BENDIX SD-13-4793 Manuel d'utilisateur télécharger pdf

SD-13-4793

DESCRIPTION

There are two Bendix antilock modulators available from

Bendix Commercial Vehicle Systems LLC, the older M-21

™

modulator and the newer M-22

™

modulator. Both are

functionally the same.

The M-21

™

and M-22

™

antilock system modulators (Figure

1) are essentially high capacity, on/off air valves that

incorporate a pair of electrical solenoids for control. The

solenoids provide the electro-pneumatic interface or link

between the antilock controller electronics and the air brake

system. The modulator can be used to control the braking

function on an individual wheel or two service actuators.

When used to control both service chambers on an axle

or two chambers on the same side of a tandem axle, the

modulator is sometimes mounted ahead of a quick release

valve, which provides quick exhaust of service applications

during normal braking. (Figure 2) In the case of individual

wheel control applications, the modulator is always the

last control valve through which air passes on its way

to the service brake actuator and a solenoid assembly

which contains one normally open solenoid (NOS), one

normally closed solenoid (NCS), and two inlet and exhaust

diaphragm valves. A Packard, three pin, 280 series weather

resistant electrical connector is an integral part of the

modulator solenoid assembly and serves to carry control

commands from the antilock controller to the modulator.

Two, .35 inch diameter, mounting holes are provided for

frame or cross member mounting. The single supply,

delivery and exhaust port on both modulators is identiﬁ ed

with a cast, embossed numeral for positive identiﬁ cation.

Bendix

M-21

™

and M-22

™

AntiLock Modulator Assembly

FIGURE 1 - M-21

™

AND M-22

™

MODULATOR

M-21

™

MODULATOR M-22

™

MODULATOR

SUPPLY

(CAST-IN ID #1)

SUPPLY

(CAST-IN ID #1)

DELIVERY

SUPPLY

MOUNTING

HOLES

DELIVERY

(CAST-IN ID #2)

SOLENOID

CONNECTOR

SUPPLY

DELIVERY

EXHAUST

(CAST-IN ID #3)

SOLENOID

CONNECTOR

MOUNTING

HOLES

DELIVERY

(CAST-IN ID #2)

EXHAUST

(CAST-IN ID #3)

1 2 3 4 5 6 ... 11 12

Résumé du contenu

Page 1 - AntiLock Modulator Assembly

1 SD-13-4793DESCRIPTIONThere are two Bendix antilock modulators available from Bendix Commercial Vehicle Systems LLC, the older M-21™ modulator and

Page 2 - OPERATION

Page 3

Page 4 - ANTILOCK OPERATION

Page 5 - ANTILOCK HOLD

2FIGURE 2 - WHEEL AND AXLE CONTROL SYSTEMSbwThey are as follows; Identiﬁ cation Air Line Connection 1 Supply (incoming air from foot valve or r

Page 6 - PREVENTIVE MAINTENANCE

3FIGURE 3 - M-21™, M-22™ MODULATOR NON-ANTILOCK APPLICATION OF SERVICE BRAKESBRAKE VALVESPRINGSUPPLY DIAPHRAGMSUPPLY SOLENOIDSPRINGEXHAUST DIAPHRAGMEX

Page 7 - VALVE INSTALLATION

4NON-ANTILOCK EXHAUSTThe manner in which air exhausts through the modulator differs, depending upon how rapidly the brake application is released by t

Page 8 - MODULATOR

5ANTILOCK EXHAUST (FIGURE 7)When wheel lock is detected, or imminent, the antilock controller simultaneously energizes both the supply and ex

Page 9

6ANTILOCK RE-APPLYIf the antilock controller senses that wheel speed has increased sufﬁ ciently to require reapplication of braking pres

Page 10

7C. Apply a soap solution around each diaphragm cover. Leakage should not exceed a 1" bubble in less than 3 seconds. If leakage exceeds the spec

Page 11

8FIGURE 8 - M-21™, M-22™ MODULATOR ANTILOCK APPLICATION HELD POSITIONBRAKE VALVESPRINGSUPPLY DIAPHRAGMFIGURE 9 - M-21™, M-22™ MODULATOR CONNECTOR VIEW

Page 12

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BENDIX SD-13-4793 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Modulateur BENDIX SD-13-4793. BENDIX SD-13-4793 User's Manual Manuel d'utilisatio

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