BENDIX E-2-E-3 BRAKE VALVES Manual - Halaman 2

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When applications in the above average pressure range are

made, the valve reaches a balanced position as the air

pressure beneath the piston equals the effort exerted by the

driver's foot on the pedal or treadle. When the piston is

pressed down all the way, the inlet valve remains open and

reservoir pressure is delivered to the actuators.

Releasing

When the treadle or pedal application is released, mechanical

force is removed from the top of the piston, air pressure

beneath the piston lifts the piston; (the inlet valve is closed)

the exhaust in the valve is open and the air beneath the

piston and in the delivery lines is exhausted through the

exhaust port.

PREVENTIVE MAINTENANCE

Important: Review the warranty policy before performing

any intrusive maintenance procedures. An extended warranty

may be voided if intrusive maintenance is performed during

this period.

Because no two vehicles operate under identical conditions,

maintenance and maintenance intervals will vary. Experience

is a valuable guide in determining the best maintenance

interval for any one particular operation.

Visually check for physical damage to the brake valve such

as broken air lines and broken or missing parts.

Every 3 Months, 25,000 Miles or 900 Operating Hours

Lubricate all mechanical actuation (pedal) parts with light

(10W) oil. Apply 2 to 4 drops of oil between the plunger and

mounting plate. DO NOT OVER OIL!!!

Lever/linkage operated valves should be adjusted so that

the roller just contacts plunger. Check for integrity of mounting

plate and treadle and/or pedal.

SERVICE TESTS

Operating Test (IMPORTANT!!! Tests should be

conducted with an accurate test gauge.)

Install gauge in a delivery port or line; depress the treadle or

pedal to several positions between fully released and fully

applied positions, checking the delivery pressure on the

gauge to see that it varies proportionately with the movement

of the treadle or pedal. In the fully applied position, the

reading on the gauge should be approximately that of full

reservoir pressure. Upon release of the application, the

reading of the test gauge should fall to zero psi immediately.

Leakage Test

With 100 psi supply pressure and valve in released position,

coat exhaust port with soapsuds arid check for leakage.

NO leakage permitted.

Fully apply valve and hold application. Coat exhaust port

with soapsuds. NO leakage permitted. Coat area around

top of valve with soapsuds. NO leakage permitted.

If the valve does not function as described 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 our distributors.

REMOVING AND INSTALLING

Removing

Block and hold vehicle by means other than air brakes.

Drain air brake system.

*If only the insert is to be removed, remove retaining ring,

and pull insert out.

If entire valve is to be removed, disconnect air lines from

valve.

Remove mounting bolts and remove valve.

Installing

Clean air lines connecting to valve.

Install valve and tighten mounting bolts.

Connect air lines to valve (plug any unused ports).

Test valve as outlined under "Service Tests."

NOTE: When installing a new or rebuilt insert, precheck

movement of the inlet and exhaust valve in the

exhaust seat by depressing the insert. Precaution

should be taken to prevent damage to the inlet and

exhaust valve and the exhaust check valve grommet,

when installing the insert in the valve. After placing

the insert in the valve body, depress the exhaust

check valve seat and install the retaining ring. Make

sure the retaining ring snaps into the body groove.

DISASSEMBLY

NOTE: Disassembly and assembly instructions are keyed

to Fig. 1 sectional view.

1. Remove treadle or lever assembly, boot and plunger.

2. Depress piston assembly and remove retainer (4).

3. Remove piston assembly (7) and piston return spring (2)

from body.

4. Remove o-ring (3) from piston (7).

5. Remove cap screw (6), washer (8), spring seat (9),

and rubber spring (10) from piston assembly (7).

6. Remove retaining ring (1) and inlet/exhaust insert

assembly (11) from body.