Bendix Commercial Vehicle Systems INLET REG VALVE COMP 3/04 - Manual (Page 5)

5
FIGURE 9 - INLET REGULATING VALVE
4. Adjust shop air to the IRV ™ valve to 5 psi and allow the
compressor to build the vehicle air system pressure to
governor cut-out and note that the compressor unloads.
With the compressor unloaded increase the shop air
pressure to the IRV
™ valve in 5 psi increments up to 25
psi. Pause 15-20 seconds at each pressure setting and
note that the compressor inlet pressure as indicated by
test gauge ‘A’ is 12 psi or less. If the pressure exceeds
12 psi more than momentarily, the IRV
™ valve should be
repaired or replaced.
Note: The tests described in this step must be made
with the compressor unloaded.
5. Test the function of the IRV ™ valve safety. Turn off the
engine and simultaneously apply shop air pressure to
the IRV
™ valve turbo supply port and to the compressor
inlet (through the inlet adapter 236701). Beginning at 5
psi, slowly raise the pressure at both locations
simultaneously until an exhaust of air is heard at the
IRV
™ valve’s safety valve. Note the pressure on gauge
‘A’ when the exhaust is heard. If exhaust occurs below
18 psi or above 25 psi, the IRV
™ valve must be repaired
or replaced.
REMOVAL
1. Park the vehicle on a level surface and block the wheels
and/or hold the vehicle by means other than the air
brakes.
2. Drain the air pressure from all vehicle reservoirs.
3. Disconnect the turbocharged air line at the 3/4 inch
NPT turbo supply port of the IRV ™ valve.
4. Remove the two cap screws that secure the IRV ™ valve,
then remove the valve itself.
INSTALLATION
1. Install a new gasket on the mounting flange of the IRV ™
valve and using two cap screws secure the IRV ™ valve.
Note: If 5/16 inch cap screws are used to secure the
IRV
™ valve to the compressor inlet, torque the cap screws
to between 125 and 150 pound inches.
2. Reconnect the turbocharged air line to the 3/4 inch NPT
turbo supply port of the IRV ™ valve.
3. Before placing the vehicle in service, close all reservoir
drain cocks and build air system pressure to governor
cut-out.
DISASSEMBLY (FIGURE 9)
The following disassembly instructions are presented for
reference purposes. Actual disassembly should not be
undertaken without having the necessary maintenance kit
and instructions available. Refer to Figure 9 throughout
disassembly.
1. Using an adjustable or two inch wrench remove the cap
nut from the body.
2. Remove the spring and spacer.
3. Remove the large diameter o-ring located beneath the
hex head of the cap nut.
4. Taking care not to damage the roll crimp of the cap nut,
remove the small diameter o-ring which serves as the
valve seat.
5. Gently tap the open end of the valve body on a nonmetallic
surface in order to remove the valve and piston assembly.
6. Remove the large and small diameter o-rings from the
exterior of the valve and piston assembly. NOTE: No
further disassembly of the valve and piston assembly
should be attempted. The detail parts of this assembly
are NON-SERVICEABLE.
7. Using a 3/16 inch Allen wrench, remove the exhaust
plug.
8. Remove the valve spring and valve.
BODY
O-RING
VALVE &
PISTON
ASSEMBLY
SPACER
O-RING
SPRING
VALVE SEAT
(O-RING)
CAP NUT
EXHAUST
PLUG
SPRING
VALVE
O-RING