BENDIX AR-2 ANTILOCK RELAY VALVE Manual - Page 10

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DISASSEMBLY

GENERAL

The following disassembly and assembly procedure is

presented for reference purposes only and presupposes

that the appropriate maintenance kit is on hand at the time

of disassembly. The instructions provided with the

maintenance kit should always be used in lieu of those

presented here. Refer to figure 10 throughout the disassembly

and assembly procedure. CAUTION: The AR-2

be lightly clamped in a bench vise during disassembly,

however, over clamping will cause damage to the valve and

result in leakage and/or malfunction. If a vise is to be used,

position the valve so that the jaws bear on the supply ports

on opposing sides of the valve's body.

1. Remove all air fittings and plugs from the AR-2

2. Mark the relationship of the antilock electronic controller

(2) and valve cover (4) to the body (9). Note the position

of the mounting bracket (6) and mark the relationship of

the bracket to the valve body (9), cover (4), and antilock

controller (2). Remove and retain the four cap screws

and lock washers (1) that secure the controller to the

cover (4), then carefully remove the electronic controller

without damaging its gasket (3).

3. While holding the exhaust cover (11), remove the retaining

ring (10) that secures it to the body (9).

4. Remove the exhaust cover (11) along with both o-rings

(12 & 13).

5. Remove the valve spring (14), valve retainer (15), and

the valve assembly (16) from the body (9).

6. Remove and retain the two cap screws and lock washers

(5) that secure the bracket (6) to the cover (4). Remove

and retain the two bolts with lock washers (7), and nuts

(8) that secure the cover (4) and mounting bracket to

the valve body (9). Then remove the remaining two cap

screws (7) that secure the cover (4) to the body (9).

7. Separate the cover (4) and mounting bracket (6) from

the body (9), then remove the large and small sealing

rings (19 & 40).

8. Remove and retain the relay piston (17) and relay piston

spring (if present) from the body (9). NOTE: The relay

piston spring is not used in all AR-2

9. Remove the o-ring (18) from the relay piston (17).

10. Remove the retaining ring (20) from the cover (4), then

remove the exhaust piston (21).

11. Remove the exhaust piston o-ring (22).

12. Remove the service piston (23) from the cover (4).

13. Remove the spring (24) and spring cage (25) from the

cover (4).

14. Remove the blend back piston (26) from the valve cover

(4), then remove both o-rings (27 & 28).

15. Remove the proportioning piston (30) from the valve cover

16. While holding the inlet valve seat (34) in place, remove

17. Remove the inlet valve seat (34), the inlet valve (33),

18. Remove the exhaust diaphragm screw (37), washer (38)

™

valve may

CLEANING & INSPECTION

1. Using mineral spirits or an equivalent solvent, clean and

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

™

valve.

3. Inspect the bores of both the body (9) and cover (4) for

4. Make certain all air channels and exhaust passages in

5. Inspect the pipe threads in the body (9). Make certain

6. Wash all non-metallic components in a soap and water

7. If the valve was equipped with a relay piston spring,

8. Inspect all air line fittings for corrosion and replace as

ASSEMBLY

1. Prior to assembly, lubricate all o-rings, seals, and pistons,

™

valves.

2. Install the o-ring (35) on the inlet valve seat (34).

3. Insert the inlet and exhaust valve spring (32), LARGE

4. Install the inlet and exhaust valve (33) inside the inlet

(4), then remove both o-rings (29 & 31).

the retaining ring (36) from the proportioning piston (30).

and the valve spring (32) from the proportioning piston

(30), then remove the o-ring (35) from the valve seat (34).

and exhaust diaphragm (39) from the cover (4).

thoroughly dry all metal parts.

will be reused for severe corrosion, pitting and cracks.

Superficial corrosion and/or pitting on the exterior

portion of the body (9) and cover (4) is acceptable.

Replace the entire valve if the interior of the body or

cover exhibit signs of corrosion or pitting.

deep scuffing or gouges. Replace the entire valve if

either are found.

the valve cover (4) are clear and free of obstruction.

they are clean and free of thread sealant.

solution making certain to rinse and dry thoroughly.

Inspect each non-metallic component for cracks, wear

or distortion. Replace the entire valve if these conditions

are found.

inspect it for signs of corrosion, pitting and cracks.

Replace as necessary.

necessary. Make certain to remove all old thread sealant

before reuse.

as well as body and cover bores, using the lubricant

provided with the Bendix maintenance kit.

END FIRST, into the proportioning piston (30).

valve seat (34) making certain that the four tabs are

within the bore of the seat.