Komatsu D155AX-8E0, Operation & Maintenance Manual

Page: 374 / 420

9.
Turn valve (1) at the bottom of the fuel tank to “OPEN” po-
sition (O).
10. Bleed the air from the fuel circuit.
See “METHOD FOR BLEEDING AIR FROM FUEL CIR-
CUIT (4-42)”.
11. After bleeding air from the fuel circuit, start the engine and
run it at low idle for approximately 10 minutes.
12. Check that no fuel leaks through the filter sealing face.
If any fuel leaks, check the filter cartridge for its tightening
condition.
If fuel still leaks, repeat steps 1 to 5 to remove the filter cartridge, and if any damage or pinched foreign
material on the packing surface is found, replace it with a new cartridge and repeat steps 6 to 11 to install it.
REMARK
When only the filter cartridge is replaced, bleeding air from only the filter head is required. However, if the fuel
piping is removed, bleed air from the injection pump air bleeding valve as well.
METHOD FOR REPLACING FUEL TANK BREATHER ELEMENT
1.
Remove nut (2) of breather assembly (1) on the top of the
fuel tank.
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.
NOTICE
If breather assembly (1) is removed for replacement,
apply a tool to bolt (5) and tighten it.
Tightening torque: 30 to 40 Nm{3.1 to 4.1 kgm}
METHOD FOR REPLACING PILOT FILTER ELEMENT
k k
WARNING
Immediately after operation is stopped, the parts and oil are still very hot and may cause burn injury.
Accordingly, wait until they have cooled down before starting the work.
MAINTENANCE PROCEDURE MAINTENANCE
4-62