BENDIX R-8R ELAY VALVE Manuale utente

Figure 1 – Bendix®R-8™Relay Valve Maintenance Kit Contents

BENDIX®R-8™RELAY VALVE MAINTENANCE KIT

Valve

Cover

Valve Body

Piston Return

Spring

Piston

Cap Nut

10-24

Screw Exhaust

Cover

Exhaust Cover

Assembly

Screw Washer

Kit Contents

Item No. Description Qty.

1 O-Ring (.987" I.D.) 1

2 O-Ring (3.725" I.D.) 1

3 O-Ring (1.424" I.D.) 1

4Inlet-Exhaust Valve Assy. 1

5 Sealing Ring (4.125" I.D.) 1

6 Exhaust Diaphragm 1

7 Diaphragm 1

8 Tube of Lubricant 1

Bendix®R-8™Relay Valve

GENERAL SAFETY GUIDELINES

WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS

TO AVOID PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following guidelines should be observed AT ALL TIMES:

▲Park the vehicle on a level surface, apply the

parking brakes and always block the wheels.

Always wear personal protection equipment.

▲Stop the engine and remove the ignition key

when working under or around the vehicle.

When working in the engine compartment,

the engine should be shut off and the ignition

key should be removed. Where circumstances

require that the engine be in operation, EXTREME

CAUTION should be used to prevent personal

injury resulting from contact with moving,

rotating, leaking, heated or electrically-charged

components.

▲Do not attempt to install, remove, disassemble

or assemble a component until you have read,

and thoroughly understand, the recommended

procedures. Use only the proper tools and

observe all precautions pertaining to use of those

tools.

▲If the work is being performed on the vehicle’s

air brake system, or any auxiliary pressurized air

systems, make certain to drain the air pressure

from all reservoirs before beginning ANY work

on the vehicle. If the vehicle is equipped with a

Bendix®AD-IS®air dryer system, a Bendix®DRM™

dryer reservoir module, or a Bendix® AD-9si®air

dryer, be sure to drain the purge reservoir.

▲Following the vehicle manufacturer’s

recommended procedures, deactivate the

electrical system in a manner that safely removes

all electrical power from the vehicle.

▲Never exceed manufacturer’s recommended

pressures.

▲Never connect or disconnect a hose or line

containing pressure; it may whip and/or cause

hazardous airborne dust and dirt particles. Wear

eye protection. Slowly open connections with

care, and verify that no pressure is present. Never

remove a component or plug unless you are

certain all system pressure has been depleted.

▲Use only genuine Bendix®brand replacement

parts, components and kits. Replacement

hardware, tubing, hose, ﬁ ttings, wiring, etc. must

be of equivalent size, type and strength as original

equipment and be designed speciﬁ cally for such

applications and systems.

▲Components with stripped threads or damaged

parts should be replaced rather than repaired.

Do not attempt repairs requiring machining or

welding unless speciﬁ cally stated and approved

by the vehicle and component manufacturer.

▲Prior to returning the vehicle to service, make

certain all components and systems are restored

to their proper operating condition.

▲For vehicles with Automatic Traction Control

(ATC), the ATC function must be disabled (ATC

indicator lamp should be ON) prior to performing

any vehicle maintenance where one or more

wheels on a drive axle are lifted off the ground

and moving.

▲The power MUST be temporarily disconnected

from the radar sensor whenever any tests USING

A DYNAMOMETER are conducted on a vehicle

equipped with a Bendix® Wingman®system.

▲You should consult the vehicle manufacturer's operating and service manuals, and any related literature,

in conjunction with the Guidelines above.

REMOVAL

1. Block or hold the vehicle by means other than the air

brakes.

2. Drain all air brake system reservoirs.

3. Identify, mark, and disconnect all air lines from the R-8™

relay valve.

4. Remove the R-8 valve from its mount on the vehicle.

DISASSEMBLY OF VALVE

1. Note and mark position of the valve cover to the body.

2. Remove the four 5/16" - 18 hex screws and separate

the cover from the body. Some valves have a piston

return spring; if so, remove.

3. Remove the sealing ring (5) from the body.

4. Remove the piston, cap nut, and diaphragm (7) from

the cover.

5. Remove the o-ring (1) from the cap nut and the o-ring (2)

from the piston.

6. Remove the four 10-24 screws which secure the

exhaust cover to the body.

7. Remove the screw, washer, and diaphragm (6) from

the exhaust cover.

8. Remove the complete inlet and exhaust valve assembly (4)

from the valve body.

ASSEMBLY

Prior to assembly of new parts in the valve, clean all parts

in a cleaning solvent equivalent to mineral spirits making

sure all surfaces, bores, and passages are clean and dry.

Grease all o-rings, bores, pistons and internal parts with

the lubricant (8) supplied in the kit.

1. Install the o-ring (3) on the inlet and exhaust valve

assembly (4).

2. Install the diaphragm (6) and diaphragm washer and

secure with a screw. Torque screw to 15-25 in-lbs.

3. Install the inlet and exhaust valve assembly (4) in the

valve body. Position exhaust cover assembly so that

all holes are properly aligned and secure with four

10-24 screws. Torque screws to 20-30 in-lbs.

4. Install the sealing ring (5) in the valve body.

5. Install the piston return spring if the valve requires a

spring. (See "Disassembly", Step 2.)

6. Install the o-ring (2) on the piston and then install the

piston and o-ring in the cover.

7. Install the o-ring (1) on the cap nut.

8. Install the diaphragm (7) in the cover and install the

cap nut. Make certain the diaphragm is free to move

and is not pinched by the cap nut. Torque cap nut to

180-400 in-lbs.

9. If valve is so equipped, install the exhaust cover and

secure it with a 10-24 screw. Torque screw to 15-24

in-lbs.

10. Install the cover assembly on the valve body as marked

and secure with four 5/16" hex head screws. Torque

to 120-150 in-lbs.

INSTALLATION

1. Mount the Bendix®R-8™valve on the vehicle.

2. Connect the air lines to the R-8 valve using the

identification made during Step 3 of "Removal"

instructions.

3. Perform "Operating and Leakage Checks" before

placing the vehicle in service.

OPERATING AND LEAKAGE TEST

1. Block the wheels and fully charge the air system. Adjust

the brakes.

2. Apply and release the parking brakes several times

and check for prompt response of the brakes at all

appropriate wheels.

3. With the park control valve in the "brakes applied"

position, coat the exhaust port with a soap solution to

check for inlet valve and o-ring leakage; a 1" bubble in

5 seconds is permissible.

4. Place the park control valve in the "brakes released"

position and again check at the exhaust port for

leakage of the exhaust valve; a 1" bubble in 3 seconds

is permissible. Apply a soap solution around the valve

where the cover joins the body to check for seal ring

leakage; no leakage permitted.

5. With the park control still in the "brakes released"

position, apply a soap solution to the quick release

exhaust port to check the diaphragm exhaust seat; a

1" bubble in 3 seconds is permitted.

Note: If the anti-compound feature is in use, the line

attached to the R-8 quick release valve exhaust must

be disconnected to perform this test.

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