Komatsu WA500-6H Operation & Maintenance Manual page 326

4.9 Service procedure
Every 1000 hours service
5. Check that cap (B) is installed to the new filter cartridge, then
fill with clean fuel.
NOTE
When filling with fuel, always use fresh fuel and be careful not to
let any dirt or dust get in. Fill with fuel through 8 small holes (A)
(dirty side). Cap (B) is to prevent oil containing dirt from getting
into the clean side. Always add the oil with cap (B) installed.
If clean fuel is not available, do not add fuel. In this case,
when bleeding the air from the fuel circuit, the number of
times needed for priming increases.
6. Coat the packing surface of the filter cartridge with oil.
7. Remove filter cartridge cap (B) and install to the filter holder.
8. When installing, tighten until the packing surface contacts
the seal surface of the filter holder, then tighten it up 1/2 to 3/
4 of a turn.
If the filter cartridge is tightened too far, the packing will be
damaged and this will lead to leakage of fuel. If the filter car-
tridge is too loose, fuel will also leak from the packing, so
always tighten to the correct amount.
9. Replace the filter cartridge and bleed the air as follows:
10. Open the fuel valve.
11. Loosen plug (2) at the top of the fuel filter head, then remove
other plug (3).
NOTE
Do not loosen the plug of the fuel pre-filter head. This is at the
suction end, so if it is loosened, it will be impossible to bleed the
air.
4-72
A
WA500-6H – VEAM430100
Maintenance
B
GK050239
3
2
GK050248