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Bendix

®

 AD-IS

®

 & AD-IS

®

 PuraGuard

®

 (Oil Coalescing) Air Dryer & 

Reservoir Systems

Desiccant Cartridge 

(PuraGuard

® 

oil coalescing shown)

Purge 

Reservoir

24

AUX 1

Auxiliary

Delivery 

Ports (4)

Governor

Heater 

Thermostat

Safety 

Valve

Air Dryer 

Part Number 

Stamped 

Here

Mounting 

Bolts (3)

22

SEC

 Delivery to 

Secondary 

Reservoir

21

PRI

 Delivery to 

Primary 

Reservoir

Pressure 

Protection 

Valves (4)

SD-08-2418

Mounting 

Holes (4)

1

IN 

Supply from 

Compressor

UNL

Governor

Unloader (2)

EXH

Governor

Exhaust

23

AUX 2

Auxiliary 

Delivery 

Port

Pressure 

Protection 

Valves (4

)

Purge Valve

RES

Governor

Reservoir (2)

Figure 1 - Bendix

® 

AD-IS

®

 & AD-IS

®

 PuraGuard

®

 Oil Coalescing Air Dryer & Reservoir Systems 

Desiccant

Cartridge

(standard shown)

PuraGuard Medallion 

(located on the top of the 

air dryer cartridge)

OE and Service New Bendix

®

 AD-IS

®

 purge 

valves, manufactured after December 2014, 

contain two parallel ribs on the side of the body 

as shown above. These ribs identify the purge 

valve as a genuine Bendix

®

 product.  If the OE 

or Service New air dryer or purge valve being 

serviced was manufactured after this date and 

does not contain these ribs, it is not a genuine 

Bendix product.

Summary of Contents for SD-08-2418

Page 1: ...or Exhaust 23 AUX 2 Auxiliary Delivery Port Pressure Protection Valves 4 Purge Valve RES Governor Reservoir 2 Figure 1 Bendix AD IS AD IS PuraGuard Oil Coalescing Air Dryer Reservoir Systems Desiccant...

Page 2: ...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 pres...

Page 3: ...essure 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 theAD ISair dryer res...

Page 4: ...as adsorption Dry air exits the desiccant cartridge through the center of the base assembly then flows to the delivery check valve through an orifice and into the purge reservoir The delivery check va...

Page 5: ...ck Valve open Primary Port PRI Purge Valve Open Turbo Cut Off Valve Closed Engine Turbo Unloader Port Supply Port Primary Reservoir Pressure Protection Valves Exhaust Safety Valve Purge Reservoir Drai...

Page 6: ...ve housing With the turbo cut off valve seated in the closed position air in the compressor discharge line as well as the AD IS air dryer inlet port cannot enter the air dryer By completing these acti...

Page 7: ...oo close to the air compressor For assistance contact the Bendix TechTeam at 1 800 AIR BRAKE 1 800 247 2725 option 2 or bendix com D In areas where more than a 30 degree range of temperature occurs in...

Page 8: ...cold weather operation as follows A Electric Power to the Dryer Refer to Figure 4 With the ignition or engine kill switch in the RUN position check for voltage to the heater and thermostat assembly us...

Page 9: ...vailable for the servicing of the pressure protection valves Do not attempt to adjust or service the pressure protection valves incorrect pressure protection valve settings can result in the automatic...

Page 10: ...s not build use the following procedure to remove clean and reinstall the delivery check valve DELIVERY CHECK VALVE CLEANING PROCEDURE Note This is only required if system pressure does not build afte...

Page 11: ...for corrosion and replace as necessary ASSEMBLY 1 Lubricate the smaller o ring and check valve body with a heavy duty lithium grease 2 Install this o ring on the check valve body by sliding the o ring...

Page 12: ...12 NOTES...

Page 13: ...governor cut out and allow a full minute for the normal dryer purge cycle to empty the purge reservoir Switch off the engine and apply and release the brakes so that the system pressure reaches gover...

Page 14: ...Air dryer not purging F Refer to Symptom 6 G Purge air exhaust time is insufficient due to excessive system leakage G Refer to Symptom 1 3 Safety valve on the air dryer is popping off or exhausting a...

Page 15: ...air dryer purge valve exhaust may look like whitish liquid or paste or small beads A Faulty dryer cartridge A Replace the Bendix AD IS air dryer cartridge or AD IS air dryer B Excessive dryer vibrati...

Page 16: ...007 2018 Bendix Commercial Vehicle Systems LLC a member of the Knorr Bremse Group 04 18 All Rights Reserved Log on and Learn from the Best On line training that s available when you are 24 7 365 Visit...

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