Check plunger retainer spring and valve spring
Valve body must be replaced if seat is worn
excessively or damaged.
Install new grommet on plunger.
Apply a small amount of the lubricant listed in
LUBRICANT SPECIFICATIONS, Item 1, on the
plunger and insert plunger return spring and
plunger in the body. Plunger must move freely
with only a slight drag due to grommet. Depress
plunger and then release; plunger spring must
Apply a lubricant comparable to that listed in
LUBRICANT SPECIFICATIONS, Item 1, to cap
nut grommet and position grommet on cap nut.
Position valve and valve spring in valve body 5.
Install cap nut in valve body.
Position lever on top of plunger and align hole in
lever with hole in body.
Install lever pin and stake edge of hole.
Install jam nut and button on push-pull type
valve. Install bracket on remote control (cable-
operated) type valve.
MODULAR CONTROL VALVE
(BENDIX TYPE MV-2)
The modular control valve (Fig. 4 ) provides the
functions of a standard three (3) valve combination plus
a supply reservoir selection. The major features are:
Tractor protection control.
Complete system park.
Trailer park only.
Trailer charge with tractor spring brakes applied
(tractor park only).
Supply reservoir selection (two way check valve).
Fig. 4 Modular Control Valve
The bodies for the module, as well as "spool" inserts,
are molded of a non-metallic, noncorrosive material. The
assembly consists of two push-pull valves and a dual
circuit supply valve which triggers at a pre-set pressure
differential. The valve "spool" inserts, as well as the dual
circuit supply valve spool and shuttle, may be removed
from the valve bodies without disconnecting the air lines.
The MV-2 valve includes a spring loaded dual circuit
supply (double check) valve which selects, as the air
source for both control valves, the primary reservoir at all
times unless the pressure in the primary reservoir falls
not more than 207 kPa (30 psi) below that of the
secondary reservoir, when the dual circuit supply valve
will shuttle and establish the secondary reservoir as the
supply. An auxiliary air delivery port is also available
which receives its supply from the dual circuit supply
valve. All air connections are at the bottom of the valve,
as shown in Fig.
including the auxiliary air delivery port.
The trailer air supply valve or tractor protection
control (red knob) (see Fig. 4 ) delivers air to the trailer
supply line and also will trip (pop out) automatically and
shut off the trailer supply if pressure decreases to 276
27.6 kPa (40 5 psi).
Reservoir No. 1 must be the reservoir that supplies the
primary brake system.
Reservoir No. 2 must be the reservoir that supplies the
secondary brake system.
CTS-4079 - CHAPTER VII - Page 6