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4 Troubleshooting Guide
Fault
Possible cause
Pump does not start.
Pump is connected incorrectly.
Operating voltage does not match motor.
Motor protection switch incorrectly set (on three-phase motors).
Switch is malfunctioning (on single-phase motors).
Motor is malfunctioning.
Oil temperature is below 12°C (54°F).
Oil is too viscous.
Exhaust filter / exhaust line is clogged.
Vane is broken. (Sign: pump is jammed).
Pump is seized up. (Sign: pump is jammed).
Pump does not reach
Pump is too small.
ultimate pressure.
Measuring technique or gauge is unsuitable.
Pump is too cold.
Float valve does not close.
Inadequate lubrification due to
- missing oil,
- contaminated oil,
- clogged oil lines.
External leak 2).
Anti-suckback valve close.
Exhaust valve is incorrectly mounted or malfunctioning.
Vanes are stuck in their slots.
Rotor clearance is too large.
Pumping speed is too
Dirt trap in the intake port is clogged.
low.
Exhaust filter is clogged.
Connecting lines are too narrow or too long.
Anti-suckback valve is hard to open.
Vanes are stuck in their slots.
Pump gets unusually
Cooling faces are obstructed or dirty.
hot.
Exhaust filter / exhaust line is obstructed.
Inadequate lubrification due to
- low oil level,
- contaminated oil,
- clogged oil lines.
Exhaust valve is malfunctioning.
Pump is too loud
Inadequate lubrification due to
- low oil level,
- contaminated oil,
- clogged oil lines.
Pump is too cold..
Fan is worn out.
Motor cover is not properly tightened.
Large vacuum leak in system.
Oil consumption is too
Exhaust filter elements are clogged or damaged
high, oil mist at exhaust.
Nozzle of the float valve is clogged.
Oil level is too high.
Exhaust filter element is incorrectly mounted.
Oil in the intake line or
Oil comes from vacuum system.
vacuum vessel.
Anti-suckback valve is obstructed.
Sealing surfaces of the anti-suckback valve are dirty or damaged.
Motor turns in the wrong direction (on three-phase motors).
Oil level is too high.
Oil is turbid or dark
Condensation.
Oxidation.
1) Reference section: This column refers to the section in the Operating Instructions that contains the applicable repair information.
2) 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.
N.B.: For any other operation as described before, return the pump to a Œrlikon Leybold Vacuum service center.
28
GA02300_000_23 - 03/2010
Remedy
Connect correctly.
Replace the motor.
Set motor protection switch properly.
Replace the switch.
Replace the motor.
Heat the pump and pump oil or use different oil.
Change the oil.
Replace the filter or repair the pressure relief valves, clean the
exhaust line.
Replace the vane.
Repair the pump.
Check the process date; replace the pump, if necessary.
Use correct measuring technique and gauge. Disconnect the pump
from the system and measure the pressure directly at the pump.
Let the pump warm up for approx. 15 min.
Check the float valve and repair it if necessary.
Refill oil.
Degas or change the oil.
Clean the oil lines and oil case.
Repair the pump.
Repair the valve.
Mount the valve properly or replace.
Remove the vanes; clean the vanes and slots.
Repair the pump.
Clean the dirt trap; Precaution: install a dust filter in intake line
Replace the filter element.
Use wider or shorter connecting lines.
Remove the vanes; clean the vanes and slots.
Repair the pump.
Set pump up correctly or clean the cooling faces.
Replace the exhaust filter, clean the exhaust line.
Refill oil.
Degas or change the oil.
Clean the oil lines and oil case.
Replace the valve.
Refill oil.
Degas or change the oil.
Clean the oil lines and oil case.
Let the pump run up for approx. 15 min.
Change the fan.
Tighten the motor cover.
Repair vacuum leak.
Replace the exhaust filter.
Check the float valve, clean the nozzle.
Drain the exces oil.
Dismount the filter element and tighten the filter support.
Check the vacuum system.
Clean or repair the valve.
Clean or repair the intake port and anti-suckback valve.
Interchange two phases at the motor connection.
Drain the excess oil.
Degas the oil or change the oil and clean the pump.
Precaution: open the gas ballast valve or insert a condensate trap.
Change the oil.
Reference
section 1)
2.3
Service
2.3
3.8
Service
3.3
3.4 / 3.6
3.7
Service
-
2.7
2.5
3.6
3.3
3.2.2 / 3.3
-
Service
3.6
3.6
3.7
Service
2.2.1 / 3.5
3.4
2.2
3.7
Service
2.1
3.4 / 3.6
3.3
3.2.2/3.3
-
3.6
3.3
3.2.2/3.3
-
2.5
Service
2.3.2
3.4
3.6
3.3
3.4
-
3.6
3.6
2.3
3.3
3.2.2 / 3.3 / 2.2.1
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