MCi Crusader II 1989 Maintenance Manual page 495

Date
1-1-89
Page ___
1s_-_2s _ _ _
MC-9 MAINTENANCE MANUAL
located above the compressor pulley. This
will
loosen the
belts enough to facilitate removal.
6. Remove the four nuts that mount the compressor to
the mounting bracket and remove the compressorfrom the
coach.
CAUTION: The compressor weighs ap-
proximately 145 lbs. (65 kg). Exercise
extreme caution during removal proce-
dure. Use adequate sling and hoist.
REPLACEMENT AND INSTALLATION
Replacement compressors are normally furnished with-
out suction and discharge service valves. The service
valves are normally retained on the unit to isolate the refrig-
erant lines during compressor replacement. Blankoff pads
are usually ;nstalled on the service valve flanges. These
pads must l;e removed prior to installing the compressor. If
the faulty compressor is to be returned for overhaul or
repair, in .tall the pads on the compressor for sealing pur-
poses d1 ring shipment. -
CAUTION: Do not backseat (open) suc•
lion and discharge service valves until
the compressor has been leak tested
and evacuated.
1. Install compressor in coach; reverse removal proce-
jure. above.
2. Install new locknuts on compressor mounting bolts
and new gaskets on suction and discharge service valves.
3. Check oil level in oil level sight glass. Oil level should
be between bottom 1/s and ½of sight glass. If necessary, add
or remove oil.
4. Leak test, evacuate, and dehydrate the compressor.
5. Fully backseat suction and discharge service valves.
6. Operate the compressor and check for leaks and non-
condensibles in the refrigerant system.
7. Check refrigerant level.
8. Recheck compressor oil level.
9. Check operation of capacity control unloa~~rs.
DISASSEMBLY
Prior to disassembly of the compressor, oil must first be
drained from the crankcase. Refer to figure 16-25.
1. Remove the oil fill plug to vent the crankcase. Loosen
the drain plug in the bottom plate and allow the oil to drain
completely.
2. If dismantled parts are to be left overnight or longer,
dip them in clean compressor oil and wrap them in oil
soaked rags to prevent rusting.
NOTE: If a faulty part In the compressor Is
to be replaced,
It
may be necessary to
remove other parts fl,st. Therefore, the
disassembly instructions that follow are
arranged In the order for complete dlsas•
sembly.
WARNING: Do not unscrew capscrews all
the way before breaking seal. Entrapped
pressure could result In Injury.
3. Loosen cylinder head capscrews. If the head is stuck,
tap it lightly with a wooden or lead mallet to free it.
4. Remove cylinder head. Be careful not to drop the head
or damage the gasket sealing surface (figure 16-26).
Figure
16-26:
Removing Cylinder Head
5. Remove cylinder head capscrews and gasket from the
head.
6. Remove the discharge valve capscrews, lock washers,
stops, and valves (figure 16-27).
CYIJND£R H£AO
GASl<ET
DISCHARGE
VALVE STOP
Figure 16-27: Discharge Valve Assembly
7. Free the valve plates from the cylinder deck by using
the discharge valve capscrews, without washers, as jack-
screws through the outermost tapped holes in the valve