Bendix-commercial-vehicle-systems ATR-3 ANTILOCK TRAC RELAY VLV User Manual download pdf

FIGURE 1 - BENDIX

ATR-6

™

(AND ATR-3

™

) ANTILOCK TRACTION RELAY VALVES

DESCRIPTION

This Service Data sheet covers the operation, and

replacement procedures, for both the Bendix

ATR-6

™

and

the previous ATR-3

™

Antilock Traction Relay valves. These

valves are specialized air brake valves developed for use

on Bendix antilock/traction-equipped vehicles.

This document will refer to the ATR-6

™

Antilock Traction

Relay valve throughout since the ATR-3

™

version operates

in an almost identical way. See Figure 1 for external

differences.

The ATR-6

™

Antilock Traction Relay valve is a service

relay valve ﬁ tted with a modiﬁ ed cover containing a Control

Solenoid. It contains both air and electric components to

provide the service braking and traction control (differential

braking) as well as ESP

advanced stability system ABS

functions.

Typically the ATR-6

™

valve replaces a standard relay valve

used to control the rear axle service brakes, though it may

be used for both front and rear axles on some advanced

ABS vehicle applications. In normal operation, it performs

the standard relay function and like the standard relay valve

it replaces, the ATR-6

™

valve is normally mounted near the

service brakes it serves.

When the ABS Controller operates the ATR-6

™

valve, for

example during an antilock traction event, the Control

Solenoid is energized and permits delivery air to be

supplied to the Antilock Modulator Valves and used as

required by the Controller - see Operation below for a full

explanation.

For ease of servicing, the inlet/exhaust valve can be

replaced without the need to remove the entire valve.

All air connections on the ATR-6

™

valve are identiﬁ ed as

shown below.

Bendix

ATR-6

™

Antilock Traction Relay Valve

AIR CONNECTION EMBOSSED IDENT.

Supply (to reservoir) . . . . . . . . . . . . . . . . .SUP (1)

Delivery (to brake chamber) . . . . . . . . . . DEL (2)

Control (to brake valve rear delivery) . . CON (4)

The ATR-6

™

valve is part of the R-12

™

family of relay valves.

The internal components of the relay portion of all of these

valves are interchangeable with the R-12

™

valve and the

same basic components are used to service all of them.

The ATR-6

™

valve is available with various crack pressures

(the control pressure required to initiate air delivery to the

brakes) to accommodate speciﬁ c vehicle applications;

however the standard is 4 psi (see Figure 7 on Page 5).

SD-13-4861

Bendix

ATR-6

™

and ATR-3

™

Antilock Traction Relay Valves

Bendix

ATR-6

™

Antilock

Traction Relay Valves

Bendix

ATR-3

™

Antilock

Traction Relay Valves

CONTROL

PORT

DELIVERY PORTS (6)

2 PIN

SOLENOID

CONNECTOR

SUPPLY

PORT

COVER

CONTROL

SOLENOID

ESP

is a registered trademark of Daimler and is used by BCVS under license.

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - and ATR-3

FIGURE 1 - BENDIX® ATR-6™ (AND ATR-3™) ANTILOCK TRACTION RELAY VALVESDESCRIPTIONThis Service Data sheet covers the operation, and replacement procedur

Page 2 - BRAKE APPLICATION

2OPERATIONGENERALSee Figure 2. The ATR-6™ Antilock Traction Relay valve is a service relay valve ﬁ tted with a modiﬁ ed cover containing a Control So

Page 3 - TRACTION CONTROL

3FIGURE 4 - BRAKE APPLICATION HOLDINGThe pressure under the piston equals the pressure above. The piston lifts slightly - the exhaust remains closed

Page 4 - INJURY OR DEATH:

4For a full description of antilock operation refer to the appropriate Service Data Sheet covering the Electronic Controller used on the vehicle. (No

Page 5 - MEASURED

5O-RING IDENTIFICATIONKey I.D. O.D. W2 3.487 3.6930.1033 3.234 3.5129 1.424 1.63010 0.862 1.06814 0.255 0.435 0.066Key No. Description1 . . . .

Page 6 - INSTALLATION

6valve insert can be removed by removing the snap ring, exhaust cover assembly and then inlet/exhaust valve. Caution: Drain all reservoirs before atte

Page 7 - LEAKAGE TESTS

75. Test valve as outlined in Operational and Leakage Tests.OPERATIONAL AND LEAKAGE TESTS1. Chock the wheels, fully charge air brake system and adju

Page 8

Bendix-commercial-vehicle-systems ATR-3 ANTILOCK TRAC RELAY VLV User Manual

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Bendix-commercial-vehicle-systems ATR-3 ANTILOCK TRAC RELAY VLV User Manual

Browse online or download User Manual for Equipment Bendix-commercial-vehicle-systems ATR-3 ANTILOCK TRAC RELAY VLV. Bendix Commercial Vehicle Systems ATR-3 ANTILOCK TRAC RELAY VLV User Manual

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