BENDIX E-6 Manual - Halaman 4

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SERVICE CHECKS

OPERATING CHECK

Check the delivery pressure of both primary and secondary

circuits using accurate test gauges. Depress the treadle to

several positions between the fully released and fully

applied positions, and check the delivered pressure on the

test gauges to see that it varies equally and proportionately

with the movement of the brake pedal.

After a full application is released, the reading on the test

gauges should fall off to zero promptly. It should be noted

that the primary circuit delivery pressure will be about 2 PSI

greater than the secondary circuit delivery pressure with

both supply reservoirs at the same pressure. This is normal

for this valve.

Important: A change in vehicle braking characteristics or a

low pressure warning may indicate a malfunction in one or

the other brake circuit, and although the vehicle air brake

system may continue to function, the vehicle should not be

operated until the necessary repairs have been made and

both braking circuits, including the pneumatic and mechani-

cal devices, are operating normally. Always check the vehicle

brake system for proper operation after performing brake

work and before returning the vehicle to service.

LEAKAGE CHECK

1. Make and hold a high pressure (80 psi) application.

2. Coat the exhaust port and body of the brake valve with a

soap solution.

3. Leakage permitted is a 1" bubble in 3 seconds. If the

brake valve does not function as described above or leak-

age is excessive, it is recommended that it be replaced

with a new or remanufactured unit, or repaired with genu-

ine Bendix parts available at authorized Bendix parts

outlets.

REMOVAL

1. Check the vehicle wheels or park the vehicle by

mechanical means. Drain all air system reservoirs.

2. Identify and disconnect all supply and delivery lines at

the brake valve.

3. Remove the brake valve and treadle assembly from the

vehicle by removing the three cap screws on the outer

bolt circle of the mounting plate. The basic brake valve

alone can be removed by removing the three cap screws

on the inner bolt circle.

DISASSEMBLY

(Figures 3 and 4)

1. If the entire brake valve and treadle assembly was re-

moved from the vehicle, remove the three cap screws

securing the treadle assembly to the basic brake valve.

2. Remove the screw (9) securing the exhaust diaphragm

(10) and washer (11) to the exhaust cover (12).

3. Remove the four screws that secure the exhaust cover

(12) to the lower body.

4. Remove the Secondary inlet and exhaust valve assem-

bly (13) from the lower body.

5. Remove the four hex head cap screws securing the lower

body to the upper body and separate the body halves.

6. Remove the rubber seal ring (14) from the lower body.

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E-6

VALVE ONLY (Figure 3):

7. While applying thumb pressure to the primary piston, lift

out and up on the three lock tabs of the primary piston

retainer (15).

E-10

™

VALVE ONLY (Figure 4):

8. A.

While depressing spring seat (7), remove retaining

ring (8).

Remove spring seat and coil spring (5).

9. Using a 3/8" wrench, hold the lock nut (16) on the

threaded end of the stem (17) in the primary piston (2).

Insert a screwdriver in the exhaust passage through the

center of the valve and engage the slotted head of the

stem.

10. Remove lock nut (16), spring seat (18), stem spring (19),

primary piston (2), and primary piston return spring (6).

Remove o-ring (34).

11. Remove adapter (1). Remove o-ring (4) from adapter.

Caution: Before proceeding with the disassembly, refer

to Figure 4 and note that the lock nut and stem are used

to contain the primary piston return spring, stem spring

and the relay piston spring. The combined force of these

springs is approximately 50 pounds and care must be

taken when removing the lock nut as the spring forces

will be released. It is recommended that the primary

piston and relay piston be manually or mechanically

contained while the nut and stem are being removed.

™

E-6

VALVE ONLY:

12. Using a screwdriver to restrain the stem, as in step nine,

remove the lock nut (16), spring seat (18) and stem

spring (19).

13. Remove the relay piston (20), relay piston spring (21),

primary piston and primary piston return spring (23) from

the upper body. Use care so as not to nick seats.

™

Note: Certain E-6

valves do not have a relay piston spring

(21). If none is found, none should be replaced.

14. On valves manufactured after October 7,1976, a small

washer (24) will be found in the cavity in the lower side

of the primary piston (22).

15. Disassemble the primary piston by rotating the spring

seat nut (25) counterclockwise. Separate the spring seat