Section7: Repair Service - Welch 8890 Owner's Manual

Gem direct-drive vacuum pump

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Table Of Contents

Table of Contents

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