Doosan G20 SIIIA, Operation & Maintenance Manual

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92 G20, 30, 40 SIIIA Operation & Maintenance Manual
(b) Draining of the oil/water separator
Draining Water from Fuel Filter/separator.
The fuel filter/separator is provided to allow water to be
drained from the fuel system. Water is heavier than fuel
so any water contained in the system will collect in the
bottom of the bowl.
The clear bowl ‘D’ should be checked on a daily basis
and if water is present, it should be drained from the
separator.
Place a suitable container under the separator to prevent
any spillage inside the machine.
Slacken the drain valve ‘E’ until water drains from the
vent tube.
When all the water has been evacuated, tighten the drain
valve ‘E’ and follow the “fuel system air bleeding”
procedure.
Fuel System Air Bleeding
The entry of air into the fuel system will cause difficult
engine starting or engine malfunction.
When carrying out service procedures such as emptying
the fuel tank, draining the filter/separator, and changing
the fuel filter element be sure to bleed air from the fuel
system.
To activate the “automatic air-bleeding system”, turn the
key switch to the “ON” position and energize the
electromagnetic pump” to bleed the air.
Air bleeding method:
When the “starter switch” is set to the “ON” position to
activate the electromagnetic pump, fuel is forced to the
fuel valve of each injection pump and then to the leak-off
pipe of each injector nozzle, so that any air in the fuel
system bleeds off automatically to the fuel tank.
NOTE: Although the fuel system can bleed air
automatically when the key switch is in the
“ON” position, air can also be manually bled
by use of the primer pump facility in the filter/
separator assembly.
By unscrewing the plastic primer pump head ‘A’ and
stroking it up and down, any air bubbles in the system will
be purged back to the fuel tank. When this has been
completed, the pump head must be screwed back into
the filter/separator assembly.
Start the engine and visually check the fuel system for
leaks.
Replacing fuel filter
Replace the fuel filter at specified intervals before it is
clogged with dust to adversely affect the fuel flow. Also,
replace the fuel filter after the engine has fully been
cooled.
1) Remove the fuel filter using a filter wrench(customer
procured). When removing the fuel filter, hold the
bottom of the fuel filter with a piece of rag to prevent
the fuel oil from dropping. If you spill fuel, wipe such
spillage carefully.
2) Clean the filter mounting surface and slightly apply
fuel oil to the gasket of the new fuel filter.
3) Install the: new fuel filter manually turning until it
comes into contact with the mounting surface, and
tighten it further to 1/2 at a turn, using a filter wrench.
Tightening torque: 11.8~15.6N•m(1.2~1.6kgf•m).
Applicable fuel filter Part No.CCN 46697108
A. Engine oil filter C. Tighten
B. Loosen