BENDIX SR-4 SPRING BRAKE CONTROL VLV Manual - Page 6

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BENDIX SR-4 SPRING BRAKE CONTROL VLV Manual

FIGURE 5 INSETS - VIEWS OF LOCATION OF THE FOUR CHECK VALVE ASSEMBLIES (4)

DISASSEMBLY TYPE 2 SR-4

(REFER TO FIG. 5)

1. Remove and save the eight cap screws holding the two

spring retainers in place. Remove the spring retainers

and remove the springs (1 & 2) taking note of the

differences and from which cavity it was removed. (One

is color coded green the other white.)

2. With a pair of pliers, grasp the raised surface of the two

piston assemblies (3) and remove them from the valve

body housing.

3. Refer to Fig. 5. With a 5/16 inch Allen Wrench, remove

the four 3/8 inch pipe plugs from the SR-4

(Three are in the main body and one is in the end cap.)

Trailers without anti-compounding feature will not have

a check valve in the end cover. Remove the four check

valve assemblies (4), one under each of the 3/8 inch

pipe plugs.

4. Note and mark the position of the end cover to the

body. Remove the four cap screws that retain the end

cover. Remove the end cover from the body. Remove

the sealing ring (5) from the end cover.

5. Remove the large piston from its bore by grasping the

web with a pair of pliers and pulling. Remove the spring

(6) from the base of the bore. Remove the o-rings (7 &

8) from the piston.

EXHAUST

END CAP

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VALVE

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valve.

6. Remove the check valve assembly from the main body

by lightly clamping the body in a vise and turning the

check valve assembly counterclockwise with a 1-1/4

inch end wrench. Remove the spring (9) and the inlet/

exhaust valve (10) from the housing. Remove the o-ring

(11) from the O.D. of the check valve assembly.

7. With a pair of I.D. snap ring pliers, remove the snap

ring in the end of the check valve assembly. Remove

the spring seat, the conical spring (12) and the check

valve (13).

8. Using a Phillips head screwdriver, remove the Phillips

head screw and the diaphragm washer from the

exhaust port of the SR-4

diaphragm (14).

CLEANING AND INSPECTION

1. Using mineral spirits or an equivalent solvent, clean

and thoroughly dry all metal parts.

2. Inspect the interior and exterior or all metal parts that

will be reused for severe corrosion, pitting or cracks.

Superﬁ cial corrosion and/or pitting on the exterior

portion of the valve is acceptable.

3. Inspect the bores of the valve housing for deep scufﬁ ng

or gouges.

BODY

EXHAUST

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valve body. Remove the

END CAP