BENDIX D-2 GOVERNOR Manual - Page 3

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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.

3. 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.

4. 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 an AD-IS

air dryer system or a dryer reservoir module, be

sure to drain the purge reservoir.

5. Following

the

recommended procedures, deactivate the electrical

system in a manner that safely removes all

electrical power from the vehicle.

6. Never exceed manufacturer's recommended

pressures.

7. Never connect or disconnect a hose or line

containing pressure; it may whip. Never remove a

component or plug unless you are certain all

system pressure has been depleted.

8. Use only genuine Bendix

components and kits. Replacement hardware,

tubing, hose, fittings, etc. must be of equivalent

size, type and strength as original equipment and

be designed specifically for such applications and

systems.

9. Components with stripped threads or damaged

parts should be replaced rather than repaired. Do

not attempt repairs requiring machining or welding

unless specifically stated and approved by the

vehicle and component manufacturer.

10. Prior to returning the vehicle to service, make

certain all components and systems are restored

to their proper operating condition.

REMOVING AND INSTALLING

REMOVING

1. Block and hold vehicle by means other than air brakes.

2. Drain air brake system.

3. If the governor is compressor-mounted type, disconnect

reservoir air line. If the governor is remote-mounted,

disconnect both the unloader and reservoir air lines.

4. Remove governor mounting bolts, then governor.

Caution: Prior to disassembly, it is required to have the

proper maintenance kit available to replace parts to be

discarded during disassembly.

vehicle

manufacturer's

replacement parts,

DISASSEMBLY

1. Clean the governor exterior of dirt and grease.

2. If the governor cover is marked nonadjustable and the

adjusting screw has been sheared off, this is a

nonserviceable governor and must be replaced with a

new or remanufactured unit.

3. If the governor has a blue nonmetallic cover, (refer to

Figure 2) hold governor with one hand, with the other

hand grip cover from the top and pull up with thumb until

cover disengages from the governor body. If top cover on

governor is made of rubber or clear nonmetallic material

unscrew cover until it releases from the adjusting screw

(4) of governor. Remove o-ring (20, Figure 2) if present.

Note: O-ring (20) is used on Hi-Temp and waterproof

™

governors only.

4. With a pair of retaining ring pliers, remove the spring

assembly retaining ring (1) and save.

5. Pull the adjusting screw (4) and spring assembly out of

the governor body (2).

Note: Disassembly of the spring assembly normally is

not required. (Reuse and do not wash the assembly

because lubrication may be removed.) If Disassembly

of the spring assembly is necessary, the following in-

structions apply; otherwise, proceed to Step 6.

Remove the lock nut (3), then the hex-shaped upper

spring seat (16) from the adjusting screw (4). Remove

the pressure setting spring (17), lower spring seat (19),

spring guide (18) and the other lower spring seat (19)

from the adjusting screw (4).

6. Gently tap the open end of the valve body on a flat sur-

face to remove the exhaust stem (5), the exhaust stem

spring (6), and piston assembly (11). Items 5 and 11

may be made of metal or nonmetallic material.

7. Remove and discard the two o-rings (8) on the piston

O.D. and with a hooked wire remove and discard the

o-ring (12) from the piston l.D. On nonmetallic piston,

washer (13) and retaining ring (14) may be removed to

facilitate removal of o-ring (12).

8. If piston assembly is nonmetallic (Figure 3), use a small

screwdriver and carefully insert blade of screwdriver be-

tween two of the ears of the retainer ring in the bottom of

the piston (11) and pry retainer ring (15) out of the piston

and discard. Remove inlet/exhaust valve spring (9) and

the inlet/exhaust valve (10) and discard. If piston as-

sembly is metallic, disengage inlet/exhaust valve spring

(9) from recess in bottom of piston (11), remove inlet/

exhaust valve spring (9), and the inlet exhaust valve (10)

and discard.

9. Remove and discard filters (7) from unloader and

reservoir ports in governor body.