Bendix Commercial Vehicle Systems R-14 RELAY VALVES 5/10 - Manual (Page 3)

3
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A
warranty may be voided if intrusive maintenance is
performed during the warranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuable guide in determining the best maintenance interval
for air brake system components. At a minimum, the valve
should be inspected every 6 months or 1500 operating
hours, whichever comes fi rst, for proper operation. Should
the valve not meet the elements of the operational tests
noted in this document, further investigation and service
of the valve may be required.
OPERATIONAL AND LEAKAGE TEST
1. Chock the wheels, fully charge the air brake system
and adjust the brakes.
2. Make several brake applications and check for prompt
application and release at each wheel.
3. Check for inlet valve and o-ring leakage.
A. Make this check with the service brakes released
when the R-12 ® or R-14 ® valve is used to control
the service brakes.
B. Make the check with the spring brakes applied
(PARK) when the R-14 ® valve is used to control the
spring brakes. Coat the exhaust port and the area
around the retaining ring with a soap solution; a 1”
bubble in 3 seconds leakage is permitted.
4. Check for exhaust valve leakage.
A. Make this check with the service brakes fully applied
if the R-12 ® or R-14 ® valve control the service
brakes.
B. Make this check with the spring brakes fully
released if the R-14 ® valve is used to control the
spring brakes. Coat the exhaust port with a soap
solution; a 1” bubble in 3 seconds leakage is
permitted. Coat the outside of the valve where the
cover joins the body to check for seal ring leakage;
no leakage is permitted.
5. If the R-14 ® valve is used to control the spring brakes,
place the park control in the released position and
coat the balance port with a soap solution to check
the diaphragm and its seat. Leakage equivalent to a
1” bubble in 3 seconds is permitted.
Note: If the anti-compound feature is in use, the line
attached to the balance port must be disconnected to
perform this test.
If the valves do not function as described above, or if
leakage is excessive, it is recommended that the valves
be replaced with new or remanufactured units or repaired
with genuine Bendix
® parts, available at any authorized
Bendix ® parts outlet.
REMOVAL AND INSTALLATION
REMOVAL
1. Block and hold vehicle by means other than air brakes.
2. Drain air brake system reservoirs.
3. If entire valve is to be removed, identify air lines to
facilitate installation.
4. Disconnect air lines from valve*.
5. Remove valve from reservoir or if remotely mounted,
remove mounting bolts and then valve.
*It is generally not necessary to remove entire valve to
service the inlet/exhaust valve. The inlet/exhaust valve
insert can be removed by removing the snap ring, exhaust
cover assembly and then inlet/exhaust valve.
Caution: Drain all reservoirs before attempting to remove
the inlet exhaust valve.
DISASSEMBLY
Note: Prior to disassembly, mark the location of the
mounting bracket to the cover and the cover to the body.
1. Remove the four (4) cap screws and lockwashers
securing the cover to the body.
2. Remove the cover, sealing ring, and mounting bracket.
3. Remove the piston and o-ring from the body.
4. While depressing the exhaust cover, remove the
retaining ring and slowly relax the spring beneath the
exhaust cover.
5. Remove the exhaust cover assembly and o-rings.
6. Remove the inlet/exhaust valve return spring from the
body.
7. Remove the inlet/exhaust valve from the body.
8. Remove the valve retainer from the inlet/exhaust valve.
9. Remove the Phillips head screw and exhaust cover
from the R-14 ® valve cover.
10. Remove the service port cap nut and o-ring from the
R-14 ® valve.
11. Remove the diaphragm from the R-14 ® valve cover.
CLEANING AND INSPECTION
1. Wash all metal parts in mineral spirits and dry them
thoroughly.
(Note: When rebuilding, all springs and all rubber parts
should be replaced.)
2. Inspect all metal parts for deterioration and wear, as
evidenced by scratches, scoring and corrosion.
3. Inspect the exhaust valve seat on the relay piston for
nicks and scratches which could cause excessive
leakage.
4. Inspect the inlet valve seat in the body for scratches
and nicks, which could cause excessive leakage.