Welch 8905 - Section 08 - Specifications; Shaft Seal Replacement; Minor Repair Kits; Major Factory Repair

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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 eld.
8.02 Minor Repair Kits
A minor repair kit is available that provides a group of parts that can easily be replaced in the eld.
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 xtures, 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 lling 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.
Model 8905 8907 8912 8917 8920 8925
Seal Kit 8905K-03 8917K-03 8917K-03 8917K-03 8915K-03 8925K-03
Model 8905 8907 8912 8917 8920 8925
Minor Repair Kit 8905K-02 8917K-02 8917K-02 8917K-02 8915K-02 8925K-02