Section7: Repair Service - Welch 8890 Owner's Manual

Gem direct-drive vacuum pump
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7.1 Repair Kits
Minor repairs to the pump can usually be performed in the field. Minor repair kits contain those parts which can
be easily replaced, are most likely to wear, and involve only minor repair. Parts constituting the internal
mechanism of the pump which would require complete pump disassembly for replacement are not included.
7.2 Major Factory Repair
With proper care, this pump 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 for repair.
Welch Rietschle Thomas maintains complete repair facilities in the United States. 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.
7.3 Minor Repair Kit For Model 8890 Vacuum Pumps
A minor repair kit, Cat. No. 8890K-02, is available for the Model 8890 Vacuum Pump. This kit contains a group
of parts that can be replaced in the field. Table 7-1 lists the contents of the minor repair kit. Refer to Figure 4-1
Exploded View Diagram. this should be used as a guide for disassembly and assembly.
Table 7.1 Minor Repair Kit for Model 8890 Vacuum Pump, Parts List
Part No.
Description
61-2158A
O-Ring, #110
61-1123A
Intake Valve
61-1128A
Backer Valve
61-1122A
Exhaust Valve
61-1178A
Silencer
61-1119B
Oil Case Gasket
61-2130A
Bumper Rubber
41-2694
Coupling Spider
41-2962
Lip Seal
61-2130A
O-Ring, #115
61-2162A
O-Ring, #015 (iso. valve models)
61-2155A
O-Ring, #020 (iso. valve models)
67-0729
Instruction Manual
61-1174A
Installation Tool
61-1175A
Insertion Tool
61-2231
Tetraseal, #127 (New S/N 1025 & Up)
61-1179A
O-ring, #034
61-9479A
Drip Pad
20

Section7: REPAIR SERVICE

Quantity
Where Used
1
Oil Drain Plug
1
Pump Module
2
Pump Module
1
Older Models
1
Older Models
1
Mounting Plate
4
Base
1
Motor/Pump
1
Wear Plate
1
Oil Fill & Intake Older Models
1
Isolation Valve
1
Isolation Valve
1
1
Lip Seal
1
Lip Seal
1
Sight Glass Window
1
Gas Ballast
1
Pump

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