BENDIX SD-13-4958 Uživatelský manuál stáhnout pdf

Supply Port

(Casting has

“1, SUP”)

Exhaust Port

(Body has

“3, EXH”)

Supply

Port

(Casting has

“1, SUP”)

Exhaust Port

(Body has “3, EXH”)

Electrical

Connector

Mounting Holes

(.33" Diameter

Through Body)

Alternate Push-to-

Connect Version,

Showing Optional

Packard Connector

Electrical

Connector

Delivery Port

(Casting has

“2, DEL”)

Bendix

M-40HF

™

Modulator

Bendix

M-40QR

™

Modulator

SD-13-4958

DESCRIPTION

The Bendix

M-40QR

™

(quick release) and M-40HF

™

(high

ow) pressure modulator valves (PMVs) are high-capacity,

on/off air valves that incorporate a pair of electrical

solenoids for control. See Figure 1. The solenoids provide

the electro-pneumatic interface between the vehicle’s

electronic control system and the air brake system. For

example, the PMV is used to control the braking function

of service actuators during antilock activity.

The modulator consists of a die cast metal and plastic body

that houses one normally-open solenoid, one normally-

closed solenoid, and an inlet and exhaust diaphragm

valve. A three-pin weather-resistant electrical connector

is an integral part of the modulator solenoid assembly

and delivers the vehicle controller’s commands to the

modulator. Two mounting holes are provided for frame or

crossmember mounting of the valve.

The Bendix M-40QR modulator is the direct replacement

for the Bendix M-32QR modulator (See Figure 2). The

Bendix M-40QR modulator has a bias valve to provide an

internal quick-release function.

Bendix

M-40QR

™

and M-40HF

™

Pressure Modulator Valves

FIGURE 1 - M-40QR

™

AND M-40HF

™

PRESSURE MODULATOR VALVES

The supply, delivery and exhaust ports on the Bendix M-40

modulators have embossed identication codes.

Port ID

Air Hose

Connection

Function

1, SUP Supply

Air enters from a valve (typically

foot, relay or quick release).

2, DEL Delivery

Air is delivered to the service

actuators.

3, EXH Exhaust Air is vented to the atmosphere.

FIGURE 3 - PORT DESIGNATION AND FUNCTION

APPLICATIONS

Bendix M-40 modulators may be used for various purposes

on a vehicle including ABS and stability interventions. In

applications using these PMVs, an external quick release

valve may also be required, depending on the system

design. Where the modulator is used for individual wheel

control applications, it is typically the last control valve

through which air passes on its way to the service brake

actuator. See Figure 4 for a typical system schematic.

Previous Model

M-32

™

Modulators

Bendix M-32QR

™

(left) and M-32

™

(right) Modulators

FIGURE 2 - M-32

™

MODULATORS

1 2 3 4 5 6 7 8

Shrnutí obsahu

Strany 1 - Pressure Modulator Valves

1Supply Port(Casting has“1, SUP”)Exhaust Port(Body has“3, EXH”)Supply Port(Casting has “1, SUP”)Exhaust Port(Body has “3, EXH”)Electrical Connector Mo

Strany 2 - GENERAL SAFETY GUIDELINES

2GENERAL SAFETY GUIDELINESWARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONSTO AVOID PERSONAL INJURY OR DEATH:When working on or around a vehicle, the

Strany 3

3PRESSURE MODULATOR VALVE (PMV) AND TRACTION CONTROL VALVE (TCV) CHUFF TESTA wiring harness connects the vehicle modulators to the controller. The AB

Strany 4 - OPERATION

4ANTILOCK OPERATIONGENERALSee Figure 6. The rst four rows of this table show normal vehicle braking where the PMV does not intervene. In th

Strany 5 - PREVENTIVE MAINTENANCE

5ANTILOCK APPLY MODEIf a service brake application is made and the antilock system detects an impending wheel lockup, the antilock controller will mak

Strany 6 - ELECTRICAL TESTS

6LEAKAGE TEST1. Park the vehicle on a level surface and block or chock the wheels. Release the parking brakes and build the air system to full pressu

Strany 7 - MODULATOR REMOVAL

7FIGURE 9 - BENDIX® M-40QR™ AND M-40HF™ MODULATORS DIN SYMBOLMODULATOR REMOVAL1. Locate the modulator that will be replaced and clean the exterior.2.

Strany 8 - GLOSSARY