Komatsu PC88MR-10 Shop Manual page 506

40 Troubleshooting
Related information on troubleshooting
2. Turn valve (2) at the bottom of the main valve to
CLOSE position (S).
3. Open the engine hood.
4. Place a container under the filter cartridge (3) to
receive the fuel.
5. Turn filter cartridge (3) counterclockwise by
using the filter wrench, and remove it.
6. Clean the filter head, thinly apply oil to the
packing surface of the new filter cartridge, then
install it to the filter head.
a Do not add fuel to the new filter cartridge (3).
a Remove cap (B) in center, and install filter
cartridge (3).
40-18
7. When installing the filter cartridge, tighten it until
the packing surface contacts the sealing surface
of the filter head, then tighten it more than 2/3
turn.
a If the filter cartridge (3) is fastened too much,
the packing will be damaged and this leads
to leakage of fuel. If the filter cartridge is too
loose, fuel will also leak from the packing.
Therefore, be sure to observe the fastening
angle.
When using a filter wrench for tightening,
take care not to leave flaws or dents on the
filter.
8. Turn valve (2) at the bottom of the main valve to
OPEN position (O).
9. Bleed air according to the following procedure.
1) Fill up the fuel tank with fuel (to the level
where the float is at the highest position).
2) Loosen fuel feed pump knob (4) and draw it
out once, then push and pull several times
until its movement becomes stiff.
There is no need to remove the plugs at
the head of the fuel prefilter and fuel main
filter.
When the engine runs out of fuel, use the
same procedure to operate fuel feed
pump (4) and bleed the air.
3) Push in and tighten fuel feed pump knob (4).
10.After replacing filter cartridge (3), start the
engine and run it at low idle for 10 minutes.
PC88MR-10