Bacharach QV2 Operation And Maintenance Instruction Manual - Troubleshooting
Vacuum Pump Models QV2 & QV5
6
P/N: 2002-0010 Rev 6
Troubleshooting
Problem
Probable Cause
Remedy
Oil level is low
Add oil until level is correct as viewed through
sight glass.
Oil is emulsified or dirty
Replace dirty oil with fresh, high-grade
vacuum pump oil.
Oil inlet or oil flow is
blocked
Clean oil inlet and filtering screen.
System leak
Check system being evacuated for
leakage and repair.
Pump is too small
Check the size of system being
evacuated and choose proper pump size.
Pump does not
produce desired
vacuum
Pump is worn
Rebuild or replace the pump.
Oil seal is damaged
Install new oil seal.
Oil leakage
Oil tank connection is
loose or damaged
Tighten oil tank screws or replace gasket.
Too much oil is in tank
Drain oil until level is correct as viewed
through sight glass.
Oil injection
Pump is too small
Check the size of the system being
evacuated and choose proper pump size.
Oil temperature is too low Open intake to atmosphere and
intermittently start motor to heat pump oil.
Foreign matter is in pump Clean the pump by replacing pump-oil.
Difficult starting
Motor is defective
Replace the motor.
Maintenance and Service
If the vacuum pump motor stops because of an overload condition, first
turn OFF the pump and open its intake to the atmosphere. Wait
5 minutes (press the RESET button if present) and try restarting the
pump. If the overload condition persists, refer to the “Difficult starting”
problem under Troubleshooting.
Keep the pump clean and avoid foreign matter from entering the pump.
Keep the vacuum pump oil at the correct level during normal operation
as viewed through the sight glass. Do not run the pump without oil.