Doosan DX700LC Operation And Maintenance Manual page 230

Change Fuel Filter
Exchange filter after waiting for engine to cool. Be careful of
fire hazards. Do not smoke.
1. Locate fuel filter inside engine compartment.
2. Position a small container under fuel filter.
3. Unscrew fuel filter from head assembly. Discard fuel filter.
NOTE:
Dispose of drained fluids according to local
regulations.
4. Change new O-ring in the filter cases.
5. After cleaning filter head, install new fuel filter. Screw filter
on head until gasket contacts head, and turn filter 1/4 turn
more with a filter wrench.
NOTE:
Coat fuel filter gasket with fuel.
NOTE: Fill fuel filter with clean fuel. This will help
reduce fuel system priming.
Fuel System Priming
If air remains in the fuel inlet line to the engine, it may cause the
engine to run in an abnormal condition. Air may impact the
starting capability of the engine, and may also result in surging
engine speeds.
If the machine happens to have run out of fuel, or if the fuel filter
has been replaced, air may need to be bleed using the following
procedure:
1. Shut down engine.
2. Loosen plug (1, Figure 69) on the fuel prefilter head.
3. Pump the hand operated primer pump (2, Figure 69) on the
fuel prefilter. Pump primer until fuel is present at plug hole
in fuel prefilter head.
4. Tighten plug (1, Figure 69) in fuel prefilter head.
5. Continue to pump primer pump until a strong resistance is
felt.
6. Start engine and look for signs of leaks.
7. Repeat procedure if necessary.
Inspection, Maintenance and Adjustment
4-42
WARNING
Figure 67
Figure 68
1
Figure 69
FG016135
FG016178
2
FG000431
OP001123