BENDIX R-12DC Service Data - Seite 7

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CLEANING AND INSPECTION

1. Wash all metal parts in mineral spirits and dry them

thoroughly.

(Note: When servicing the Bendix

springs and all rubber parts should be replaced.)

2. Inspect all metal parts for deterioration and wear, as

evidenced by scratches, scoring and corrosion.

3. Inspect the exhaust valve seat on the relay piston for

nicks and scratches which could cause excessive

leakage.

4. Inspect the inlet valve seat in the body for scratches

and nicks, which could cause excessive leakage.

5. Inspect the check valve seat in the R-12DC valve cover

and make sure all internal air passages in this area are

open and clean and free of nicks and scratches.

6. Replace all parts not considered serviceable during

these inspections and all springs and rubber parts. Use

only genuine Bendix replacement parts, available from

any authorized Bendix parts outlet.

ASSEMBLY

Note: All torque specified in this manual are assembly

torque and can be expected to fall off slightly after

assembly. Do not re-torque after initial assembly torque

fall. For assembly, hand wrenches are recommended.

Prior to assembly, lubricate all o-rings, o-ring bores and

any sliding surface with a silicone lubricant equivalent to

Dow Corning

#10.

Wash all remaining parts in mineral spirits and dry thoroughly.

Using the lubricant provided in this kit, lightly lubricate all

o-rings, o-ring grooves, body bores and sliding surfaces.

1. Install o-rings (14 & 15) in the exhaust cover assembly

(16).

2. Install o-ring (8) on piston (9).

3. Install sealing ring (7) on cover (1).

4. Install retainer (12) on the inlet/exhaust valve (11) and

insert both in the body (10).

5. Install spring (13) in the body (10).

6. Install exhaust cover assembly (16) in the body (10).

Depress and hold the exhaust cover assembly in the

body.

7. Install retaining ring (17) in the body (10). Make certain

the retaining ring is completely seated in the groove in

the body.

8. Install piston (9) in the body (10).

9. Install o-ring (5) on double-check cover (6), install spring

(2), guide (3) and double-check diaphragm (4) in cover

(1). Install cover (1) and torque torx head screws to

80–100 in-lbs.

R-12DC

valve, all

10. Referring to the marks made during disassembly, install

cover (1).

11. Install the mounting bracket (not shown) on the cover

(1).

12. Install the four cap screws in the cover (1) and torque

to 80–100 in-lbs.

13. Test the valve as outlined in the Operational and

Leakage Test section before returning the valve to

service.

INSTALLATION

1. Clean the air lines.

2. Inspect all lines and/or hoses for damage and replace

as necessary.

3. Install the valve and tighten the mounting bolts.

4. Connect the air lines to the valve (plug any unused

ports).

5. Test the valve as outlined in Operational and Leakage

Tests.

OPERATIONAL AND LEAKAGE TEST

1. Chock the wheels, fully charge the air brake system

and adjust the brakes.

2. Make several brake applications and check for prompt

application and release at each wheel.

3. Check for inlet valve and o-ring leakage. Make this

check with the service brakes released. Coat the

exhaust port and the area around the retaining ring

with a soap solution; leakage of a one inch bubble in

three seconds is permitted.

4. Check for exhaust valve leakage. Make this check with

the service brakes fully applied. Coat the outside of

the valve where the cover joins the body to check for

seal ring leakage; no leakage is permitted.

If the valves do not function as described above, or if

leakage is excessive, it is recommended that the valves

be replaced with new or remanufactured units or repaired

with genuine Bendix parts, available at any authorized

Bendix parts outlet.