Vacuum Pumps 5Rev. 11/03/06
VACUUM PUMPS
Operating Manual
trOuBLesHOOtinG tips:
Failure to Pull Good Vacuum
1. Verify the gauges and connections are leak-free and in good condition. You can confirm this by monitoring
vacuum with a thermistor vacuum gauge while applying vacuum pump oil at connections or suspected leak
points. The vacuum will improve briefly while the oil seals the leak, and then revert to the previous level.
2. Verify the pump oil is clean. A badly contaminated pump may require several flushes (see “Changing Oil”) on
page 4 before you are able to reach the rated vacuum level.
3. Verify the oil is at the proper level. For proper vacuum operation, the oil level must be at the mid-point of
the Sight Glass, located on the front of the pump. Overfilling will not affect vacuum operation, but may
result in oil blowing from the exhaust during free air operation.
Failure to Start
1. Check line voltage. Your vacuum pump is designed to start at minus 10% of rated voltage and at 32º F
(0º C).
2. If the pump is accidentally shut down in a vacuum condition, the pump may hesitate when restarted. This is
because the vacuum pump oil has been drawn into the pump module. The pump will run normally after
clearing the oil from the module.
Oil Leakage
1. Verify the oil is not a residual accumulation due to spillage, overfilling, or similar causes.
2. If the pump is actually leaking oil, you may have to replace the housing gasket.
WarrantY:
NAPA Cold Power vacuum pumps are warranted against defects in material or workmanship for a period of one
year of normal use from date of purchase. This warranty is extended to the original retail purchaser only. If within
one year from date of purchase, the vacuum pump should prove to be defective, return it to the servicing NAPA
Auto Parts outlet from whom you originally purchased the vacuum pump, accompanied by a valid proof of
purchase.
Upon determining that a valid warranty claim exists, the NAPA Auto Parts outlet is authorized to exchange the
faulty vacuum pump for a new vacuum pump of the same model at no additional charge.
Many alleged defectives may simply be handled by calling your NAPA Auto Parts outlet for parts as listed in the
replacement parts list.
The warranty shall not apply to any product or part which has been subject to misuse, negligence, or accident. The
Seller shall not be responsible for any special or consequential damages, and the Warranty as set forth is in lieu
of all other warranties either expressed or implied. However, the Seller makes no warranty of merchantability in
respect to any of the goods offered in the manual and any applicable manufacturer’s shop or service manuals
referred to therein, including any subsequent service bulletins.
Out OF WarrantY:
Note that contaminated oil or an incorrect oil level will adversely affect pump performance. These conditions
should be checked on a regular basis. Replacement parts are available if you desire to repair your own pump. How-
ever, this should be considered only in out-of-warranty situations.
