TM 5-4520-241-14
Table 5-1. Direct Support and General Support Troubleshooting - Continued
MALFUNCTION
TESTING OR INSPECTION
CORRECTIVE ACTION
3 - Continued
There is normally sufficient slack in wires (5 and 6, fig. 5-6) to permit disassembly, but the wires
may be unsoldered from suppression capacitors (3) if necessary.
Remove screws (10) and clamps (11), and remove brush assemblies (12).
Remove screws (13) and ground strap (14), and pull off frame cap (15) and loading spring (16).
Rotate armature (19) to determine condition of ball bearings (21), and to check that fan
assemblies (24 and 27) are tight on armature shaft.
If bearings or armature must be replaced, remove nut (17) and washer (18) from lower end of
armature shaft, and pull out armature and bearings. Remove bearings with a puller and press on
new bearings. Reassemble in the reverse order of removal, guiding threaded end of armature
shaft through assembled housings and fan assemblies (22 through 28).
If fan assemblies are loose, grasp armature and tighten nut (17). If fan assemblies are defective,
remove tape that seals upper and lower chambers to housing frame assembly (22). Pry off lower
chamber (28). Remove nut (17) and washer (18), and pull off fan assembly (27). Pry off upper
chamber (26), and remove spacer spool (25) and fan assembly (24). Reassemble in the reverse
order of disassembly.
5-12
