8-57
TMS800E SERVICE MANUAL UNDERCARRIAGE
Published 01-29-2014, Control # 496-00
Installation
Screw the switch into the fitting and connect the electrical
leads.
Preventive Maintenance
Every 16,000 km (10,000 mi) or monthly do the procedures
as outlined under Operating and Leakage Checks above.
Stop Light Switch
Operational Test
Depress the brake pedal and observe that the stop lights
illuminate.
Leakage Test
With pressure applied, coat the switch with a soap solution
and observe for bubbles. No leaks are permitted.
Removal
Disconnect the electrical leads and unscrew the switch from
the dual brake valve with a wrench.
Installation
Screw the switch into the dual brake valve with a wrench and
connect the electrical leads.
Air Pressure Gauge
Removal
1. Chock the wheels and completely depressurize both
systems.
2. Remove the hardware securing the cover to the front
console and remove the cover.
3. Gain access to the rear of the air pressure gauge. Tag
and disconnect the nylon tubes from the rear of the
gauge. Tag and disconnect the electrical connector.
4. Remove the hardware securing the gauge to the front
console and remove the gauge.
Installation
1. Install the air pressure gauge in the front console with
the attaching hardware.
2. Connect the two nylon tubes to the fittings in the rear of
the gauge and connect the electrical connector as per
removal tags.
3. Install the front console cover and secure with attaching
hardware.
Functional Check
Start the engine and observe the air pressure gauge. The red
arrow on the gauge (primary) should rise first until a pressure
reading of about 590 kPa (85 psi) at which time the green
arrow (secondary) should begin to climb. Both arrows should
level off at about 7.60 bar (110 psi).
Safety Valve
Removal
1. Chock the wheels and completely depressurize the
system.
2. Using a wrench, unscrew the valve from the fitting.
Installation
Screw the valve into the fitting.
Operating and Leakage Checks
With the system pressurized, pull the valve stem and air
should exhaust from the valve exhaust port. Release the
stem and air flow should stop. Replace the safety valve if it
does not pass the operation test.
Coat the valve and fitting with a soap and water solution and
observe for leaks. Replace the valve if excessive leaking is
present.
Check the valve every 160,000 km (100,000 mi), 3600 hrs,
or yearly.
Tire Inflation Pressure Protection Valve
Removal
1. Chock the wheels and completely depressurize both air
systems.
2. Tag and disconnect the air lines from the pressure
protection valve.
3. Remove the capscrews, nuts and washers securing the
valve to the mounting studs.
Installation
1. Install the valve on the mounting studs and secure with
the capscrews, nuts and washers. Refer to Fasteners
and Torque Values, page 1-13.
2. Connect the air lines as tagged during removal.
Operational Check
NOTE: Replace any pressure protection valve that does
not operate properly.
1. Install a pressure gauge and drain valve at both the
supply and delivery sides of the pressure protection
valve.
2. Pressurize the system and shut off the engine.
3. Slowly exhaust the delivery side of the valve. The gauge
on the supply side should stop while the gauge on the
delivery side should continue to show a pressure loss.
The closing pressure should be 5.90 ± 0.35 bar
(85±5psi).
Reference Only
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