2
The optional lever type valves housed in the auxiliary control
module consist of one or two lever type valves which may be
used to control any on/off type auxiliary devices such as a
sliding fifth wheel, inter-axle lockout, etc.
The function as the lever type valves is similar to the Bendix
®
TW-1
™
control valve. One or both of the valves may be utilized
and, if required, a nonfunctional spool insert may be replaced
by a functional spool insert at any time. Port identification
for the push-pull module is shown on Fig. 6 and for the
auxiliary module on Fig. 9.
OPERATING MODE
V-1
V-2
V-3
NORMAL RUN
BUTTON IN. DELIVERY
BUTTON IN. DELIVERY TO
BUTTON OUT. UPPER
SUPPLIES BOTH SECTIONS
TRACTOR SPRING BRAKES
PORTION BLOCKS SUPPLY
OF V-3 (PP-8
™
AND SV-1
™
AND TO PILOT SECTION
AIR FROM V-1.
VALVE).
OF PILOT VALVE (SV-1
™
).
LOWER PILOT VALVE
TRACTOR BRAKES
(SV-1
™
) HELD OPEN BY
RELEASED.
DELIVERY FROM V-2
PERMITTING V-3 DELIVERY
TO TRAILER SUPPLY LINE.
TRAILER BRAKES
RELEASED.
SYSTEM PARK
BUTTON IN. DELIVERY
BUTTON OUT. EXHAUSTS
BUTTON OUT. UPPER
(POSSIBLY AUTOMATIC IF
SUPPLIES BOTH SECTIONS
AIR FROM TRACTOR
PORTION BLOCKS SUPPLY
SUPPLY PRESSURE IS
OF V-3 (PP-8
™
AND SV-1
™
SPRING BRAKES AND
AIR FROM V-1.
LOW.)
VALVE).
FROM PILOT SECTION OF
LOWER PILOT VALVE
PILOT VALVE (SV-1
™
).
(SV-1
™
) IN EXHAUST
TRACTOR BRAKES
POSITION EXHAUSTING AIR
APPLIED.
FROM TRAILER SUPPLY
LINE. TRAILER BRAKES
APPLIED.
TRAILER PARK
BUTTON OUT. EXHAUSTS
BUTTON IN. DELIVERY TO
BUTTON IN OR OUT. NO
(POSSIBLY AUTOMATIC IF
ALL SUPPLY AIR FROM V-3
TRACTOR SPRING BRAKES
SUPPLY AIR.
SUPPLY PRESSURE IS
(PP-8
™
AND SV-1
™
AND PILOT SECTION
PILOT VALVE (SV-1
™
) IN
LOW.)
VALVE).
(SV-1
™
). TRACTOR BRAKES
EXHAUST POSITION
RELEASED.
VENTING TRAILER
SUPPLY LINE.
TRAILER BRAKES
APPLIED.
TRAILER RE-SUPPLY
BUTTON IN. DELIVERY
BUTTON OUT. EXHAUST
BUTTON IN. SUPPLY AIR
SUPPLIES BOTH SECTIONS
AIR FROM TRACTOR
FROM V-1 IS DELIVERED
OF V-3 (PP-8
™
AND SV-1
™
SPRING BRAKES AND
THROUGH UPPER CAVITY
VALVE).
FROM PILOT SECTION
TO TRAILER SUPPLY LINE.
(SV-1
™
).
TRAILER BRAKES
TRACTOR BRAKES
RELEASED.
APPLIED.
FIGURE 2 - MODUTROL OPERATING MODES
