Bendix Commercial Vehicle Systems MC-12 MODULATOR CONTROLLER ASSY - Manual (Page 7)

7
REMOVAL OF THE MC-12 ™ MODULATOR
ASSEMBLY
1. Remove and identify all air lines connected to the unit.
2. Disconnect the 14 pin connector from the unit by
loosening its screw and pulling the connector away from
its socket.
3. Remove and save the mounting hardware connecting
the MC-12 ™ modulator to the vehicle.
4. 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.
INSTALLATION OF THE MC-12 ™
MODULATOR ASSEMBLY
1. Replace the MC-12 ™ modulator 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 screw.
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.
CAUTION: The MC-12 ™ modulator may be lightly clamped
in a bench vise during disassembly. However, over clamping
will result in damage, leakage, and/or malfunction. If a vise
is to be used, position the MC-12
™ modulator so the jaws
bear on the flat area of the supply port and its opposing side
of the body.
1. Remove the EC-12 ™ 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 by
depressing the lock tab on the side of the connector
and pulling the connector from its socket in the controller.
Remove the gasket (7) from the EC-12
™ controller body.
NOTE: If replacement of the controller only is required,
proceed to Step 8 of assembly.
3. Remove sealing ring (4) from the protrusion on the bottom
of the solenoid assembly.
4. 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 l.D. and O.D.,
respectively, of the exhaust assembly.
5. Remove spring (10). Remove the inlet/exhaust assembly
(8). Remove the spring seat (9) from the inlet/exhaust
assembly.
6. 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.
7. Discard all items that have replacement parts in the
maintenance kit.
CLEANING & 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. FIGURE 9 - EXPLODED VIEW
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