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a. Remove brush covers.
b. With fingers or suitable hook, lift the brush
spring end up so the brush may slide up and
out of the holder. Loosen the brush screw to
remove the brush shunt terminal. Remove
brush.
c. To replace, lift brush spring and place brush in
holder. Position spring end on top of the brush.
d. Connect the brush shunt terminal to its proper
crossover with the brush screw loosely.
e. Assure positioning of brush to permit the brush
shunt to travel freely in the holder slot as the
brush wears. If it hangs up, commutator
damage and motor failure will result.
f.
Tighten the brush screw.
4.17 REPLACING THE RETURN AIR FILTERS
The return air filters are located in front of the
evaporator coil. Access to the filters is through the
return air opening inside the bus.
The filters should be checked periodically
depending
on
operating
cleanliness. A dirty air filter will restrict the air flow
over the evaporator coil. This could cause
insufficient cooling or heat and possible frost build
up on the coil.
Remove filters as follows:
a. Remove the return air grille.
b. Loosen the filter retaining clips.
c. Pull the first filter forward and out through the
return air opening.
d. Slide the second filter past the holding channel
to the center position and remove.
e. Repeat the above step with the third filter.
f.
Reverse the procedure for installing the new
filters.
4.18 COMPRESSOR
4.18.1 Replacing the Compressor
a. Removing
1. If compressor is inoperative and refrigerant
pressure still exists, frontseat the suction and
discharge service valves to isolate most of the
refrigerant in the system from the compressor.
T-288
2. Slowly release compressor pressure to a
3. Remove the suction and discharge service
4. Loosen the compressor to allow removal of all
5. Disconnect the wire connections to the
6. Attach sling or other device to compressor to
7. Remove the clutch from the compressor.
conditions
for
12
11
4-12
NOTE
If the compressor runs, pump down the
compressor by frontseating the suction
service valve until the pressure drops to 1
psig, then stop the unit.
recovery system.
valves and disconnect the high and low
pressure switches (HPS and LPS).
belts from the compressor.
unloader.
remove.
The
approximately 146 lbs.
NOTE
If the compressor is to be returned to the
factory, drain oil from defective compressor
before shipping.
1
2
3
4
10
1. Discharge Service
Port
2. Discharge Service
Valve
3. Unloader Coil
4. Discharge Snubber
Assembly
5. High Pressure
Switch
compressor
weighs
5
6
7
8
9
6. Suction Service
Valve
7. Suction Service Port
8. Clutch Assembly
9. Oil Fill Plug
10. Oil Level Sight Glass
11. Oil Drain Plug
12. Oil Pressure Tap
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