BENDIX DV-2 Dati di servizio - Pagina 2

Sfoglia online o scarica il pdf Dati di servizio per Unità di controllo BENDIX DV-2. BENDIX DV-2 4. Automatic reservoir drain valve

Stampa la pagina

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

DRM

dryer reservoir module, or a Bendix

™

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

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.

AD-IS

air dryer system, a Bendix

AD-9si

brand replacement parts,

NOTE: If a vehicle equipped with a Bendix

automatic drain valve(s) is operated in subfreezing

temperatures, it is recommended that a heated reservoir

drain valve be installed.

OPERATION

Referring to Figure 2, with no air pressure in the system,

the inlet and exhaust valves are closed. Upon charging

the system, a slight pressure opens the inlet valve (see

Figure 3) which permits air and contaminants to collect in

the sump. The inlet valve remains open when pressure is

ascending in the system until maximum (governor cut‑out)

pressure is reached. The spring action of the valve guide in

the sump cavity closes the inlet valve. The inlet valve and

the exhaust valve are now closed (as shown in Figure 4).

When reservoir pressure drops slightly (approximately 2

psi), air pressure in the sump cavity opens the exhaust

valve (see Figure 5) and allows moisture and contaminants

to be ejected from the sump cavity until pressure in the

sump cavity drops sufficiently to close the exhaust valve.

The length of time the exhaust valve remains open and the

amount of moisture and contaminants ejected depends

upon the sump pressure and the reservoir pressure drop

air

that occurs each time air is used from the system.

Manual draining can be accomplished as follows:

•

Using a tool, move the wire in the exhaust port upward,

holding it in until draining is completed.

•

The thermostat on the heated model DV‑2 automatic

drain valve will activate the heating element when the

valve body reaches a temperature of approximately

45°F and will deactivate the heating element when the

valve body is warmed to approximately 85°F.

PREVENTIVE MAINTENANCE

Important: Review the Bendix Warranty Policy before

performing any intrusive maintenance procedures. A

warranty may be voided if intrusive maintenance is

performed during the warranty period.

No two vehicles operate under identical conditions, as

a result, maintenance intervals may vary. Experience is

a valuable guide in determining the best maintenance

interval for air brake system components. At a minimum,

the automatic reservoir drain valve should be inspected

every 6 months or 1500 operating hours, whichever comes

first, for proper operation. Should the automatic reservoir

drain valve not meet the elements of the operational tests

noted in this document, further investigation and service

of the valve may be required.

DV‑2

™