MAINTENANCE SERVICE PROCEDURE
4-47
REPLACE FUEL FILTER CARTRIDGE 0.
WARNING
! Immediately after the engine is stopped, all parts are at high temperature, so do not replace the filter
immediately.
! Wait for the engine to cool down before starting the operation.
! The inside of fuel piping system of the engine is under high-pressure when the engine is running.
When replacing the filter, wait for at least 30 seconds after the engine stops to let the internal pres-
sure go down before replacing the filter.
! Do not bring any fire or spark close.
! This engine consists of higher precision parts than on the conventional fuel injection pump and noz-
zle, so if dirt gets in, it will cause problems. If there is any dirt stuck to the fuel line, use fuel to wash
it off completely.
! Always use a Komatsu genuine part for the fuel filter cartridge. If filters other than genuine filters are
used, problems may occur in the injection system, so never use substitute parts.
! Be careful when opening the air bleed plug at the fuel filter head and the air bleeder of the supply
pump. The system is still under pressure and fuel may spurt out.
! Container to catch the oil
! Filter wrench
1. Set the container to catch the fuel under the filter cartridge.
2. Using a filter wrench, turn filter cartridge (1) counterclock-
wise to remove it.
3. Clean the filter head, fill the new filter cartridge with clean
fuel, coat the packing surface thinly with engine oil, and
install it to the filter holder.
Always use clean fuel when filling with fuel, and be careful
not to let any dirt or dust get in.
Add fuel from small hole (A) (dirty side) at eight places. Do
not add fuel from hole (B) (clean side) at the center.
4. When installing, tighten until the packing surface contacts
the seal surface of the filter holder, then tighten it up 1/2 to
3/4 of a turn.
If the filter cartridge is tightened too far, the packing will be
damaged and this will lead to leakage of fuel. If the filter car-
tridge is too loose, fuel will also leak from the packing, so
always tighten to the correct amount.
5. After replacing filter cartridge (1), loosen air bleed plug (2).
6. Loosen the knob of priming pump (3), then pump the knob
until no more bubbles come out of air bleed plug (2).
7. Tighten air bleed plug (2).
Tightening torque: 7.8 to 9.8 N²m (0.8 to 1 kgf²m, 5.8 to 7.2
lbft)
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