User Manual

7
Troubleshooting Guide
Your VacuMaster
®
pump has been designed for dependable use and
long life. If something should go wrong, however, the following guide
will help you get the pump back into service as quickly as possible.
If disassembly of the pump is required, check your warranty. The
warranty may be voided by misuse or customer tampering that
results in the pump being inoperable.
1. Check line voltage. Robinair VacuMaster
®
pumps are designed to
start at +10% line voltage (loaded) at 41
o
F (5° C). At extremes,
however, switching between the start and run windings may occur.
1. Verify the oil is not a residual accumulation from spillage, etc.
2. If leakage exists, the module cover gasket or shaft seal may need
to be replaced. If leakage exists near the oil drain plug, you may
need to reseal the plug using a commercial pipe thread sealer.
1. Conrm the vacuum gauge and all connections are in good
condition and leak-free. You can conrm leakage by monitoring
the vacuum with a thermistor gauge while applying vacuum pump
oil at connections or suspected leak points. The vacuum will
improve briey while the oil is sealing the leak.
2. Verify the pump oil is clean. A badly contaminated pump may
require several oil ushes. See OIL CHANGE PROCEDURE.
Note: Use only high vacuum pump oil such as Robinair’s Premium
High Vacuum Pump Oil. Other oils will prevent pull-down to a deep
vacuum.
3. Verify the oil is at the correct level. For maximum pump operation,
the oil must be even with the OIL LEVEL line on the sight glass
when the pump is running. See OIL CHANGE PROCEDURE.
Do not overll — operating temperatures will cause the oil to
expand, so it will appear at a higher level than when the pump is
not running. To check the oil level, start the pump with the inlet
capped. Check the oil level in the sight glass. Add oil if necessary.
If these procedures do not correct the problem, contact your
nearest Robinair distributor, or call Robinair’s toll-free service line
for further information: 800-822-5561 (USA only).
When You
Need Help
Failure
To Start
Oil
Leakage
Failure
To Pull
A Good
Vacuum