BENDIX E-8P Manuale - Pagina 4

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Every 3 months, 25,000 miles, or 900 operating

hours:

Clean any accumulated dirt, gravel, or foreign material

away from the heel of the treadle, plunger boot, and mount-

ing plate.

Lubricate the treadle roller, roller pin, and hinge pin, with

Barium grease per BW-204-M (Bendix part 246671).

Check the rubber plunger boot for cracks, holes, or dete-

rioration and replace if necessary. Also, check mounting

plate and treadle for integrity.

Apply a thin layer of Barium grease, per BW-204-M (Bendix

part 246671), between plunger and mounting plate – do

not over oil!

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

mechanical 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

leakage is excessive, it is recommended that it be

replaced with a new or remanufactured unit, or repaired

with genuine Bendix parts available at authorized

Bendix parts outlets.

Refer to ﬁ gures 4, 5 and 6 for item numbers referenced

in parenthesis.

REMOVAL

1. Chock the vehicle wheels or park the vehicle by

mechanical means. (Block and hold vehicle by means

other than air brakes.) 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 4, 5 and 6)

1. If the entire brake valve and treadle assembly was

removed 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

assembly (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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7. For E-8P

valve only: While applying thumb pressure

to the primary piston (22), lift out and up on the three

lock tabs of the primary piston retainer (15).

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8. For E-10P

valve only: While depressing spring seat

(7), remove retaining ring (8). Remove spring seat (7)

and coil spring (5).

Caution: Before proceeding with the disassembly, refer

to Figures 3 and 4 and note that the lock nut (16) and

stem (17) are used to contain the primary piston return

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spring (for E-8P

valve: 23, for E-10P

spring (19), and the relay piston spring (21). The com-

bined 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.

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

threaded end of the stem (17). Insert a screwdriver to

restrain the stem, remove the lock nut (16), spring seat,

(18) and stem spring (19).

10. For E-10P

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valve only: Remove adapter (1) and o-ring

(4). Remove the primary piston (2) from adapter (1) and

o-ring (34) from the primary piston (2).

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valve: 6), stem