Komatsu D37EX-24 Operation & Maintenance Manual page 322

MAINTENANCE PROCEDURE
1.
Open the fuel tank inspection cover on the right side of the
machine.
2.
Turn the fuel supply valve (1) to CLOSE position (C).
3.
Open the engine side cover (2) on the left side of the ma-
chine.
4.
Take out the drain hose (3) toward the left side of the ma-
chine.
5.
Place a container to catch fuel under the drain hose (3).
6.
Loosen the drain valve (4) and drain the water and sedi-
ments from the transparent cup (5), and also drain all the
fuel from the filter cartridge (6).
7.
Turn the transparent cup (5) counterclockwise to remove it
by using the filter wrench.
This cap is used again. If the cap is damaged, replace it
with a new one.
8.
Turn the filter cartridge (6) counterclockwise by using the
filter wrench, and remove it.
9.
Install the removed transparent cup (5) to the bottom of the
new filter cartridge.
At this time, be sure to replace the O-ring with a new one.
When replacing the O-ring, coat the surface with clean fuel
before installing it.
10. After the packing surface touches the seal surface of the filter cartridge, tighten the transparent cup (5) 1/4
to 1/2 turn.
REMARK
If the transparent cup is fastened too much, the O-ring will be damaged and this leads to leakage of fuel. If
it is too loose, fuel will also leak from gaps of the O-ring. Therefore, be sure to observe the tightening angle.
11. Clean the filter head.
12. Fill the new filter cartridge with clean fuel, thinly apply oil to the packing surface, then install it to the filter
head.
NOTICE
• When filling the filter cartridge with fuel, do not re-
move the cap (B). Always fill with fuel from the
small holes (A) (8 places) on the dirty side.
• After filling with fuel, remove the cap (B) and in-
stall the fuel filter.
• Always fill with clean fuel. Be careful not to let any
dirt or dust get into the fuel. In particular, center
portion is the clean side, so do not remove the cap
(B) when filling with fuel. Be careful not to let dirt
or dust get into the center portion on the clean
side.
13. After the packing surface reaches the sealing surface of the filter head, tighten the filter cartridge 3/4 turns.
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MAINTENANCE