Grove
Published 01-14-2021 Control # 707-01
8-27
TMS9000-2 SERVICE MANUAL
CARRIER
8
8.
Apply the service brakes.
9.
All four rear axle brakes should apply. The brake lights
on the rear of the crane should illuminate.
10.
On units equipped with trailing boom, the trailer supply
line should not be evacuated.
11.
Release the service brakes.
Emergency Brake Application
1.
If necessary, start the engine and charge air system to
governor cut-out pressure.
2.
Turn engine off and allow the air pressure to stabilize for
one minute.
3.
Release the park brakes by pushing the yellow knob on
the front console.
4.
Check that all wheels turn freely.
5.
Simulate a full air leak by opening the drain valve in one
of the two secondary reservoirs.
6.
Slowly drain the primary reservoirs.
7.
The yellow knob should automatically “pop” out when
the pressure decreases below 138 to 207 kPa (20 to
30 psi).
8.
On units equipped with trailing boom, the trailer
emergency supply line should be exhausted between
138 to 310 kPa (20 to 45 psi).
Air System Components
Air Compressor
The air compressor (Figure 8-16) is mounted on and driven
by the engine. It provides the source of compressed air for
the operation of the air system components. It is controlled
(cycled on and off) by an air governor.
Air Governor
The air governor is mounted on the air dryer behind the front
bumper under the center decking. The governor senses the
system pressure and when pressure reaches 896 kPa (130
psi) the governor vents the compressor. When pressure
drops to 758 kPa (110 psi), the governor signals the
compressor to start charging again.
Air Dryer
The purpose of the air dryer (Figure 8-16) is to collect and
remove solid, liquid, and vapor contaminates from the air
system. Clean dry air increases the life of the air system and
reduces cost.
Fo
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Reference
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