Doosan 7/26E, Operation And Maintenance Manual

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74 PERIODICAL INSPECTION AND MAINTENANCE
7/26E, 7/31E, 7/41
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.
Governor Control Seals
As the governor is precisely adjusted, most of the controls are sealed,
please do not break them. Should any adjustment be necessary,
contact your local Doosan branch or distributor.
(3) Inspection of battery
And remember to connect the (-) Negative battery cable (back onto the
battery) LAST.
• Clean the battery terminals
• Check the level of fluid in the battery.
When the amount of fluid nears the lower limit, fill with battery fluid
(available in the market) to the upper limit. If operation continues with
insufficient battery fluid, the battery life is shortened, and the battery
may overheat and explode.
• Battery fluid tends to evaporate more quickly in the summer, and
the fluid level should be checked earlier than the specified times.
• If the engine cranking speed is so slow that the engine does not
start up, recharge the battery.
• If the engine still will not start after charging, replace the battery.
• Remove the battery from the battery mounting of the machine unit
after daily use if letting the machine unit leave in the place that the
ambient temperature could drop at -15°C or less. And store the battery
in a warm place until the next use the unit to start the engine easily at
low ambient temperature.
Follow the instructions an precautions in the manual from the battery
maker.
A. Battery fluid
B. Lower limit
C. Upper limit
NOTE: The company will not accept any warranty claim on an
engine with broken governor seals.
Fire due to electric short-circuit
• Make sure to turn off the battery switch
or disconnect the negative cable (-)
before inspecting the electrical system.
Failure to do so could cause short-
circuiting and fires.
• Always disconnect the (-) Negative
battery cable first before disconnecting
the battery cables from battery. An
accidental “Short circuit” may cause
damage, fire and or personnel injury.
Proper ventilation of the battery area
• Keep the area around the battery Well
ventilated, paying attention to keep away
any fire source. During operation or
charging, hydrogen gas is generated from
the battery and can be easily ignited.
Do not come in contact with battery electrolyte
• Pay sufficient attention to avoid your
eyes. or skin from being in contact with
the fluid. The battery electrolyte is dilute
sulfuric acid and causes burns. Wash it
off immediately with a large amount of
fresh water if you get any on you.
OPTION