Method For Replacing Fuel Tank Breather Element - Komatsu D85EX-18 Operation & Maintenance Manual

MAINTENANCE
9.
Turn fuel supply valve (1) at the bottom of the fuel tank to
OPEN position (O).
10. Bleed the air from the fuel circuit.
For the air bleeding procedure, see "METHOD FOR
BLEEDING AIR FROM FUELC CIRCUIT (4-38)".
11. After bleeding air from the fuel circuit, start the engine and
run it at low idle for approximately 10 minutes.
12. Check the filter seal surface for fuel leakage.
If the leakage is noticed, check the filter cartridge for its
tightening condition.
If fuel still leaks, repeat steps 1 to 6 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 7 to 12 to install it.

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.
For replacement of the hydraulic tank breather element, see "METHOD FOR REPLACING HYDRAULIC TANK
BREATHER ELEMENT (4-59)".
MAINTENANCE PROCEDURE
4-57