15300 15500 (New Style) Robinair VacuMaster Vacuum Pump Replacement Parts
and Switch Assembly
and Switch Assembly (Model 15301 15501)
Gasket (All Models)
Fitting (All Models)
Fitting (Model 15800)
Fitting Adapter, 3/8" FeMale Flare x 1/2" Male ACME
Fitting, 1/4" and 3/8" Male Flare
Fitting Adapter, 1/4" Female Flare x 3/8" Male Flare
Cord (Models 15300 & 15500)
Cord (Models 15301 & 15501)
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.
Failure To Start
Check line voltage. Robinair VacuMaster® pumps are designed to start at +10% line voltage (loaded) at 41o F (5° C). At extremes, however, switching between the start and run windings may occur.
Verify the oil is not a residual accumulation from spillage, etc
If leakage exists, the module cover gasket or the shaft seal may need to be replaced. If leakage exists in the area of the oil drain plug, you may need to reseal the plug using a commercial pipe thread sealer.
Failure To Pull A Good Vacuum
Confirm the vacuum gauge and all connections are in good condition and leak-free. You can confirm leakage by monitoring the vacuum with a thermistor gauge while applying vacuum pump oil at connections or suspected leak points. The vacuum will improve briefly while the oil is sealing the leak.
Verify the pump oil is clean. A badly contaminated pump may require several oil flushes. 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.
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 overfill — 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.
When You Need Help
If these procedures do not correct the problem, contact us at our toll-free service line for further information. Century Tool & Equipment is a Certified Robinair Service Center and a distributor.
Century Tool & Equipment
4013 S. Old Hwy 94 St. Peters MO 63304