BENDIX SD-08-2418 Manuel - Page 3

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1. Troubleshooting Chart

DESCRIPTION

The function of both the Bendix

Air Dryer) air dryer & reservoir system, and the Bendix

AD-IS

PuraGuard

oil coalescing air dryer & reservoir

system, is to collect and remove air system contaminants

in solid, liquid, and aerosol form before they enter the brake

system. As a module, they provide heavy vehicles with an

integrated vehicle air dryer, purge reservoir, governor, and

a number of the charging valve components in a complete

assembly. These components have been designed as an

integrated air supply system.

Both air dryer & reservoir systems provide clean, dry air

to the components of the brake system – which increases

the life of the system and reduces maintenance costs.

The need for daily manual draining of the reservoirs is

eliminated.

The Bendix AD-IS PuraGuard oil coalescing air dryer has

an identical appearance to the standard Bendix AD-IS air

dryer with one exception – it contains a coalescing media at

the inlet of the desiccant bed and an identifying medallion

on the top (See Figure 1). The coalescing media provides

a higher level of oil removal over the standard AD-IS air

dryer. The AD-IS PuraGuard oil coalescing air dryer has

all of the same functions as the standard AD-IS air dryer

and is used in applications where lower oil concentration

levels are required.

IMPORTANT

When servicing, note that standard AD-IS air dryers or

air dryer cartridges may be serviced with PuraGuard oil

coalescing air dryers or cartridges, however, PuraGuard oil

coalescing air dryers or cartridges must only be serviced

with like replacements.

Note: Unless otherwise stated in this manual, AD-IS air

dryer & reservoir systems refers to both the standard and

the PuraGuard oil coalescing air dryer & reservoir systems.

The function of the pressure protection valves is to protect

each reservoir from a pressure loss in the other reservoir or

a pressure loss in an air accessory. Each of the pressure

protection valves in the AD-IS air dryer & reservoir systems

may have different pressure settings. These are factory set

and must not be changed or adjusted.

The air dryer & reservoir system consists of a spin on

desiccant cartridge secured to a base assembly. The

base assembly contains a delivery check valve assembly,

safety valve, heater and thermostat assembly, pressure

protection valves, threaded air connections, and the purge

valve assembly.

AD-IS

(Integrated Solution

Air Connection

Port ID

Inlet Port (air in)

Delivery Port Out (to Primary

PRI

Reservoir)

Delivery Port Out (to Secondary

SEC

Reservoir)

Auxiliary Delivery Port (air out)

AUX 1

Auxiliary Delivery Port (air out)

AUX 2

Unloader Control Air

UNL

(Bendix

Common Reservoir Pressure

RES

(D-2A Governor)

EXH

Governor Exhaust

Table 1 – Port Designations

The removable purge valve assembly incorporates the

purge valve mechanism and a turbocharger cut-off feature

that is designed to prevent loss of engine turbo boost

pressure during the purge cycle of the Bendix AD-IS air

dryer & reservoir system. For ease of maintenance, all

replaceable assemblies can be serviced without removal

of the air dryer & reservoir system from its mounting on

the vehicle. Refer to the Preventive Maintenance section.

BENDIX AD-IS AIR DRYER & RESERVOIR

SYSTEM OPERATION: GENERAL

(Refer to Figure 2.)

The Bendix AD-IS air dryer & reservoir systems are

designed to receive compressed air from the vehicle air

compressor, clean and dry the air, deliver air to the vehicle's

primary reservoir, secondary reservoir and accessories,

and control the compressor/dryer charge cycle.

The AD-IS air dryer & reservoir system alternates between

two modes, or cycles, during operation: the Charge Cycle

and the Purge Cycle. What follows describes these cycles

of operation.

Function/

Connection

D-2A

Governor)

™

Qty.