BENDIX AD-IS - Handbuch - Seite 6

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A. Electric Power to the Dryer

With the ignition or engine kill switch in the RUN

position, check for voltage to the heater and

thermostat assembly using a voltmeter or testlight.

Unplug the electrical connector at the air dryer and

reservoir system and place the test leads on each of

the connections of the female connector on the

vehicle power lead. If there is no voltage, look for a

blown fuse, broken wires, or corrosion in the vehicle

wiring harness. Check to see if a good ground path

exists.

B. Thermostat and Heater Operation

Note: These tests are not possible except in cold

weather operation.

Turn off the ignition switch and cool the thermostat and

heater assembly to below 40 degrees Fahrenheit. Using

an ohmmeter, check the resistance between the

electrical pins in the air dryer and reservoir system

connector half. The resistance should be 1.5 to 3.0

ohms for the 12 volt heater assembly and 6.0 to 9.0

ohms for the 24 volt heater assembly.

Warm the thermostat and heater assembly to

approximately 90 degrees Fahrenheit and again check

the resistance. The resistance should exceed 1000

ohms. If the resistance values obtained are within the

stated limits, the thermostat and heater assembly is

operating properly. If the resistance values obtained are

outside the stated limits, replace the heater and

thermostat assembly.

6. Pressure Protection Valves. Observe the pressure

gauges of the vehicle as system pressure builds from

zero. The primary or secondary gauge should rise until

it reaches approximately 106 p.s.i. (±6 p.s.i.), then level

off (or a momentary slight fall) as the next pressure

protection valve opens supplying its reservoir. When

that pressure gauge passes through approximately 106

p.s.i. (±6 p.s.i.) there should be an associated leveling

off (or momentary slight fall) of pressure as the third and

fourth pressure protection valves open. Then the primary

and secondary gauges should increase together until

they reach their full pressure of approximately 130 psi

(±5 psi).

If the AD-IS

air dryer and reservoir system does not

perform within the pressure ranges as described above,

recheck using gauges known to be accurate. If the

readings remain outside of the ranges outlined above,

replace the AD-IS

air dryer and reservoir system. NOTE:

There are no kits available for the servicing of the

pressure protection valves. WARNING: Do not attempt

to adjust or service the pressure protection valves -

incorrect pressure protection valve settings can

result in automatic application of the vehicle spring

brakes without prior warning in the event one of

the supply circuits experiences rapid pressure loss.

REBUILDING THE AD-IS

RESERVOIR SYSTEM

GENERAL SAFETY GUIDELINES

WARNING! PLEASE READ AND FOLLOW

THESE

INSTRUCTIONS

PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following

general precautions should be observed at all times.

1. Park the vehicle on a level surface, apply the

parking brakes, and always block the wheels.

Always wear safety glasses.

2. Stop the engine and remove 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.

AD-IS

AIR DRYER

GOVERNORS

ARE NON-

ADJUSTABLE

AND FEATURE A

BREATHER VALVE

IN THIS PORT

PRESSURE

PROTECTION

VALVE

LOCATIONS

FIGURE 5 - PRESSURE PROTECTION VALVE LOCATIONS

WARNING:

DO NOT ATTEMPT TO ADJUST OR

SERVICE THE PRESSURE PROTECTION

VALVES. INCORRECT PRESSURE

PROTECTION VALVE SETTINGS CAN

RESULT IN AUTOMATIC APPLICATION OF

VEHICLE SPRING BRAKES WITHOUT

PRIOR WARNING.

AIR DRYER AND

AVOID