ENGINE
1-Air
vent screw
2-Stopper
3-Control rack
4-Return spring
5-Gasket
6-"0"
ring
7-Plunger
8-
Lower seat
9-Tappet
lO-Valve holder
10
II
12
13
14
~---'5
11-Spring
12-Del ivery valve
13-Valve seat
14-Plunger barrel
15-Adjusting plate
16-Contr'ol
pinion
17-Upper seat
16
17
18
19
.18-Plunger spring
19-Pump body (housing)
Injection
pump
-
Cross
section
..
Smoke-set device
The smoke set
unit
restricts the maximum
fuel injection rate from the injection pump and
reduces the
amount
of
exhaust smoke.
The stopper is held
by
a spring in the illustrated
position. This position
is
the
smoke set position.
When starting the engine, pull the speed control
lever fully toward the maximum speed, and the
tie
rod
(with the stopper spring) moves the
control rack, which overcomes the spring force
and moves in the direction
of
the arrow, thus
allowing over-injection for easy engine starting.
On engines with an ungleich device described
under
the following item
c,
however, the opera-
tions described
under
item d are required.
Ungleich Device
When an overload
is
imposed
on
the engine
during operation, the engine speed falls and
the function
of
the governor moves the
speed control rack in the direction
that
fuel
injection
is
increased against the smoke set
spring to provide larger
torque.
To
ensure an
optimum increase
of
the injection during
2·34
operation, the ungleich set plate which
con·
trois the
motion
of
the smoke set stopper
is
provided. This injection increase characteris-
tic (ungleich effect
"L")
provides ,proper
torque performance suitable for the work
machine between the
maximum
output
point and maximum torque point.
Resetting Ungleich Device
and
Starting
Engine
To
start the engine, push
the
speed control
lever in
all
the
way in the
stop
direction and
then move
it
to
the
fully opened position,
and the ungleich set plate will be reset and
an excessive injection state created.
Smoke
set
position
Over·
inJection
"Smoke-set"
device
U
ngieich
set
spring
Ungleich Device
l
,
J
L
~
....-.------
Ungleich Effect
"L"
F
dE
CC
fiE
an
ke
pI,
reI
I
FJ
stru
ope
higl
pres
posi
ama
retn
proc
won
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