8-36
Published 01-14-2021 Control # 707-01
CARRIER
TMS9000-2 SERVICE MANUAL
Disassemble the brake valve and clean and inspect all parts.
Park Brake Control Valve
Removal
1.
Chock the wheels and completely depressurize both
systems.
2.
Remove the hardware securing the front console cover
and remove the cover.
3.
Tag and disconnect the air lines connected to the park
control valve. Tag and disconnect the electrical leads
from the pressure switch screwed into the valve.
4.
Remove mounting screws.
5.
Unscrew pressure switch from the valve if new valve is
to be installed.
Installation
1.
If removed, install the pressure switch in the valve port.
2.
Install mounting screws.
3.
Connect the air lines to the valve and the electrical leads
to the pressure switch as per removal tags.
4.
Install the front console cover and secure with the
attaching hardware.
Operating and Leakage Check
NOTE:
Replace malfunctioning or leaking parking brake
valve.
1.
Chock the wheels and pressurize the air system.
2.
With the park brake valve plunger pulled out (exhaust
position), coat the exhaust port and plunger stem with a
soap solution. A 25 mm (1 in) bubble in five seconds is
permissible. No leakage is permitted between the upper
and lower body.
3.
Push the park brake valve plunger in (applied position).
A 25 mm (1 in) bubble in three seconds is permitted.
4.
Reduce the air pressure and observe the park brake
valve plunger. It should pop out when the air pressure
drops to about 280 kPa (40 psi) exhausting the delivery
line and engage the park brakes.
Preventive Maintenance
Every 300 hours, 16,000 km (10,000 mi) or 3 months.
Perform the procedures under the Operating and Leakage
Check.
BRAKES
Description
NOTE:
For more in depth information on Bendix system
components go to the Bendix website and
download the appropriate document.
Air Supply
The vehicle’s compressor, see Air Compressor, page 8-27,
takes in filtered air at an increased pressure from the intake
manifold and compresses it. The compressed air is delivered
to the air dryer where water and a small amount of oil is
removed. The air then travels into the rear brake system
reservoir and a front brake system reservoir as well as any
attached trailer reservoirs. For each system, the air
pressurizes the reservoir and the air hoses all the way to the
next control valve, where the air pressure remains, ready to
be used.
A vehicle may use compressed air for many tasks. Some
examples are: to provide force for braking, to deliver air to
the air suspension system, etc.
Normal Braking
When the driver applies the foot brake, the air pressure is
delivered to the rear and front brake systems. This air travels
through the delivery (in this case signal) line to the relay
valve. This closes the exhaust and opens the delivery of air
to the brakes.
The pressure quickly increases in the brake chambers and
applies force to the push rod, transferring the force to the S-
Cam. When the brakes are released, the air in the brake
chambers is able to be quickly released.
Vehicle Parking
Vehicles are parked using powerful springs, which are part of
the spring brake assembly, to engage the brakes and hold
the vehicle in position. When the driver prepares to move
away and releases the parking brake, the spring force is
countered by the introduction of air pressure. An anti-
compounding valve in the system design helps prevent the
application of both the spring and service brakes together.
Anti-lock Braking Systems (ABS)
This Grove crane uses an electronic Anti-lock Braking
System (ABS) to help improve braking when excessive
wheel slip, or wheel lock-up, is detected. Electronic Control
Units (ECUs) monitor wheel speeds (on all wheels equipped
with speed sensors) and use ABS modulator valves to adjust
or pulse the braking force being applied. These valves
operate many times per second during an ABS event. ABS
typically improves stability and steerability, and also reduces
stopping distances on most surfaces.
Fo
r
Reference
Only
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