TM 9-1829A, April 1944
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2021-07-07
Figure 45: Speedometer mechanism (dial removed)
c.
Remove odometer assemblies:
Pull off outer bronze trip odometer thrust washer with long-nosed pliers.
Remove odometer retaining wire, if used. Slip trip odometer, spring, and drive gear out of frame. The reset
shaft (stiff type) may now be lifted out of frame (flexible reset shaft assemblies are not detached from frame).
Pull off outer bronze total odometer thrust washer. Slip total odometer and drive gear out of frame.
d.
Remove hair spring:
Remove hair spring pin by placing one jaw of long-nosed pliers against small end of
pin, and the other jaw against end of hair spring regulator and squeezing pin out. Disengage hair spring from
regulator with tweezers. Carefully remove hair spring from staff with special puller (T-66296, fig. 46).
Figure 46: Removing hair spring, using Puller (T-66296)
e.
Remove front jewel bracket, speed cup, and third gear:
Remove front jewel bracket by taking out two
screws and lock washers. Speed cup and third gear may now be lifted out.
Caution: Do not lose tiny speed
cup staff thrust washer. It will be either on the staff, or inside the front jewel. Remove front jewel lock nut,
lift off hair spring regulator, and unscrew upper jewel from bracket (fig. 45).
f.
Remove second gear:
Remove second gear bracket by taking out screw and pull out second gear.
g.
Remove magnet (including first gear):
Assemble body of magnet dismantling wrench (T-170654) to
threaded neck of frame, backing off handle so that wrench body will tighten down snugly to frame. Then turn
wrench handle clockwise (fig. 47) until collar is pressed off the magnet shaft. Remove dismantling wrench,