WD Catalog 2018

4-5

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CAUTION

Heavy duty vehicles are subject to severe extended

use and much more vibration and road shock than

passenger cars. For this reason secure compressor

mounting, accurate pulley alignment and proper belt

tension are very important. The compressor mount-

ing bracket is adjustable to allow for proper belt ten-

sion.

Pulley alignment and belt tension are critical for efficient compressor operation

and good belt life. To tension the V-belt properly, the compressor or it’s mount-

ing bracket must be adjustable and securely bolted in position when attached

to the engine.

The proper type and amount of lubrication is critical to achieving good

compressor life.

The five types of compressors you are likely to encounter in your work are:

Two-Cylinder Compressor

Four-Cylinder Compressor

Five-Cylinder Compressor

Six-Cylinder Compressor

Wankel Compressor

Each is identified in the photos in Figure 4-4. They are different in design and

construction, but all do the same job.

Compressors

CCI OR TECUMSEH TWO-

CYLINDER

SANDEN FIVE-CYLINDER

HARRISON (GM) FOUR

CYLINDER RADIAL

ZEXEL

HARRISON (GM) SIX-

CYLINDER AXIAL

HARRISON (GM) SIX-

CYLINDER DA-6 (METRIC)

WANKEL RADIAL

Figure 4-4

The compressor designs

shown here all function to

move refrigerant and refrig-

eration oil around inside an

AC system. The two, four,

five, several six cylinder,

and the Wankel compres-

sors are illustrated.