Operation & Maintenance Manual──LG956L Wheel Loader
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valve will jump out automatically to cut down the air way, so that the emergency brake is utilized to
protect the safety of vehicle and people.
3.4 Emergency and Parking Brake System (Electric Air Control Caliper
Disk)
As shown in Figure 5-4, this system employs the electric air control caliper disk brake system. During
driving, rotate the operating button of brake electromagnetic valve 7 slightly, the button will bounce
out automatically, and then the compress air in the air tank 4 through the brake electromagnetic valve
7 to the parking brake air chamber 8 to pull the plug away and release the brake; When stopping,
press the operating button of brake electromagnetic valve 7, the compress air in the parking brake air
chamber 8 through the air draining port of brake electromagnetic valve to aerospace. Then the brake
is pulled up under the spring to arrive to brake. The parking brake indicator lamp controlled by output
air pressure is lightened at the same time and cut off the power of transmission box.
When the system air pressure is lower than 0.4Mpa, the brake electromagnetic valve will cut off
automatically to control the compress air in the parking brake air chamber 8 to drain into the
aerospace by hand, so that the emergency brake is utilized to protect the safety of vehicle and people.
4 ELECTRIC SYSTEM
The electric system is composed of a storage battery, starting motor, charge generator, appliance,
switch, lamps, air conditioning circuit and other electric instruments.
The system of this machine employs D.C. 24V voltage, negative electrode and single wire lines. The
relation of each electric instrument and their working theories refer to the diagram sketch of the
electric system as is shown in figure 5-6, 5-7, 5-8and 5-9.