Injection Nozzle; Governor - Kubota D650-B Handbuch

(AI Injection nozzle
(11
(2)
(3)
191
(4)
(5)
---···(7)
(81----1--...-1
(101
0011 F046
4-4 INJECTION NOZZLE
- - - - _
......
- - - - - - - - - - - - - - - ­
This nozzle is throttle·type. Fuel fed from the pump is
pressurized to push the needle valve up and the fuel is then
injected. The needle valve is pressed by the nozzle spring
through the push rod. Fuel overflow is passed from nozzle
holder center through the fuel overflow nipple and the fuel
overflow pipe to the fuel tank. The injection pressure is
provided 13.7 to 14.7MPa (140 to 150kgf/cm
2
,
1991
to
2133 psi). Injection pressure can be controlled by inserting
shims between nozzle holder body and adjusting washers.
The pressure increases approx. 981 kPa (10kgf/cm
2
,
142psi)
when inserted a 0.1 mm (0.0039in.) shim. Injection nozzle is
also precision finished as is the injection pump, treat it
carefully and protect from water and dust.
(1) Nozzle holder body
(2)
Adjusting washer
(3)
Nozzle spring
(4)
Push rod
151
Retaining nut
(6)
Nozzle body
(7) Needle valve
(8) Combustion chamber
(9) Fuel overflow nipple
(10) Fuel overflow pipe
[AI At start
4-5 GOVERNOR
With centrifugal ball weight system, this
mechanical governor works in the whole
range of speeds. It keeps the engine speed
and controls the engine output.
• At start
When the engine is started, more fuel is reo
quired than in running. At starting, fork
lever 1 is pulled rightward by starter spring
because ball weights have no centrifugal
force. Control rack moves to a position for
overlimit discharging of fuel to assure easy
starting.
(1) Ball weights
(3) Fork lever 1
(2) Start spring
(4) Control rack
72