4
Section 250-0000
Braking System - Air Braking System Schematic
SM 1948 4-00
Parking Brake Actuator (15) - Applies disc type
parking brake when park/emergency control valve
lever is moved into the 'PARK' position by exhausting
the air in the actuator.
Brake Light Switch - Turns on the brake lights when
the brakes are applied.
Warning Lights (Air System)
The following warning lights are controlled by pressure
switches and are located on the warning light panels in
the operators compartment:
Note: Refer to operators handbook for location and
identification of warning lights.
Low Brake Air Pressure (Red) - Illuminates if air
pressure falls below approximately 4.1 bar (60 lbf/in
2
).
If light illuminates while operating, stop the machine,
apply the parking brake and do not operate until the
fault has been corrected.
Parking Brake (Green) - Illuminates until the park/
emergency control lever is placed in either the
'EMERGENCY' or 'RELEASE' positions indicating that
the parking brake is released.
Tractor Brakes Overstroke (Red) - Illuminates if the
front brake system pressure is low. A buzzer also
sounds. If light illuminates, stop the machine and
investigate the cause.
Trailer Brakes Overstroke (Red) - Illuminates if the
rear brake system pressure is low. A buzzer also
sounds. If light illuminates, stop the machine and
investigate the cause.
OPERATION
Numbers in parentheses refer to Fig. 1.
Air from the engine driven air compressor (2) travels
through air drier kit (3) via pressure protection valve
(9) and into all three air tanks (5, 6 & 10).
Air flows from primary tank (5) to the park/emergency
brake valve (8). Air from front brake tank (6) flows to
the supply port of treadle valve (4), and, to port '21' of
pressure protection valve (9). The rear brake tank (10)
supplies air to the rear relay valve (11). Air is supplied
to the auxiliary components via port '23' of the
pressure protection valve (9).
Air compression is controlled by unloader valve on air
drier (3) stopping and starting delivery of air from air
compressor (2) when maximum 8.4 bar (122 lbf/in²)
and minimum 6.5 bar (95 lbf/in
2
) pressures are
reached.
The pressure in the system should not exceed
8.4 bar (122 lbf/in²) if the system is operating normally.
However, if unloader valve malfunctions and the
pressure continues to rise, safety valve on air drier (3)
will open to protect the air system by relieving the
pressure at 10.7 bar (155 lbf/in²).
Service Brake
Depressing treadle valve (4) allows air to flow directly
from front brake tank (6) into the air chamber part of
front pressure converter (13). This applies pressure to
the brake hydraulic fluid to apply the front service
brakes. At the same time, air flows through the service
ports of rear relay emergency valve (11). This causes
rear relay emergency valve (11) pistons to move and
unseat their inlet valves allowing the air from rear
brake tank (10) to flow into the air chamber part of rear
pressure converter (13). This applies pressure to the
brake hydraulic fluid to apply the rear service brakes.
The amount of air that flows to pressure converters
(13) depends on how far treadle valve (4) pedal is
depressed. The farther the pedal is depressed the
greater the air pressure released by relay emergency
valve (11), and the greater the braking force.
The brakes are released when the treadle pedal is
released. Application pressure is exhausted through
relay emergency valve (11) exhaust port. Air pressure
is exhausted through treadle valve (4) exhaust port.
Park/Emergency Control Valve
Air line from port 'E' on primary tank (5) directs a constant
supply of air to park/emergency control valve (8), via
pressure protection valve (9), from primary tank (5).
With park/emergency control valve (8) lever in the
'RELEASE' position, air flows from ports 'A' and 'C'.
The air from port 'A' flows to parking brake actuator
(15), preventing the spring in the actuator from
applying the parking brake. The air from port 'C' flows
to the emergency port of rear relay emergency valve
(11). For operation of relay emergency valve, refer to
Section 250-0280, RELAY EMERGENCY VALVE. The
park/emergency control lever should always be in the
'RELEASE' position when driving the machine.
With park/emergency control valve (8) lever in the
'EMERGENCY' position, port 'B' is vented through port
'C'. This allows the air in the lines from brake tank (10)
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