Doosan DX60R Shop Manual page 375

Never inject fuel toward you. Since the fuel is injected
at high pressure from the nozzle, it may penetrate the
skin, resulting in injury.
Never inject fuel toward a fire source. Atomized fuel is
highly flammable and may cause a fire or burn skin.
FLYING OBJECT HAZARD!
Always wear eye protection when servicing the engine
and when using compressed air or high-pressure
water. Dust, flying debris, compressed air, pressurized
water or steam may injure your eyes.
Failure to comply may result in minor or moderate
injury.
4. Pump the operating lever of the tester slowly, observing
the pressure reading at the point where the fuel injector
begins spraying fuel (Figure 289). Figure 294 for injector
ID location. See "Fuel System Specifications" on
page -174 for correct pressure readings.
NOTE:
The opening pressure of a new fuel injector will
be approximately 725 psi (5 MPa; 51 kgf/cm
higher than one that has been operated for five
hours or longer.
5. Pump the operating lever slowly to hold the pressure
steady at a point just below the opening pressure and
hold it for 5 seconds. Observe the injector to see that it is
sealing properly and is not "dripping". If fuel leaks from the
return line fitting, check that the nozzle case nut is tight.
Service or replace the injector if fuel continues to leak from
either the return line fitting or nozzle.
6. Pump the operating lever more rapidly to repeatedly "pop"
the injector and observe the spray pattern. The pattern
should be a very fine uniform spray (Figure 290). If a
dripping or an uneven pattern is seen (Figure 291),
service or replace the injector.
If the fuel injector fails any of these tests, it should be
serviced or replaced as necessary. If the pressure is
outside specified limits, adjust the pressure. See
"Adjusting Fuel Injector Pressure" on page -198
Engine
CAUTION
CAUTION
Figure 288
2
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Figure 289
Figure 290
FG009152
FG009004
SP001693
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