Komatsu PC88MR-10 Shop Manual page 504

40 Troubleshooting
Related information on troubleshooting
a The common rail fuel injection system used on
this machine consists of more precise parts than
those in the conventional injection pump and
nozzles. If any cartridge other than a Komatsu
genuine fuel prefilter cartridge is used, foreign
materials may enter and problem may occur in
the injection system. Do no use substitute parts.
a During testing or maintenance of the fuel system,
take extreme care not to allow any foreign
material to enter the fuel system. If any dust or
other material sticks to any part, wash the part
thoroughly with clean fuel.
Prepare a container to receive drained oil.
Prepare a filter wrench.
The water separator inspection, and drainage of
water and sediments
1. Open the engine hood.
The water separator is integrated with fuel
prefilter (1).
2. Through the transparent cup (2), water quantity
or sediments can be visually checked. If they are
accumulated, place a container to receive water
under the drain hose (3).
3. Loosen drain valve (4) to drain the water.
4. If drain hose (3) starts to discharge fuel, close
drain valve (4) immediately.
a If water in transparent cup (2) is frozen, drain
the water only after confirming that it has
completely melted.
a If you cannot visually identify the presence of
water due to stains on transparent cup (2),
clean transparent cup (2) when replacing fuel
prefilter cartridge (1).
a When you have removed drain valve (4) for
the above cleaning process, coat the O-ring
with grease and tighten drain valve until it
touches the bottom.
Replace fuel prefilter cartridge
1. Open inspection cover (5).
40-16
2. Turn valve (6) at the bottom of the main valve to
CLOSE position (S).
3. Open the engine hood.
4. Place a container under the fuel prefilter
cartridge to receive the fuel.
5. Loosen drain valve (4) and drain the water and
sediments from transparent cup (2), and also
drain all the fuel from filter cartridge (1).
6. Turn transparent cup (2) counterclockwise by
using filter wrench, and remove it. (This cap is to
be reused.)
7. Turn filter cartridge (1) counterclockwise by
using the filter wrench, and remove it.
8. Install currently removed transparent cup (2) to
the bottom of the new filter cartridge.
a At this time, replace O-ring (7) with a new
one.
9. When installing the transparent cup, thinly apply
oil to the packing surface, contact it to the
PC88MR-10