User's Manual

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