336E Excavator and 336E MHPU Mobile Hydraulic Power Unit C9.3 Engine Supplement Water Separator and Fuel Priming Pump - Remove and Install Caterpillar

Removal Procedure

1. Turn the fuel supply and the power disconnect switch to the OFF position.
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   Illustration 1	g02177823

2. Remove primary fuel filter assembly (5) from the fuel filter base. Refer to Operation and Maintenance Manual, "Fuel System Primary Filter (Water Separator) Element - Replace".

3. Disconnect hose assemblies (3). Disconnect harness assembly (2) and harness assembly (6).

4. Remove bolts (4) and water separator and fuel priming pump (1).
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   Illustration 2	g02177869

5. Remove plug (7) and the O-ring seal. Remove bolts (8) and manifold (9).
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   Illustration 3	g02177896

6. Remove nuts (11) and disconnect harness assemblies (10).
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   Illustration 4	g02177906

7. Remove pump assembly (16) from the housing assembly.

8. Remove seal (12), backup ring (13), seal (14), and backup ring (15) from pump assembly (16). Remove harness assembly (10) from the housing assembly.
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   Illustration 5	g02177930

9. Remove fitting (18) from pump assembly (16). Remove O-ring seal (20) and backup ring (19). Remove O-ring seal (17) from fitting (18).
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   Illustration 6	g02178054

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   Personal injury can result from being struck by parts propelled by a released spring force. Make sure to wear all necessary protective equipment. Follow the recommended procedure and use all recommended tooling to release the spring force.

10. Remove plug (21), O-ring seal (22), spring (23), check valve (25), and O-ring seal (26). Repeat for plug (24).

11. Remove stud (27).
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    Illustration 7	g02178237

    Note: Note the orientation of solenoid assembly (30) for installation purposes.

12. Remove nut (28), solenoid assembly (30), and cartridge assembly (31). Remove check valve (29).
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    Illustration 8	g02178223

13. Remove O-ring seal (32), O-ring seal (33), and backup ring (34) from cartridge assembly (31).
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    Illustration 9	g02178254

14. Remove O-ring seal (35), backup ring (36), and O-ring seal (37) from check valve (29).

Installation Procedure

1. Install the fuel priming pump in the reverse order.

   1. Tighten check valve (29) to a torque of 28 ± 3 N·m (21 ± 2 lb ft).

   2. Tighten cartridge assembly (30) to a torque of 28 ± 3 N·m (21 ± 2 lb ft).

   3. Tighten nut (28) to a torque of 6.5 ± 0.5 N·m (58 ± 4 lb in).

   4. Tighten plug (21) and plug (23) to a torque of 95 ± 10 N·m (70 ± 7 lb ft).

   5. Apply Tooling (A) to the threads of stud (27) before installation. Tighten stud (27) to a torque of 50 ± 5 N·m (37 ± 4 lb ft).

   6. Tighten plug (7) to a torque of 11 ± 2 N·m (97 ± 18 lb in).