Fuel System - Kubota D650-B Handbuch

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FUEL SYSTEM
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. . Testing Opening Pressure of Nozzle
1) Move the tester handle up and down to prime fuel.
Measure the pressure of fuel jetting from the nozzle tip.
2) If the measurement is not within the reference value,
adjust with the adjustment washer inside the nozzle
holder. (See page 122) Each extra 0.1 mm (0.0039 in.) of
washer thickness causes an approximate 980.6 kPa
(10 kgf/cm
2 ,
142.2 psi) increase in fuel injection pressure.
(Danger)
• Be careful not to come into direct contact with the
injected fumes.
The fumes destroy any cells they may touch. They may
also cause blood poisoning.
13.7 to 14.7 MPa
Reference value
140 to 150 kgf/cm2
1990 to 2133 psi
f)
Checking Fuel Tightness of Nozzle Valve Seat
1) Apply a pressure 12.7 MPa (130 kgf/cm
2
,
1848.6 psi).
2) After keeping the nozzle under this pressure for 10
seconds, check to see if fuel leaks from the nozzle valve
seat.
3) If fuel should leak, replace the nozzle piece.
Reference value
the pressure is 12.7 MPa (130
kgf/cm 2 ,
the valve seat must be oil·tight.
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