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4 Problem analysis
Troubleshooting Guide
Fault
Possible cause
Pump does not
Pump is connected incorrectly.
start.
Motor protection switch incorrectly set.
Operating voltage does not match motor.
Motor is malfunctioning.
Oil temperature is below 12 °C (54 °F).
Oil is too viscous.
Exhaust filter / exhaust line is clogged.
Pump does not
External leak.
reach ultimate
Float valve does not close.
pressure.
Anti-suckback valve is malfunctioning.
Inadequate lubrication due to:
- unsuitable or contaminated oil,
- clogged oil lines.
Vacuum lines are dirty.
Pump is too small.
Pumping speed is
Dirt trap in the intake port is clogged.
too low.
Exhaust filter is clogged.
Connecting lines are too narrow or too long.
After switching off
System has a leak.
pump under
Anti-suckback is malfunctioning.
vacuum, pressure in
system rises too
fast.
Pump gets too hot. Cooling air supply is obstructed.
Cooler is dirty.
Ambient temperature is too high.
Process gas is too hot.
Oil level is too low.
Oil is unsuitable.
Oil cycle is obstructed.
Exhaust filter / exhaust line is obstructed.
Oil in intake line or
Oil comes from the vacuum system.
in vacuum vessel.
Anti-suckback valve is obstructed.
Sealing surfaces of anti-suckback valve are damaged
or dirty.
Oil level is too high.
Pump's oil
Exhaust filters are clogged or damaged.
consumption too
Nozzle of float valve is clogged.
high, oil mist at
Oil level is too high.
exhaust.
Oil is turbid.
Condensation.
Pump is excessively
Oil level is very low (oil is no longer visible).
noisy.
* Reference section: This column refers to the section in the Operating Instructions that contains the applicable repair information.
N.B.: Never mount used seals. Always mount new seals.
Remedy
Connect the pump correctly.
Set motor protection switch properly.
Replace the motor.
Replace the motor.
Heat the pump and pump oil or use different oil.
Use appropriate oil grade.
Replace the filter or clean the exhaust line.
Repair the pump.
Repair the valve.
Repair the valve.
Change the oil (degas it, if necessary).
Clean the oil casing.
Clean vacuum lines.
Check the process date; replace the pump, if necessary.
Clean the dirt trap.
Precaution: install a dust filter in intake line.
Install new filter elements.
Use adequately wide and short connecting lines.
Check the system.
Repair the valve.
Set pump up correctly.
Clean the cooler.
Set pump up correctly max 40° C.
Change the process.
Add oil to reach the correct oil level.
Change the oil.
Clean or repair the oil lines.
Replace the exhaust filter, clean the exhaust line.
Check the vacuum system.
Clean or repair the valve.
Clean or repair the intake port and valve.
Drain the excess oil.
Replace the filters.
Check the valve, clean the nozzle.
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.
Clean the gas ballast intake filter.
Add oil.
Reference
section *
2.5
2.5
-
-
2.1
3.3
3.4
-
3.9
3.7
3.3
-
-
-
3.6
3.4
2.2
-
3.7
1.4
-
-
-
3.3
3.3
-
3.4
-
3.7
3.7
3.3
3.4
3.9
3.3
2.6
3.5
3.3
GA02314_000_C0 - 11/2016 - © Leybold
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