BENDIX BW2159 User Manual download pdf

SD-03-832

Bendix

E-10PR

™

Retarder Control Brake Valve

DESCRIPTION

Refer to Figures 3 and 4 for item numbers referenced in

parenthesis.

The Bendix

E-10PR

™

retarder control brake valve is used

with retarder systems installed on automatic transmissions.

Automatic transmission retarders are used to retard forward

motion of the vehicle above 5 mph. Retarders are most

popular in the transit (buses/coaches) industry and are used

to extend the life of brake system components.

The retarder system is actuated early in the brake

application, before air pressure is delivered.

Retarders can be installed either internally or externally on

the automatic transmission and are generally electrically

activated by devices such as the E-10PR

™

valve. Most

retarders redirect the flow of hydraulic fluid through the torque

converter while others use a small internal brake in the output

section of the transmission.

The E-10PR

™

valve is capable of controlling up to a three-

stage retarder (different levels of retardation) through the

sequencing of its three electrical switches. The sequencing

of these switches is important to the proper operation of the

retarder.

E-10PR

™

retarder control brake valve is a floor mounted,

treadle operated type brake valve with two separate supply

and delivery circuits for service (primary and secondary)

braking, which provides the driver with a graduated control

for applying and releasing the vehicle brakes.

The E-10PR

™

valve uses a metal coil spring (6) housed in an

upper body assembly. The use of a metal coil spring (and

the upper body assembly) provides greater treadle travel

and, therefore, provides the driver with a less sensitive "feel"

when making a brake application. The E-10PR

™

retarder

control brake valve is generally used on buses, where smooth

brake applications contribute to passenger comfort.

The circuits in the E-10PR

™

retarder control brake valves

are identified as follows: The No. 1 or primary circuit is that

portion of the valve between the spring seat which contacts

the plunger and the relay piston; the No. 2 or secondary

circuit is that portion between the relay piston and the

exhaust cavity.

The primary circuit of the valve is similar in operation to a

standard single circuit air brake valve and under normal

operating conditions the secondary circuit is similar in

operation to a relay valve.

Both primary and secondary circuits of the brake valve use

a common exhaust protected by an exhaust diaphragm.

OPERATION - Refer to Figure 2

APPLYING: NORMAL OPERATION - NO. 1 OR

PRIMARY CIRCUIT PORTION

When the brake treadle is depressed, the plunger exerts

force on the spring seat (5), graduating spring (12), and

primary piston (11). The primary piston, which contains the

exhaust valve seat, closes the primary exhaust valve. As

the exhaust valve closes, the primary inlet valve is moved off

its seat allowing primary air to flow out the No. 1 or primary

delivery port.

FIGURE 1 - E-10PR

™

RETARDER CONTROL BRAKE

VALVE

MOUNTING

PLATE

TREADLE

SUPPLY

4 PORTS

DELIVERY

4 PORTS

AUXILIARY

EXHAUST

RETARDER

CONTROL

SECTION

ELECTRICAL

CONNECTOR

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - Retarder Control Brake Valve

1®SD-03-832Bendix® E-10PR™ Retarder Control Brake ValveDESCRIPTIONRefer to Figures 3 and 4 for item numbers referenced inparenthesis.The Bendix® E-10P

Page 2

2FIGURE 2 - TYPICAL PIPING SCHEMATICTP-5™ TRACTORPROTECTION VALVEMV-3™MANIFOLDVALVEBRAKECHAMBERSLACKADJUSTERCOMPRESSORSUPPLYRESERVOIR(WET TANK)#1 SERV

Page 3

3on the secondary side of the relay piston (24) closelyapproaches the air pressure on the primary side of the relaypiston.When the brake treadle is fu

Page 4 - SERVICE CHECKS

4SERVICE CHECKSOPERATING CHECKCheck the delivery pressure of both primary and secondarycircuits using accurate test gauges. Depress the treadle toseve

Page 5

5FIGURE 4 - E-10PR™ RETARDER CONTROL BRAKE VALVE - EXPLODED VIEW123456789101112131415161718192021222324252627282930

Page 6 - ASSEMBLY

611. A small washer (26) will be found in the cavity of thelower side of the primary piston (11).12. Remove the large and small o-rings (23 & 25)

Page 7 - VALVE INSTALLATION

7VALVE INSTALLATION1. Install the assembled brake valve on the vehicle.2. Reconnect all air lines to the valve using the identificationmade during

Page 8 - PERSONAL INJURY OR DEATH: