed)
Repair the pump
3.11 / 3.12
Pump does not reach ultimate
pressure
Measuring technique or gauge is unsuitable
Use correct measuring technique and gauge
2.7
External leak 1) - Piping fittings loose
Repair the pump - Retighten
Float valve does not close
Repair the valve
3.9
Anti-suckback valve is malfunctioning
Repair the valve
3.6
Exhaust valve is malfunctioning
Repair the valve
3.10
Inadequate lubrication due to :
- unsuitable or contaminated oil
- clogged oil filter
- clogged oil lines
Change the oil
Replace the oil filter
Clean the oil lines and oil case
3.3
3.3
Vacuum lines are dirty
Clean vacuum lines
Pump is too small
Check the process date ; replace the pump, if necessary
Pumping speed is too low
Dirt trap in the intake port is clogged
Clean the dirt trap. Precaution : install a dust filter in intake line
3.5
1.4/2.2.1
Exhaust filter is clogged
Install new filter elements
3.4
Connecting lines are too narrow or too long
Use adequately wide and short connecting lines
2.2
Anti-suckback valve is hard to open
Check spring free length
After switching off pump under
vacuum, pressure in system
rises too fast
System has a leak
Anti-suckback is malfunctioning
Check the system
Repair the valve
3.6
Pump gets too hot
Cooling air supply is obstructed
Set pump up correctly
2.1
Cooler is dirty
Clean the cooler
3.8
Ambient temperature is too high
Set pump up correctly
2.1
Process gas is too hot
Change the process
Oil level is too low
Add oil to reach the correct oil level
3.3
Oil is unsuitable
Change the oil
3.3
Oil cycle is obstructed
Clean or repair the oil lines
Exhaust filter / exhaust line is obstructed
Replace the exhaust filter, clean the exhaust line
3.4
Exhaust valve is malfunctioning
Repair the valve
3.10
Pump module is no longer usable
Replace the pump module
3.11
Oil in intake line or in vacuum
vessel
Oil comes from the vacuum system
Check the vacuum system
Anti-suckback valve is obstructed
Clean or repair the valve
3.6
Sealing surfaces or anti-suckback valve are damaged or dirty
Clean or repair the intake port and valve
3.6
Oil level is too high
Drain the excess oil
3.3
Oil is turbid
Condensation
Degas the oil or change the oil and clean the pump. Precaution :
open the gas ballast valve or insert a condensate trap. Clean the gas
ballast intake filter
2.5.2./3.2.2.
3.7
Pump is excessively noisy
Oil level is very low (oil is no longer visible)
Add oil
3.3
Oil filter is clogged
Change the oil and filter
3.3
Coupling element is worn
Install new coupling element
3.11
Large vacuum leak in system
Repair vacuum leak
3.11/3.12
* Reference section : This coluum refers to the section in the Operating Instructions that contains the applicable repair information. 1) Bubble test : Let the pump run at operating temperature with degassed
oil, without gas ballast and with closed intake port. Immerse the exhaust line in a bucket of water. If a steady stream of bubbles appear, the pump has an external leak. NB: For any other operation as
described before, return the pump to a Oerlikon Leybold Vacuum servcie center.
GA02330_002_06 - 01/2010 - © Oerlikon Leybold Vacuum
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