TM 5-4520-241-14
Table 5-1. Direct Support and General Support Troubleshooting - Continued
MALFUNCTION
TESTING OR INSPECTION
CORRECTIVE ACTION
1 - Continued
reassembling in the reverse order of disassembly.
Step 6.
Check thermal cutout. Remove and disassemble motor as described in step 5. Check continuity
through thermal cutout (25). The internal switch must be closed at room temperature.
If the thermal cutout is open, cut the wires at the connectors (27). Cut off Ty-rap (24) securing
thermal cutout (25) to the motor field, and discard. Install a new thermal cutout and secure with a
new Ty-rap. Connect cutout to motor field with connectors, and crimp connectors to retain.
Continue testing per step 7 before reassembling in the reverse order of disassembly.
Step 7.
Check motor brushes. Remove screws (28) and clamps (29). Inspect brushes (31) for excessive
wear, cracks, and other damage.
Replace defective brushes. Secure new brushes with clamps (29) and screws (28). Be sure to
install ground strap (30) under screw (28) as shown in figure 5-2. Reassemble the motor in
reverse of disassembly. Note relationship of parts in figure 5-2. Retain housing (19) by staking to
motor (32) with prick punch. Seal notches in motor housing with General Electric RTV-102, or
equivalent, and seal the housing-to-motor joint with tape.
2.
HEATER IGNITES, BUT VENTILATING MOTOR FAILS TO RUN.
Step 1.
Check motor. Disconnect power plug and open access doors. Remove louvered panel adjacent to
ventilating motor. Disconnect white motor lead at electrical connector. Disconnect orange lead at
terminal strip. Apply 120 VAC to white and orange motor leads.
5-6
