UNDERCARRIAGE TMS700E SERVICE MANUAL
8-60 Published 01-29-2015, Control # 512-01
Preventive Maintenance
Every 300 hours, 16,000 km (10, 000 mi), or monthly.
1. Check the relay valve for leakage and proper operation.
Every 3600 operating hours, 160,000 km (100,000 mi), or
annually.
Disassemble the valve, clean and inspect all parts. Repair
and replace as necessary.
Dual Brake Valve
Removal
1. Chock the wheels and completely depressurize both air
systems.
2. Tag and disconnect all air lines connected to the brake
valve.
3. Remove the three nuts, washers, and lockwashers
securing the valve to the mounting studs and remove the
brake valve and pedal assembly.
Installation
1. Position the brake valve and pedal assembly onto the
studs under the front console and secure with three
nuts, washers, and lockwashers.
2. Connect all the air lines to the brake valve per removal
tags.
Operating Test
1. Check the delivery pressure of both #1 and #2 circuits
with a test gauge. Depress the treadle to several
positions between fully released and applied. Check the
pressure on the gauges to see if it varies equally and
proportionately with the movement of the brake pedal.
2. After the brakes are released, the reading on the test
gauges should fall off to zero. The delivery pressure in
#1 circuit should be 0.30 bar (4 psi) greater than #2
circuit with both supply reservoirs at the same pressure.
Leakage Test
1. Make and hold a high pressure application of 5.50 bar
(80 psi).
2. Coat the exhaust port and body of the brake valve with a
soap solution. A leakage of a 25 mm (1 in) bubble in
three seconds is permitted.
Preventive Maintenance
Every 300 operating hours, 16,000 km (10,000 mi), or three
months.
1. Clean dirt away from the heal of the treadle, plunger
boot, and mounting plate.
2. Lubricate the treadle roller, hinge pin, and roller pin
using a barium base lubricant.
3. Check the rubber plunger boot for deterioration and
replace as necessary.
4. Lubricate the plunger with a barium base lubricant.
Every 3600 operating hours, 160,000 km (100,000 mi), or
yearly.
Replace inlet and exhaust valves, exhaust diaphragm, O-
rings, and rubber graduating spring if worn or deteriorated.
Every 7200 operating hours, 320,000 km (200,000 mi) or two
years.
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. Drive out the roll pin securing the knob to the valve stem.
5. Loosen and remove the valve mounting nut and remove
the valve from the console panel.
6. 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. Position the valve through the hole in the console and
secure with the valve mounting nut.
3. Push the knob onto the valve stem and secure with the
roll pin.
4. Connect the air lines to the valve and the electrical leads
to the pressure switch as per removal tags.
5. Install the front console cover and secure with the
attaching hardware.
CAUTION
A change in braking characteristics or low air pressure
may be an indication of a malfunction in one of the brake
circuits. Do not operate the vehicle until repairs have been
made and both circuits are operating properly. Always
check brakes after servicing.
Reference Only
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