Komatsu Galeo PC800-8 Shop Manual page 591

Hydraulic excavator

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40 Troubleshooting

Note 1: When low-pressure circuit is defective, check the following:

Clogged fuel tank breather

Water separator/Prefilter filled with water

Clogged fuel filter

Clogged screen in water separator

Stuck or worn feed pump, clogged filter

Leaked or clogged low-pressure fuel pipe

Bypass valve malfunction, defective assembly of other parts (See Fig. 1.)

Fuel in oil pan (fuel leakage in head cover)

Fig. 1: Locations of overflow valve (1), bypass valve (2), and fuel inlet joint (3)

Overflow valve (1): Spring is seen through both holes.

Bypass valve (2): Spring is seen through hole on nut side.

Fuel inlet joint (3): Gauze filter is seen through both holes.

Note 2: Follow the procedure below to check, clean, and replace filter and strainer.

1) Gauze filter: Disassemble this filter for checking. If clogged, clean it

2) Gauze filter upstream strainer: Clean upstream strainer if gauze filter is clogged

3) Fuel filter: If failure is not remedied after steps 1) and 2) above were executed, replace fuel filter

PC800, 850-8

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