Check Additional Water Separator, Clean Inside Of Case (Only Poor Fuel Arrangement Specification) - Komatsu D31EX -22 Operation & Maintenance Manual

SERVICE PROCEDURE
CHECK ADDITIONAL WATER SEPARATOR, CLEAN INSIDE OF CASE (ONLY POOR FUEL
ARRANGEMENT SPECIFICATION)
The engine fuel piping system is under high internal pressure when the engine is running. Always reduce the internal pressure
before draining water or replacing the element cup.
Do not bring fire close.
This engine consists of higher precision parts than on the conventional fuel injection pump and nozzle, so if dirt gets in, it will
cause problems. If there is any dirt stuck to the fuel line, use fuel to wash it off completely.
NOTICE
When carrying out inspection and maintenance of the fuel system, the particularly careful not to let any dirt or dust get in. If
there is any dirt of dust around the fuel system, clean it off thoroughly with fuel before starting the operation.
To prevent dirt or dust from getting into the fuel circuit, remove all dirt and dust from the surrounding area before starting the
operation.
Prepare a container to catch the fuel.
1. Drain the water and fuel. For details, see "CHECK ADDITIONAL WATER SEPARATOR, DRAIN WATER
(ONLY POOR FUEL ARRANGEMENT SPECIFICATION) (PAGE 3-70)".
2. Loosen the ring nut (1), then remove case (2).
3. Pull screen (5) down to remove it from the water separator
holder (3).
4. Wash screen (5) in clean fuel.
Check screen (5) and replace it if it is damaged.
5. Wash the inside of case (2) with clean fuel.
Check case (2). If it is scratched or damaged, or so dirty that
the position of float (6) cannot be checked, replace case (2).
6. Wash the inside of water separator holder (3) with clean fuel.
7. Install screen (5) to the water separator holder.
8. Replace O-ring (7) with a new part.
9. Tighten plug (4) and insert in case (2). Be careful not to let float (6) be at an angle.
Tightening torque: 2.0 - 3.0 Nm (0.20 - 0.31 kgm, 1.4 - 2.2 lbft)
10. Install case (2) to the water separator holder (3), then tighten ring nut (1).
Tightening torque: 23 - 27 Nm (2.4 - 2.8 kgm, 17.0 - 19.9 lbft)
11. After completing the inspection and cleaning, bleed the air. Use the same procedure as when replacing the fuel
filter cartridge.
For details of the method of bleeding the air, see "REPLACE FUEL PRE-FILTER CARTRIDGE (PAGE 4-62)".
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WARNING
MAINTENANCE