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1

GENERAL

For genuine Bendix remanufactured compressors 

not

 

equipped with a drive gear, it is necessary to remove the 

existing gear from the old compressor and reinstall it on the 

new remanufactured compressor. 

NOTE: 

It may be necessary to remove the fittings from the 

cylinder head prior to removing the gear to prevent damage.

 

IMPORTANT

The Bendix remanufactured compressor is equipped with 

a new safety valve. Do not reuse the old safety valve.

KIT COMPONENTS

•  Genuine Bendix remanufactured BA-921 Compressor 

(including safety valve)

GEAR REPLACEMENT PROCEDURE

1.  After removing the old compressor from the engine, 

place the compressor with drive gear facing upward so 

it can be removed safely. 

NOTE:

 It may be helpful to 

secure the compressor and gear so that the gear does 

not rotate and the lock nut can be removed more easily. 

See Figure 1.

Figure 1 – Remove the Bendix

®

 BA-921

®

 Compressor 

Bendix

®

 BA-921

®

 Compressor Gear Replacement for Detroit

®

 Diesel Corporation (DDC) 

Engines DD13

®

 and DD15

®

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, a Bendix

® 

AD-9si

®

, AD-HF

®

or AD-HFi

 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.

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