BENDIX SD-01-3121 Manual Do Utilizador

The function of the air compressor is to provide and 
maintain air under pressure to operate devices in air brake 
systems.  The Bendix

®

 360cc compressor is a single-

cylinder compressor with a rated displacement of 15.8 cubic 
feet per minute at 1250 RPM.  The compressor consists 
of an integral water-cooled cylinder head assembly and 
water-cooled crankcase.

The cylinder head assembly is made up of an aluminum 
cylinder head, an aluminum cooling plate, and a steel valve 
plate assembly with two sealing gaskets.  The cylinder head 
contains air and water ports.  The cooling plate, situated 
between the head and valve plate, assists in cooling the 
head assembly.  The valve plate assembly, consisting of 
brazed steel plates, has separate valve openings and 
passages to allow air and coolant to fl ow in and out of the 
compressor.  See Figure 1 for an external view, and Figure 
3 for an exploded view.

The compressor is equipped with a safety valve in the 
cylinder head safety valve port, directly connected to the 
discharge port.  The safety valve protects the compressor 
head in the event of excessively high discharge line 
pressure, for example, in the event of blockage downstream 
of the compressor.  Excessive air pressure causes the 
safety valve to unseat, releases air pressure and gives an 
audible alert to the operator.

The compressor is cooled by air fl ow, as well as by engine 
coolant.  The  engine coolant fi rst enters the crankcase 
water jacket to cool the cylinder bore, then passes through 
passages in the valve plate assembly, cooling plate, and 
cylinder head and then out of a port at the top of the 
compressor, back to the engine.

A nameplate is attached to a fl at cast face on the side of 
the crankcase.  It is stamped with information identifying 
the compressor designation, customer piece number, 
compressor assembly part number and serial number.  
See Figure 2.

This Bendix

®

 360cc compressor is a “discharge line 

unloader” (DLU)-style compressor, meaning that the 
compressor pumps continuously, unlike some compressor 
designs which use an "unloader" mechanism in the 
compressor head to switch from a pumping mode to a 
non-pumping mode.  Instead, the control of air delivery to 
the vehicle’s air system is managed by using a separate 
discharge line unloader valve mounted in parallel with a 
turbo cut-off style of air dryer (see Figure 6).

MAXXFORCE

™

 is a trademark of International Engine Intellectual Property Company, LLC.

Safety 

Valve

Cooling 

Plate

Valve Plate 

Assembly

Cylinder 

Head

Crankcase

Coolant 

Enters Here

Locating

Pins

Coolant Exits at 

Top of Head

(See Figure 7)

Bendix Part Number  .  .  .  .  .  .  A
Customer Piece Number .  .  .  .  B
Compressor Serial Number   .  .  C

A

B

C

A

B

C