Komatsu D155A-6 Operation & Maintenance Manual page 277

SERVICE PROCEDURE SERVICE PROCEDURE
7. Loosen ring nut (6) to remove casing (7).
8. Remove screen (8) from the water separator table, pulling the
screen out downward.
9. Wash screen (8) with clean fuel.
At that time, also check it for damage and if any, replace it with
a new one.
10. Wash the interior of casing (7) for damage, a crack or so bad
a contamination as to make it impossible to identify the location
of float (9), and if any of them is found, replace the casing with
a new one.
11. Install screen (8) on the water separator table.
12. Replace O-ring (10) with a new one.
13. Put float (9) in casing (7) the way it does not tilt, and then pour
clean fuel in the casing calmly.
14. Install casing (7) on the water separator table and tighten ring
nut (6).
Tightening torque: 16 - 20 Nm (1.6 - 2.0 kgm, 11.6 - 14.5 lbft)
15. Install water drain plug (4).
16. Tighten water drain plug (4).
Tightening torque: 1.5 - 2.5 Nm (0.15 - 0.25 kgm, 1.1 - 1.8 lbft)
17. In case air intake plug (5) has been loosened to drain fuel,
tighten it now.
Tightening torque: 8.0 - 12.0 Nm (0.8 - 1.2 kgm, 5.8 - 8.7 lbft)
18. Turn fuel valve (3) to the "OPEN" position (O).
19. Close the inspection cover.
20. When the whole work is finished, bleed air from the water separator the same way as when replacing the fuel
filter cartridge.
For the air bleeding procedure, see "BLEED AIR FROM FUEL CIRCUIT (PAGE 4-50)".
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MAINTENANCE MAINTENANCE