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Published 01-29-2014, Control # 496-00
UNDERCARRIAGE TMS800E SERVICE MANUAL
Leakage Test
1. Apply a soap solution around the cap of the valve with
the system pressurized and observe for bubbles. A 25
mm (1 in) bubble in three seconds or longer is
acceptable.
2. Disconnect the air line on the delivery side of the valve
and apply a soap solution to the delivery port. A 25 mm
(1 in) bubble in five seconds or more is acceptable.
Preventive Maintenance
Every 900 hrs, 40,000 km (25,000 mi) or 3 months check for
operation and leakage as described above.
Relay Valve
The inlet/exhaust valve assembly can be replaced without
removing the valve. Replacement is as follows.
1. Remove the snap ring/exhaust cover assembly.
2. Pull the insert out and replace.
3. Reinstall the exhaust cover and snap ring.
Removal
1. Chock the wheels and completely depressurize both air
systems.
2. Tag and disconnect all air lines connected to the relay
valve.
3. Remove the bolts and washers securing the valve to the
frame and remove the valve.
Inspection
Inspect all air lines for kinks, cuts, chafing, or deterioration.
Replace lines showing these defects.
Installation
1. Position the valve on the frame and secure with the bolts
and washers.
2. Connect the air lines as per removal tags.
3. Check operation as described under Operating and
Leakage Tests.
Operating Test
1. Chock the wheels and pressurize both systems. Adjust
the brakes.
2. Apply and release the brakes several times and check
for prompt response of the brakes at all wheels.
Leakage Test
1. With dual brake valve released, coat the relay valve
exhaust port with a soap solution to check for inlet valve
and O-ring leakage. A 25 mm (1 in) bubble in five
seconds is permissible.
2. With the dual brake valve applied, check the relay valve
exhaust port for leakage of the exhaust valve.
3. Apply a soap solution around where the relay valve
cover and body meet to check for seal ring leakage. A 25
mm (1 in) bubble in five seconds is permissible.
Preventive Maintenance
Every 300 hours, 1600 km (1000 mi), or monthly:
Check the relay valve for leakage and proper operation.
Every 3600 operating hours, 16000 km (10000 mi), or
annually:
Disassemble the valve, clean and inspect all parts. Repair
and replace as necessary.
Spring Brake Control Valve
Removal
1. Chock the wheels and completely depressurize both air
systems.
2. Tag and disconnect all air lines connected to the valve.
3. Remove the attaching hardware to free the valve.
Remove the valve.
Inspection
Inspect all air lines for kinks, cuts, chafing, or deterioration.
Replace lines showing these defects.
Installation
1. Secure the valve with attaching hardware.
2. Connect the air lines as per removal tags.
3. Check operation as described under Operating and
Leakage Tests.
Operating Test
Block vehicle and hold by means other than vehicle brakes.
Charge air brake system to governor cut-out pressure.
1. Place parking control valve in “park” position. Observe
that spring brake actuators apply promptly. Remove one
line from delivery port of the valve and install test gauge.
WARNING
Death or injury could occur!
Completely depressurize all reservoirs before removing
the insert.
Reference Only
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