SANY LATIN AMERICA
4-162
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
4.8.1 System operation
When it happens, the controller checks the
signal voltage from the fuel control dial and
sets the engine speed to the speed set by
the fuel control dial.
Engine startup
●
When the start switch is turned to the
START position, the starting signal is trans-
mitted to the start motor. Then, the start
motor rotates to start the engine.
The controller sends a driving signal to the
throttle motor according to the signal volt-
age to control the fuel injection pump, and
eventually controls the engine speed.
ZX215-1002177
C
BR
P
M
s
Lo
Lo
Hi
Hi
B
P
P
E
E
E
B
L
SW
S
B
s
(Regulating signal
Engine
(Power)
Controller
(Start switch ON signal)
(Starting signal)
Start S/W
Fuel ctrl dial
Throttle On
Governor
motor
Alternator
Bat. relay
Lock
relay
Shutdown
device
Shutdown
relay
(Starting signal)
Safety
relay
Drive signal
(Potentiometer singal)
Throttle Off
Pilot S/W
Start motor
Starting relay
ZX215-1002178
C
BR
P
M
s
Lo
Lo
Hi
Hi
B
P
P
E
E
E
B
L
SW
S
B
s
Throttle On
(Regulating signal
Governor
motor
Alternator
Bat. relay
Lock
relay
Engine
(Power)
Controller
(Start switch ON signal)
Start motor
Shutdown
device
Shutdown
relay
(Starting signal)
(Starting signal)
Safety
relay
Drive signal
(Potentiometer singal)
Throttle Off
Starting relay
Pilot S/W
Start S/W
Fuel ctrl dial
ZX215-1002179
C
BR
s
Lo
Lo
Hi
Hi
B
P
P
E
E
E
B
L
SW
S
B
s
Throttle On
(Regulating signal
Governor
motor
Alternator
Bat. relay
Lock
relay
Engine
(Power)
Controller
(Start switch ON signal)
Start motor
Shutdown
device
Shutdown
relay
(Starting signal)
(Starting signal)
Safety
relay
Throttle Off
Starting relay
Pilot S/W
Start S/W
Fuel ctrl dial
Engine speed control
●
The fuel control dial sends a signal voltage
corresponding to the rotation angle to con-
troller.
Engine shutdown
●
When the start switch is turned to the OFF
position, the shutdown device cuts off the
fuel supply and stops the engine.
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