Komatsu WA150-6 Wheel Loader Service Manual

Table of Contents

• Index and Foreword
• Specification
• Structure, functions and maintenance standard
• Standard value table
• Testing and Adjusting
• Troubleshooting
• Disassembly and Assembly
• Appendix
• Diagrams and drawings

Manual Extract Bleeding air from fuel circuit :

If fuel is used up or if a fuel circuit part is removed and installed, bleed air from the fuel circuit according to the following procedure.
Put chocks under the tires securely.
When measuring, check that there are no persons around the machine.
1. Fill the fuel tank with fuel.
2. Open the right side cover of the engine.
3. Remove fuel pre-fuel filter (1) and fill it with fuel.

i. Fill the fuel filter with clean fuel and take care that dirt will not enter it.
ii. Check that the cap is fitted to part (a) (central hole) of the pre-fuel filter, and then add fuel through part (b) (holes around the central hole).
iii. After filling the pre-fuel filter with fuel, remove the cap from part (a).
iv. If clean fuel is not available, do not remove the pre-fuel filter but fill it with the fuel by operating priming pump (2).
v. Do not add fuel to fuel main filter externally.

4. Install pre-fuel filter (1) to the filter head.
i. Apply engine oil thinly over the packing on the pre-fuel filter side.
ii. After the packing of the pre-fuel filter touches the sealing face of the filter head, tighten the fuel filter 3/4 turns.

5. Loosen air bleeding plug (4) of the fuel main filter bracket and operate priming pump (2).

i. Operate the priming pump until fuel flows out of the plug hole. After checking that fuel flows out, tighten the plug (4).
ii. Confirm that air does not coexist in fuel. 3Air bleeding plug (4): 7.8 – 9.8 Nm {0.8 – 1.0 kgm}

6. Push the knob of the priming pump, and fix it.
7. Start the engine with the starting motor.
a The air in the high-pressure circuit is bled automatically if the engine is cranked.
a If the engine does not start, there may be still air in the low-pressure circuit. In this case, repeat the above procedure from step 5.