Komatsu GD555-5 Operation & Maintenance Manual page 144

OPERATION
CHECK WATER SEPARATOR, DRAIN WATER
Each part of the engine is still highly heated immediately after the engine is stopped. Do not attempt to drain cooling water or
remove the filter element cup.
High pressure is generated inside the engine fuel piping, while the engine is running. Wait for more than 30 seconds after the
engine stop for the engine to sufficiently cool down. Then start with draining cooling water or removing the filter element cup.
Do not bring fire close.
1. Open the engine side cover on the left side of the machine.
The water separator (1) forms 1 unit with the fuel prefilter, and
is at the bottom.
2. It is possible to judge the condition of water and sediment
through transparent cap (3).
accumulated, set a container under drain hose (4) to collect the
discharged water.
3. Loosen plug (2) and drain the water.
4. Tighten plug (2) as soon as fuel starts to be discharged from
drain hose (4).
(Tightening torque: 0.2 to 0.45 Nm {0.02 to 0.05 kgm, 0.03 to
0.06 lbft})
REMARK
If plug (2) is stiff, coat O-ring (5) of plug (2) with grease.
1) Set a fuel container under drain hose (4).
2) Loosen plug (2), then drain all the sediment together with
the fuel from drain hose (4).
3) Check that nothing comes out from drain hose (4), then
remove plug (2).
4) Coat O-ring portion (5) with a suitable amount of grease.
When doing this, be careful not to let the grease get on the
drain valve water drain port (a) or the plug thread.
5) Screw in plug (2) by hand until it contacts the bottom.
6) Remove the fuel container.
If transparent cap (3) is dirty and the contents cannot be easily seen, clean transparent cap (3) when
replacing the filter.
When washing, if plug (2) is removed, coat the O-ring with grease, then tighten by hand until it contacts
the bottom.
WARNING
If water or sediment is
OPERATION
3 - 91