TM 5-4520-241-14
Table 5-1. Direct Support and General Support Troubleshooting - Continued
MALFUNCTION
TESTING OR INSPECTION
CORRECTIVE ACTION
3 - Continued
Install four insulators with the smaller hole into the heat exchanger, then install the two insulators
with the larger hole. See figure 5-5. Reinstall burner head and carburetor.
Figure 5-5. Heat exchanger insulator installation.
Step 2.
Check combustion motor assembly. Disconnect power plug, open the access doors, and remove
the louvered panels. Disconnect combustion motor leads at the terminal strip. Remove screw and
lock washers through support tube securing top of motor to heater case. Remove nuts and
washers securing base of motor to heater case. Disconnect air duct from motor housing, and pull
out motor assembly. Remove screws and lock washers securing top motor housing assembly to
bottom motor housing assembly, and separate housings. Remove screws, lock washers, and
ground strap, and separate motor housing from motor. Inspect combustion motor for defective
armature bearings, or loose fans.
If motor bearings are defective, or fans are loose, correct as follows:
5-11