5
3. Install o-rings (24 & 13) onto the check valve (23). Then
install the assembly into its cavity in the MV-3
™
valve
body.
4. Install the snap ring (22) making sure it is fully seated in
its groove.
SPOOLS
1. Install o-rings (18,19 & 20) and the exhaust seal (21)
onto the stem of plungers (15).
CAUTION: The exhaust seal (21) must be installed so
that its beveled surface mates with the beveled surface
of the plunger (Figure 8).
2. Install o-ring (16) onto the guide spool (14). Install the
guide spool assembly over the threaded end of the
plunger (15) and press down firmly until it contacts the
plunger flange.
3. Install spring (12) over the boss in the bottom of the
spool cavity in the body of the MV-3
™
valve. Place the
spool assembly into the body, keeping the spool square
to the body press and turn the stem until the spool is
fully seated in its cavity. Note the assembly is keyed
and may only be installed one way.
FIGURE 8 - PLUNGER AND EXHAUST SEAL
I.D.
BEVEL
21
EXHAUST SEAL
20
O-RING
MATING
EXHAUST
SEAL
BEVEL
19
O-RING
18
O-RING
15
PLUNGER
4. Repeat Steps 1, 2, and 3 with the remaining components
for the opposite spool.
SHUTTLE AND CHECK VALVE
1. Install o-ring (11) into its groove on the piston (7) and
o-ring (6) onto the cap (5).
2. Install spring (8) on the piston (7) and spring (9) on the
boss of the check valve (10).
3. Install the spring and check valve into its cavity in the
body of the MV-3
™
valve (tapered end of check valve to
enter cavity first). Make sure the spring (9) is centered
in the bore.
4. Install the piston assembly into the cavity making sure
the spring (9) mates with the bore of the piston.
5. Install the cap (5) with o-ring (6).
FINAL ASSEMBLY
1. Install the cover plate (3) onto the valve body and retain
with the six Phillips head screws. Torque to 30 in. Ibs.
2. Attach the red (1) and yellow (2) buttons onto the threaded
stems of the spools, making sure that they are oriented
correctly as noted in Step 1 of Disassembly procedure.
3. Reattach the MV-3
™
valve to the dash using the hardware
removed in Step 2 of Disassembly. If air lines were
removed during disassembly, reconnect to ports marked
during disassembly. When reconnecting threaded ports
use a liquid thread sealing compound, attach the air line
until it is hand tight and then turn approximately one
and a half turns further (or using a maximum of 10 ft.-
lbs. torque - Note: overtorquing will crack the port).
SERVICE TEST
Repeat the Operational Test procedures. Test drive vehicle
at slow speed in a safe area prior to placing back into service.
