8-52
Published 01-29-2014, Control # 496-00
UNDERCARRIAGE TMS800E SERVICE MANUAL
Low Pressure Indicator Switches
The low pressure indicator switches (Figure 8-69) are used
to warn the operator of low pressure in the air systems. One
switch is installed in each system and they are electrically
connected in parallel to illuminate the Low Air Pressure
indicator on the front console in the cab. Observe the dual air
pressure gauge to determine which system is low. The
switch contacts close when the pressure in the system
decreases to 5.17 bar (75 psi).
Stop Light Switch
The stop light switches (Figure 8-70) are installed in the ports
of the dual brake valve and are used to illuminate the stop
lights on the rear of the carrier when the brakes are applied.
There is one switch in each system (primary and secondary)
and they are connected electrically in parallel.
Air Pressure Gauge
The dual air pressure gauge is located on the right side of the
front console. The gauge is a direct reading pressure gauge
with two indicating pointers, red for the primary system and
green for the secondary system. The gauge has a dual scale
calibrated from 0 to 150 psi and 100 to 1000 kPa.
Safety Valve
A safety valve (Figure 8-71) is installed in the air dryer
module to protect the air system against excessive air
pressure buildup. The valve consists of a spring loaded ball
which exhausts the system if the pressure rises above 10.30
bar (150 psi). A second safety valve is installed in the tire
inflation circuit and is set at 12.07 bar (175 psi).
Reference Only
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