TM 9-1829A, April 1944
26/100
2021-07-07
(7)
Front jewel bracket:
Check for any out-of-line condition. Make sure threads are in good condition, also
check threads on jewel, and check hair spring regulator for cracks and distortion, especially at the point
where regulator is clamped by front jewel. Clean jewel, using a sharpened match or orange stick.
(8)
Odometer intermediate gear:
Inspect for excessive looseness, worn or damaged teeth, cracks and
distortion.
(9)
Hair spring:
Hair spring must be perfectly flat, free from kinks, and the turns of spring must not touch
each other at any point.
(10)
Odometer:
Inspect for free movement of figure wheels. Check also for chipped surfaces of figure
wheels. If odometer is found defective replace entire unit.
(11)
Miscellaneous parts:
Thoroughly inspect all miscellaneous parts not already specified in the above
paragraphs for cracks, distortion, wear, stripped threads, and for other damage that would make the part
unsuitable for use.
13. Assembly
a.
Install odometer intermediate gear
(fig. 30): Clamp steel block (T-178717 Det. 4) in vise; oil idler stud
with watch and clock oil, and place intermediate gears and stud in position on main frame. Rest head of stud
on steel block and, with punch (T-178717 Det. 3) and hammer, stake over end of stud, making sure, when
finished, that gears turn freely.
Figure 30: Stacking intermediate gear, using fixture (T-178717)
b.
Install magnet:
Place thrust washer on shaft of magnet; apply slight amount of watch and clock oil on washer
and magnet shaft. Insert magnet shaft in main frame, and place thrust washers in position on lower end of
magnet shaft. Place collar on end of shaft with flanged end down and press into place (fig. 31). Flare end of
shaft with tool (T-170666 with Det. 6, fig. 32).
Note: After assembling collar, if magnet is too tight for free
rotation, loosen with special tool (fig. 29). Allow 0.003 inch end play.
c.
Install second gear and bushing:
Lightly clamp shank of main frame in vise. Place one drop of watch and
clock oil on both ends of gear shaft. Place bushing on shaft with beveled end toward gear. Place thrust washer
on other end of gear. Insert into frame, guiding gear into bushing in main frame with tweezers. Seat outer
bushing by tapping. Stake frame over bushing with punch and hammer, spacing three staking points equally
around bushing. Lubricate both gears sparingly with No. 00 grease, O.D.
d.
Install third gear:
Grease third gear and insert lower end in bearing.
e.
Install field plate and speed cup:
Be sure lower staff jewel is clean. Place one drop of watch and clock oil
on lower end of staff. Place speed cup over magnet, inserting lower end of staff into jewel in magnet shaft.
Place field plate over speed cup, tilting it so that flange goes under intermediate gear first. Install field plate
screws and tighten securely.