Fuel Pump; Fuel Injection Pump - Kubota D650-B Handbuch

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[AI I nlet stroke
[BI Discharge stroke
(S)
t
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4-2 FUEL PUMP
Filtered fuel is forcibly sucked from the tank by the fuel
pump and fed under pressure to the injection pump. Inlet
and discharge pressures are produced by a vertical movement
of the diaphragm which is caused by the special cam (for
pump) of the fuel camshaft. Fuel is suctioned on the down ­
ward stroke, and discharged on the upward stroke. A system
of two valves allows fuel to flow in only one direction.
(1)
From fuel filter
(2)
Inlet valve
(3)
Outlet valve
(4)
Diaphragm
(5)
Fuel camshaft
(6)
To Injection pump
[AI Fuel Injection pump
(1)
121
(31
··~-(91
(4)
(5)
17)
(81
OOllF040
(9)
4-3 FUEL INJECTION PUMP
The well-known Bosch K type mini pump is provided, it
features high injection quality even at low engine speed. The
fuel injection pump plunger is reciprocated by the fuel cam­
shaft which is driven by the crankshaft thmugh a system of
timing gears. Fuel camshaft rpm is 1/2 of camshaft rpm.
(11
Delivery valve holder
(2) Delivery valve spring
(3)
Delivery valve
(4)
{51
Plunger }
C
r
d
V
In
er
Pump element
(6)
Control rack
(7)
Tappet
(8)
Plunger spring
(9)
Air vent screw
00 76FOl5
66