Chemglass AF-0349 Welch Vacuum Pump User Manual
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Section 8: REPAIR KITS
8.01 Shaft Seal Replacement
When the shaft seal in the mounting plate shows signs of excessive oil leakage, it should be replaced. Before
attempting replacement of the seal, the pump must be disconnected from the vacuum system and from the power
outlet.
A seal replacement kit is available. This kit contains the outer lip seal assembly and gasket, which can be replaced in
the field.
8.02 Minor Repair Kits
A minor repair kit is available that provides a group of parts that can easily be replaced in the field.
8.03 Major Factory Repair
With proper care, Welch direct drive pumps will give many years of service. The basic working parts of vacuum
pumps are machined to close tolerances and require assembly on fixtures, with special tools, by mechanics who are
highly skilled at this work. Should major repairs involving the pump mechanism become necessary, we strongly
recommend that the pump be returned to the factory, or to a Welch Vacuum Repair Center, for repair. Obtain a
Returned Goods Number from Welch Vacuum before returning any vacuum pump.
These facilities are well-equipped and staffed with experts to insure prompt reconditioning of all returned pumps.
Broken, worn, scored or corroded parts are replaced with new parts, and the pump is thoroughly evaluated and tested
to determine that it meets the performance requirements.
For warranty or non-warranty repairs, an RMA (Return Materials Authorization) number is needed prior to shipping
product to Welch. An RMA number is obtained by filling out a Safety Service Form located on the Welch web site:
www.welchvacuum.com
A Welch customer service representative will then call you with the RMA number and shipping instructions.
The reason for the Safety Service Form is that it contains information on what chemicals may have been ingested into
the pump during it’s use. Worker safety rules require this information prior to a repairman examining the pump.
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