4-24. CAB HEATER ASSEMBLY (cont)
CLEANING, INSPECTION, AND REPAIR
Drycleaning solvent P-D-680 is toxic and
flammable. Wear protective goggles and gloves
and use only in a well-ventilated area. Avoid
contact with skin, eyes, and clothes and don't
breathe vapors. Do not use near open flame or
excessive heat. The flash point is 100 - 138°F
(38 - 59°C). If you become dizzy, get fresh air
and medical aid immediately. If contact with
eyes is made, wash your eyes and get medical aid
Clean parts (except motor) in drycleaning solvent.
Compressed air used for cleaning purposes will
not exceed 30 psi (207 kPa). Do not direct
compressed air against skin. Use goggles or
full face shield.
Clean motor by blowing off dust and dirt with compressed air. If necessary to remove oil or grease, use a
cloth dampened with drycleaning solvent.
Inspect parts for cracks, breaks, and damage.
Inspect heater core for bent fins, loose tubes, leaks, and damage.
Inspect motor for damage. Check brushes for serviceability.
Repair consists of replacement of damaged parts.
Position switch (48) in heater frame and install two lockwashers (47) and screws (46). Install knob (45) on
switch and install screw (44). Connect wires to switch and remove tags.
Position resistor (43) in heater frame and install two screws (42), flat washers (41), lockwashers (40), and
nuts (39). Connect wires (38) to resistor and remove tags.
Place fan guard (34) on radiator core (35) and install four screws (36) and lockwashers (37). Position fan
guard and radiator core in heater frame and install four clips (33), screws (30), lockwashers (31), and flat