BENDIX SR-5 TRAILER SPRING BRK VALVE Manuel - Page 9

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BENDIX SR-5 TRAILER SPRING BRK VALVE Manuel

DISASSEMBLY

The following procedure is for reference only. Always have

the appropriate maintenance kit on hand, and use its

instructions in lieu of those presented here. Refer to Figure

9 throughout the procedure.

1. Remove the four screws(1) that secure spring retainer(2)

to the valve body. Note that the retainer is spring-loaded.

Remove the screws while holding the retainer against

its spring load. Then slowly remove the retainer.

2. Remove spring(3) and piston assembly(4).

3. Remove piston o-ring(5). Do not remove the retaining

ring and stem from the piston. The piston is serviced as

an assembly.

4. Note and mark the position of control piston cover(7).

Then remove the four screws(6) that secure the cover

to the body.

5. Remove cover(7) and sealing ring(8), control piston(9),

and spring(10).

6. Remove o-rings(11 & 12) from piston assembly.

7. Remove reservoir fitting(13) and o-ring(14).

8. Remove spring(15) and inlet/exhaust valve(16).

9. Remove the pipe plugs that retain the three single check

valves. Two check valves are in the body, and one is in

the cover(7).

10. Remove check valve springs(17) and rubber check

valves(18).

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

ring(19) in the end of the reservoir fitting check valve

assembly. Remove spring seat(20), spring(21), and

check valve(22).

12. Remove screw(23), washer(24), and diaphragm (25)

from the exhaust port.

CLEANING AND INSPECTION

1. Inspect all parts for excessive wear or deterioration.

Inspect valve seats for nicks or burrs. Check the springs

for cracks or corrosion.

2. Inspect the bores of the valve housing for deep scuffing

or gouges.

Replace all non-metallic parts and any part not found to be

serviceable during inspection, using only genuine Bendix

replacement parts.

ASSEMBLY

Before assembling the SR-5

o-ring grooves, piston bores, and metal-to-metal moving

surfaces with Bendix silicone lubricant BW-650-M piece

number 291126.

NOTE: When using pipe thread sealant during assembly

and installation, take particular care to not allow

the sealant into the valve itself. Apply the sealant

beginning with the second thread back from the end.

1. Twist the springs(17) on each of the check valves(18).

Drop the assemblies into their respective bores in the

valve body and install the pipe plugs. Torque the plugs

to 140-170 inch pounds.

2. Place reservoir fitting(13) upright, pipe threads down.

Drop check valve(22) into place. Install check valve

spring(21), spring seat(20), and snap ring(19). Install

o-ring(14) into fitting.

3. Install inlet/exhaust valve(16) into valve body. NOTE: The

side with four protruding ears rests against the seat in

the body.

4. Place spring (15) in position on the inlet/exhaust valve.

Make sure the spring rests evenly on the four ears of

the inlet/exhaust valve and the rubber protrusion on the

valve fits into the spring's inner diameter.

5. Properly align the inlet/exhaust valve springboard in the

recess at the end of the reservoir port fitting(13). Install

the fitting into the valve body. Torque to 200-300 inch

pounds.

6. Install o-rings(11 & 12) into their respective grooves in

control piston(9).

7. Drop and position spring(10) into the valve body.

8. Make sure all parts are properly aligned, and install the

control piston(9) into the valve body.

9. Install sealing ring(8) in cover(7), and install cover onto

valve body, using the identification made in

DISASSEMBLY step 4. Torque screws(6) to 40-60 inch

pounds.

10. Install o-ring(5) in its groove in the pressure protection

piston(4). Install the piston assembly into the valve body.

11. Position the spring(3) and spring retainer(2) on top of

the pressure protection piston assembly, and secure

with the four screws(1). Torque to 20-30 inch pounds.

12. Install diaphragm(25), washer(24) and screw(23) into the

exhaust port. Torque screw to 15-25 inch pounds.

NOTE: BEFORE PLACING THE VEHICLE BACK INTO

SERVICE, PERFORM "OPERATIONAL AND

LEAKAGE TESTS," LISTED IN THIS MANUAL.

™

valve, lubricate all o-rings,