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1

®

SD-01-503

DESCRIPTION

The D-2

 governor, operating in conjunction with the unloading

mechanism, automatically controls the air pressure in the
air brake or air supply system between a maximum (cut-
out) pressure and a minimum (cut-in) pressure. The
compressor runs continually while the engine runs, but the
actual compression of air is controlled by the governor
actuating the compressor unloading mechanism which stops
or starts the compression of air when the maximum or
minimum reservoir pressures are reached.

D-2

 governors are provided with mounting holes which allow

direct mounting to the compressor or remote mounting.

Porting consists of three reservoir ports (1/8 inch P.T.),
three unloader ports (1/8 inch P.T.) and one exhaust port
(1/8 inch P.T.).

Bendix

®

 D-2

 Governor

EXHAUST

PORT

RESERVOIR

PORTS (3)

14

RETAINING

RING

11

PISTON

4

ADJUSTING

SCREW

2

BODY

6

EXHAUST

STEM

FIGURE 1 - D-2

 GOVERNOR

5

15

11

5

11

20

O-RING

CLEAR/BLACK

NONMETALLIC

WITH O-RING

BLACK

RUBBER

BLUE

NONMETALLIC

FIGURE 2 - TYPES OF COVERS

FIGURE 3 - TYPES OF PISTONS

16

UPPER SPRING

SEAT

1

RETAINING

RING

15

RETAINING

RING

10

INLET/

EXHAUST

VALVE

12

O-RING

13

WASHER

MOUNTING

HOLES

(2)

15

RETAINING

RING

7

FILTERS

9

INLET/EXHAUST

VALVE SPRING

5

EXHAUST

STEM

8

O-RING

12 O-RING

8 O-RING

19 LOWER

SPRING SEAT

19 LOWER

SPRING SEAT

10

INLET/EXHAUST

VALVE

11

PISTON

18

SPRING GUIDE

17

PRESSURE SETTING

SPRING

3

LOCKNUT

UNLOADER

PORTS (3)

COVER

9

INLET/EXHAUST

COVER VALVE

SPRING

NONMETALLIC

METALLIC

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