BENDIX SD-01-3131 Manuale Utente

This Bendix

®

 720cc twin cylinder compressor is a “discharge 

line unloader” DLU-style compressor.  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.  With a DLU-style compressor, 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 air dryer (see Figure 6).

The function of the air compressor is to provide and 

maintain air, under pressure, to operate devices in air brake 

systems. The Bendix

 

720cc compressor is a twin cylinder 

reciprocating compressor with a rated displacement of 31.6 

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 cast 

iron valve plate assembly. It uses two sealing gaskets. 

The cylinder head contains air and water ports. A cooling 

plate is located between the cylinder head and valve plate 

assemblies and assists in cooling.

The valve plate assembly consists of brazed cast iron 

plates which have valve openings and passages for air and 

engine coolant to flow into, and out of, the cylinder head and 

crankcase water jacket. The compressor discharge valves 

®

MAXXFORCE

®

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

Bendix Part Number             A

Customer Part Number                    B

Compressor Serial Number      C

B

Safety 

Valve

Cooling 

Plate

Cylinder 

Head

Valve Plate 

Assembly

Locating

Pins

Crankcase

Mounting 

Face

Rear 

Flange

Right Side 

View