Bendix Commercial Vehicle Systems MC-11 TRACTOR ANTILOCK 4/04 - Manual (Page 7)

7
REMOVAL OF THE MC-11 ™ ASSEMBLY
1. Prior to disassembly, remove as much contamination
as possible from the exterior of the assembly. Be sure
to keep the contamination away from the open ports.
2. Remove and identify all air lines connected to the unit.
3. Disconnect the 14-pin connector from the unit by
unscrewing its hex screw and pulling the connector away
from its socket.
4. Remove and save the mounting hardware connecting
the MC-11 ™ assembly to the vehicle.
INSTALLATION OF THE MC-11 ™ ASSEMBLY
1. Replace the MC-11 ™ assembly on the vehicle using the
hardware saved during removal. Connect the air lines
to the proper ports, as identified during removal. Connect
the 14-pin connector into the controller and tighten the
hex screw.
2. Perform “OPERATIONAL AND LEAKAGE TESTS”
before placing vehicle back into service.
DISASSEMBLY
The following disassembly and assembly procedure is
presented for reference purposes and presupposes that a
major rebuild of the antilock valve is being undertaken.
Several replacement parts and maintenance kits are
available which do not require full disassembly. The
instructions provided with these parts and kits should be
followed in lieu of the instructions presented here. Refer to
Figure 7 throughout the procedure.
CAUTION: The MC-11 ™ assembly may be lightly clamped
in a bench vise during disassembly. However, overclamping
will result in damage, leakage, and/or malfunction. If a vise
is to be used, position the MC-11
™ assembly so the jaws
bear on the flat area of the supply port and its opposing side
of the body.
1. Remove the EC-11 ™ controller(1) from the M-12 ™
modulator by removing the controller’s four mounting
bolts.
2. Lift the controller off the M-12 ™ modulator and detach
the wire harness from the base of the controller. To detach
the harness, depress the tab on the side of the 4-pin
connector and pull the connector from its socket in the
controller. Remove the gasket(7) from the recess in the
EC-11
™ controller body. NOTE: If replacement of the
controller only is required, proceed to Step 8 of assembly.
3. Remove the four 1/2" bolts that secure the solenoid
assembly(2) to the valve body(3). Separate the solenoid
assembly and valve body.
4. Remove sealing ring(4) from the protrusion on the bottom
of the solenoid assembly.
5. Using a pair of snap ring pliers, remove retaining ring(14).
Remove the exhaust assembly(13). Remove o-ring(12)
and o-ring(11) from the I.D. and O.D., respectively, of
the exhaust assembly.
6. Remove spring(10). Remove the inlet/exhaust
assembly(8). Remove the spring seat(9) from the inlet/
exhaust assembly.
7. Using your thumb, press the piston stem and push the
piston(6) out the opposite end of the body. Remove
o-ring(5) from the piston.
8. Discard all items that have replacement parts in the
maintenance kit.
CLEANING AND INSPECTION
1. Using mineral spirits or an equivalent solvent, clean and
thoroughly dry all parts to be reused. Do not allow mineral
spirits to come into contact with the ECU connector or
solenoids.
2. Inspect the interior and exterior of all parts that will be
reused for severe corrosion, pitting and cracks.
Superficial corrosion and/or pitting on the exterior
portion of the body is acceptable.
3. Inspect the bores for deep scuffing or gouges.
4. Inspect the pipe threads in the body. Make certain they
are clean and free of thread sealant.
5. Inspect all air line fittings and plugs for corrosion. Clean
all old thread sealant from the pipe threads. Any
component exhibiting a condition described in inspection
steps 2 to 5 should be discarded and replaced before
proceeding.
ASSEMBLY
1. Using a lubricant (Bendix Pc. No. 291126) lightly coat
all o-rings and the bores of the valve body.
2. Install spring seat(9) onto the inlet/exhaust valve(8) so
that it covers the rubber seat of the inlet/exhaust valve.
Place the inlet/exhaust valve, large diameter first, into
the M-12
™ modulator’s bottom bore.
3. Install spring(10) over the barrel of the inlet/exhaust
valve(8) so that one end of the spring rests on the spring
seat(9).
4. Install the o-rings(11 & 12) into the respective grooves of
the O.D. and I.D. of the exhaust assembly(13). Place
the large diameter of the exhaust assembly against the
spring(10) and compress the spring until the exhaust
assembly enters the bore of the body and the o-ring(11)
seals against the wall of the bore.
5. Depress the exhaust assembly into the bore until it
exposes the groove for the snap ring(14). Install snap
ring(14) into its groove. Make sure it is fully seated.