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MAINTENANCE
Crusader
MC-8
[,.c,~1~6_-~29 _ _
DAIE_Se_pt_em_be_r,_1_97_5_] ·
MANUAL
Note: It is very important when reassembling fan
wheels to motor shaft that fan-blades are curved op-
posite rotation of motor shaft. Example: If motor
shaft turns clockwise, the fan blades will be curved in
a counter-clockwise direction.
DO NOT INST ALL fan wheels with blades curved
in same direction as rotation of motor shaft. This will
make the condenser motor become overloaded and
could burn out if limit of circuit breaker is not reached.
The curved fan blades are retained to the floating
hub by a lock ring which allows blades to float in
correct alignment for balance. Periodically clean the
fan blades and hub free of dirt to prevent seizure.
Care should be taken to prevent bending or distorting
outer retaining rings.
REMOVAL
I.
Remove the L.H. front baggage compartment
panel.
2.
Disconnect wiring attached to motor.
3.
Remove motor bracket from condenser floor and
motor. Condenser motor and fan wheels may
then be removed from
the condenser com-
partment through the baggage compartment.
Care must be taken that condenser compartment
seals are in good condition. Air circulation in coach
will be impaired if leaks occur and air is drawn from
baggage compartment.
MAINTENANCE
Turn main battery disconnect switch to "off'
position before doing any work on the electrical com-
ponents.
BRUSH ADJUSTMENT
Condenser motor speed and load is controlled by
adjusting the brush retaining ring on the motor. Ad-
justment procedure is:
I) Connect an ampere meter in series with the
motor.
2) Operate engine at fast idle. Check the ampere
draw.
It should register between 50 and 60 amps. at 27-
1
/2 volts. If not. adjust brush retaining ring to obtain
the required specification. Brushes should not be
allowed to wear below 3/4" in length.
EVAPORATOR
The evaporator is located in the central air cir-
culating chamber behind the heater core (when
viewing from front baggage compartment.)
The heater core and fan assembly can be checked
by opening the center door in the front baggage com-
partment.
The evaporator can be checked and cleaned by
Figure
16-43:
Evaporator Core, Evaporator
Fan & Motor
removing the access panel at the rear of the con-
denser compartment on the rear bulkhead.
To remove the evaporator, it is necessary to
remove the fans and ducts. the heater core and then
the evaporator and frame as one assembly.
Periodic cleaning is required to ensure full ef-
ficiency and the evaporator should be cleaned with a
cleansing agent not harmful to aluminum or copper.
EVAPORATOR FAN
&
MOTOR
Fans are conventional Sirocco type wheels moury-
ted driven by a
1-1
/2 H.P. 24-Volt motor. The motor
is two-speed type operating at low speed on heating
cycle and high speed on air conditioning.
Keep the evaporator compartment seals in good
condition otherwise air circulation in the coach will
be impaired.
I) Motor speed is controlled by adjusting brush
retaining ring on motor. Connect an ammeter 1n
series with motor lead.
2) Operate engine at fast idle. Current draw at
IL)\\
speed should be JO to 34 amps. at 27 I 2 \ults. With
"AC"
switch on and e\aporator motor operating at
high speed. current draw should be 38 to 42 amps.
at 27 I 2 volts.
Brushes should not be allowed to wear below J/4
of an inch in length.
CAUTION -
Ammeter should be connected so
evaporator access door can be closed during tests.
The motor should be checked periodically (every
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