Removing; Disassembly - BENDIX D-2 GOVERNOR Manual

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.
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