MCi Crusader II 1989 Maintenance Manual page 136

Date 1-1-89
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MC-9 MAINTENANCE MANUAL
MAINTENANCE
Every year or after 50,000 miles (80,000 km) the inversion
valve should be disassembled, cleaned and lubricated. Rubber
parts should be replaced and any other parts which show signs
of wear or damage should also be replaced.
The air at the inversion valve control ports is exhausted
through the control valve exhaust when it is operated. The
piston springs will then cause the piston to move and seat on
the inlet and exhaust valve closing the exhaust passage. The
inlet valve is moved off
its
seat by the piston exhaust seat so
supply air from the isolated reservoir will pass by the open inlet
and out the delivery ports.
When the application is released by actuating the control
valve. air passes into the inversion valve control port The piston
moves away from the inlet and exhaust valve. opening the
exhaust passage through the piston. The inlet valve closes the
air in the delivery ports exhausts· through the center of the
piston stem and out the inversion valve exhaust port.
REMOVAL AND INSTALLATION
1. Block and hold the vehicle by means other than air brakes.
2. Vent the service and isolated reservoir supplies. Discon-
nect all air lines from the inversion valve.
3. Loosen the valve mounting nut and remove the valve.
Prior to installation, check and clean the air lines to the valve.
Mount the valve securely with mounting nut and lockwasher.
DISASSEMBLY
1. Refer to figure 4-6. Remove the cap nut with 0-ring and
remove the 0-ring from the cap nut Remove the inlet valve
spring and inlet valve.
t.
Nut
2. Lock Washer
3.
Cap Nut
4. O-Ring
S. Valve Spring
S. Valve
7.
Body
8. O-Ring
9.
Piston
2. Turn the valve over and remove the exhaust check valve
diaphragm screw, then diaphragm washer and diaphragm.
3. Remove the retaining ring. Remove the cover plate and
two piston springs.
4. Remove the piston. Remove the piston 0-rings.
REPAIR
1. Wash all metal parts
in
cleaning solvent and wipe plean.
Inspect all parts for excessive wear or deterioration.
2. Check springs for cracks. corrosion. or distortion. Inspect
the piston and its exhaust seat. body bores and inlet valve seat
for nicks or burrs.
3. Replace all parts not considered serviceable.
REASSEMBLY
Before assembling the valve. lubricate the piston. 0-rings
and body bores.
1. Install the piston with 0-rings in the valve body.
2. Position piston springs. cover plate and retainer ring in the
piston in that order.
3. Press the cover and retainer down and snap the ring into
the body groove.
4. Install the diaphragm and diaphragm washer and secure
with the cap screw.
5. Turn the inversion valve over and position the inlet and
exhaust valve in its bore. Place the spring down over the inlet
valve.
6. Install the 0-ring on the capnut Install the capnut with the
0-ring and tighten securely. ·
7. The mounting nut and lockwasher are installed when the
valve is mounted on vehicle.
10. 0-Ring
11. Spring
12. Spring
13. Cover Plate
14. Retaining Ring
15. Diaphragm
16. Diaphragm Washer
17. Screw
Figure 4-6. TR-2 Inversion Valve.