TM 9-1829A, April 1944
73/100
2021-07-07
While holding governor mechanism against upper ball race (to prevent tiny bearing balls from falling out),
unscrew upper ball race (fig. 109). Then lift out governor mechanism and 18 bearing balls (9 at each end of
governor shaft).
Figure 109: Unscrewing upper ball race
e.
Remove drive gear and shaft:
Loosen lock nut and set screw and pull out drive gear and shaft assembly (J,
fig. 105).
39. Cleaning, inspection, and repair of parts
a.
General cleaning:
Thoroughly clean all metal parts with brush (T-170755) and a dry-cleaning solvent. Make
sure to remove every trace of grease, dirt, and lint so that any defects will be easily found. Carefully dry parts
with compressed air.
Caution: Handle pointer mechanism very carefully to prevent injury. to precision parts.
b.
Face dial and maximum hand assembly:
Move maximum hand clockwise away from pointer stop pin.
Ratchet spring (fig. 107) should make barely audible sound when this is done and should hold maximum
hand in position until manually released, allowing coil spring to return maximum hand counterclockwise to
pointer stop. If tension is too great or too small, it can be easily adjusted by carefully bending ratchet spring.
c.
Pointer mechanism assembly:
Do not move or tamper with parts of pointer mechanism, as this precision
unit is factory-adjusted with special equipment and is therefore furnished only as an assembly for service.
Tampering with or removing any parts of this assembly will necessitate its replacement. Inspect gears and
shoe for excessive wear. If any parts are defective or damaged, discard entire assembly.
d.
Governor assembly:
Inspect ends of shaft and disk assembly for excessive wear and corrosion. Be sure
spring and flyball links are not broken. If defective discard entire assembly. Carefully inspect tiny steel
bearing balls for wear.
e.
Drive gear assembly:
Check for free turning and for excessive side and end play of shaft in bearing. Check
fiber gear for broken teeth and excessive wear. If defective, discard entire assembly.