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MAINTENANCE PROCEDURE
2)
Loosen the knob of feed pump (4), pull it out, then
pump it in and out until the movement becomes
heavy.
REMARK
•
It is not necessary to remove the plugs at the fuel
prefilter head and at the fuel main filter head.
•
When the engine runs out of fuel, use the same
procedure to operate the feed pump (4) and bleed
the air.
3)
After bleeding air, push in the knob of feed pump (4)
and tighten it.
11. Turn the starting switch key to START position (C) and
start the engine.
12. Check the filter seal surface and the mounting face of the
transparent cup for fuel leakage.
If there is any leakage of fuel, check the tightening condi-
tion of the filter cartridge.
If the fuel still leaks, remove the filter cartridge again, and
check the packing surface for damage or foreign material.
If the packing surface is damaged or there is any foreign
material on it, replace the filter cartridge with a new one,
install the filter cartridge according to the preceding procedure, and then bleed air from the fuel circuit.
13. Run the engine at low idle for approximately 10 minutes.
14. After the replacement is completed, close the engine side cover (2) and the fuel tank inspection cover.
METHOD FOR REPLACING FUEL TANK BREATHER ELEMENT
1.
Remove nut (2) of breather assembly (1) on the top of the
fuel tank.
Use a tool when the nuts are so tight to remove.
2.
Remove cover (3).
3.
Replace breather element (4) with a new one.
4.
Install cover (3) and nut (2).
In order not to damage the threaded portion of nut, tighten
nut (2) by hand until it is seated. Then tighten it 15 to 30 °
by using a tool.
METHOD FOR CHECKING ALL TIGHTENING POINTS OF ENGINE INTAKE PIPE
CLAMPS
Ask your Komatsu distributor for checking the tightening of the clamps between the air cleaner - turbocharger -
aftercooler - engine.
4-52
MAINTENANCE
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