IMPLEMENT HYDRAULIC SYSTEM CONTINUED
N OT E
Refer to Machine Electrical System and Electro-Hydraulic Controls in this work package
for additional machine ECM inputs and outputs not shown here.
Table 2. Machine ECM Inputs and Outputs.
Blade Shake Button
This button activates the blade shake feature.
The machine ECM is located behind the right rear access door
above the batteries. The machine ECM controls the engine
starting system, machine hydraulic systems, A/C system, and
backup alarm operation using programmed memory and
sensor and switch data as described throughout this work
package. The machine ECM communicates with the engine
ECM and equipment ECM by means of the Controller Area
Network (CAN) bus.
Each of these solenoid valves is designed to control pilot
lower, blade tilt left, blade tilt right,
pressure to the main control valve, which then controls the
auxiliary valve #1 port A, auxiliary
rate of flow of hydraulic oil to the implement circuit.
valve #1 port B, and winch brake (D6K
The machine ECM adjusts the solenoid valves according to
requests made by the operator through the operator controls.
The ECM uses a pulse width modulated (PWM) signal to vary
current to the solenoid. The solenoid receives electrical
current from the machine ECM. The solenoid plunger then
travels a distance in proportion to the electrical current sent
from the machine ECM. The electrical current to the solenoid
controls the position of the valve.
The pilot solenoid valves are used for blade raise, blade lower,
blade tilt left, and blade tilt right. The solenoids modulate the
flow of pilot oil that causes the movement of the blade. The
blade float function is achieved when additional electrical
current is applied to the blade lower solenoid, which moves
the valve spool to the float position.
The machine ECM can detect a failure in the solenoid circuit
and record a diagnostic code when a failure is present.
C AU T I O N
The solenoid coils are not designed
to operate using 24 DCV directly. Do
NOT activate the coils by using 24
Direct Current Volts (DCV) (battery
positive). This will reduce the life of
the coils drastically.