BENDIX E-12 Manuel - Page 7

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DISASSEMBLY

The following disassembly and assembly procedure is pre-

sented for reference purposes and presupposes that a major

rebuild of the brake valve is being undertaken. Several re-

placement parts and maintenance kits are available which

do not require full disassembly. The instructions provided

with these parts and kits should be followed in lieu of the

instructions presented here.

Caution: The brake valve may be lightly clamped in a

bench vise during disassembly, however, over clamping

will result in 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 delivery and supply ports on

opposing sides of the valve's upper body.

1. Remove all air line fittings and plugs.

2. Mark the relationship of the upper and lower body (a

scribed line can be used) then remove the four cap

screws (16) that secure the lower body to the upper

body. Separate the two body halves and remove and

discard the o-ring (17).

3. Pull the secondary piston (18) out of the upper body and

remove and discard the o-rings (19 & 20) from it.

4. Remove and discard the special beveled retaining ring

(10) from the lower body while manually holding and

compressing the valve seat (11) in place.

5. Slowly release the valve seat (11), allowing it to rise out

of the body. Remove the valve seat (11) then remove and

discard the o-ring (12).

6. Remove and discard the valve assembly (13) along with

its o-ring (15) from the lower body. Remove the valve

assembly return spring (14).

7. Carefully remove and discard the exhaust diaphragm

retainer (24) and exhaust diaphragm (25) from the lower

body.

Note: Some E-12

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& E-15

exhaust ports in lieu items 24 & 25.

8. Using finger force, push the piston (2) into the body until

the piston retaining ring (1) is fully visible. Remove the

piston retaining ring (1), taking care not to damage the

piston bore in the body.

9. Gently tap the body on a soft surface to remove the

piston (2). Remove and discard the o-rings (3 & 5) and

both wear rings (4) from the piston (2).

10. Place the piston on a flat surface and using finger force,

depress and hold the spring retainer (7), then remove

and discard the retaining ring (6) from the piston (2).

11. Gently release the spring retainer (7), allowing it to rise

out of the piston. Remove the spring retainer (7) and

graduating spring (8) from the piston (2).

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brake valves have threaded

12. Remove and discard the rubber spring (9) from the

interior of the piston (2).

Note: The rubber spring (9) is installed in the E-12

brake valve only.

13. Remove and discard the special beveled retaining ring

(10) from the piston (2) while manually holding and

compressing the valve seat (11) in place.

14. Slowly release the valve seat (11), allowing it to rise out

of the piston (2). Remove the valve seat (11), then

remove and discard the o-ring (12).

15. Remove and discard the valve assembly (13) along with

its o-ring (15) from the piston (2). Remove the valve

assembly return spring (14).

CLEANING & INSPECTION

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

thoroughly dry all metal parts.

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

will be reused for severe corrosion, pitting and cracks.

Superficial corrosion and or pitting on the exterior por-

tion of the upper and lower body halves is acceptable.

3. Inspect the bores of both body halves for deep scuffing

or gouges.

4. If the primary piston (2) is to be reused make certain

that vents "A & B" are open and free of obstructions.

5. Make certain vent "C" is open in the upper body of the

valve.

6. Inspect the pipe threads in both body halves. Make

certain they are clean and free of thread sealant.

7. Inspect the treadle or pedal assembly and mounting plate

which attaches to the basic valve. Make certain that

the treadle or pedal roller turns freely and is lightly

lubricated.

Note: Some treadle/pedal assemblies, not furnished by

Bendix, do not employ a roller in which case make cer-

tain the mechanism in use moves across the plunger

smoothly without binding or sticking. Inspect the plunger

for excessive scuffing and wear. Check the plunger bore

in the mounting plate for excessive wear as exhibited by

"egg shaping." Inspect the mounting plate for severe

corrosion paying particular attention to the area around

the pedal or treadle fulcrum pin bores.

8. When applicable (in use), check the rubber boot installed

between the plunger and mounting plate for deteriora-

tion or cracking. Replace if necessary.

9. Inspect all air line fittings and plugs for corrosion. Clean

all old thread sealant from the pipe threads.

Any valve or treadle assembly component exhibiting a con-

dition described in inspection steps 1 to 9 should be discarded

and replaced before proceeding.

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