TM 9-1829A, April 1944
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2021-07-07
21. Cleaning, inspection, and repair of parts
a. The procedure for cleaning, inspection, and repair is the same as for SPA-series. Refer to paragraph 12.
22. Assembly
a.
Install magnet:
Grease (using ST-263-36) magnet shaft its full length and spread grease over entire bearing
surface. Place thrust washer on magnet shaft with tang toward main frame, so it will engage with one frame
web to prevent it from turning. Insert magnet shaft in main frame and place thrust washer on end of shaft.
Place collar on end of shaft and press into place (fig. 31). Inspect to make sure there is enough metal left on
end of shaft for proper flaring. When a new shaft is used it may be necessary to use more than one thrust
washer under the collar. Flare end of the shaft with tool (T-170666) (fig. 32). Adjust magnet shaft end play
to 0.002 inch by flaring shaft so it is tight. Insert feeler gage between shaft collar and frame and loosen shaft
slightly with magnet removing tool until the gage fits easily. Use a combination of the flaring tool and magnet
removing tool (fig. 42) to adjust end play to a gage fit of 0.002 inch. Move feeler gage all around the shaft to
make sure there are no tight spots. The magnet must turn freely after adjustment has been made.
b.
Install second gear:
Grease both bearing surfaces and gear surface with No. 00 grease, O.D. Place thrust
washer on inner end of shaft and insert in main frame. Install outer bearing, beveled side in, and seat bearing
in proper position with hammer and drift. Check end play of second gear and install thrust washers, if
necessary, to get 0.005 to 0.010 inch end play. Stake frame over bushing at three equally spaced places around
bushing (fig. 43).
Figure 43: Staking second gear bushing, using installer (ST-263-35)
c.
Install speed cup and field plate:
Clean the rear jewel in top of magnet. Clean speed cup staff. Put one drop
of watch and clock oil on lower end of speed cup staff. Place speed cup in position over magnet, making sure
lower end of staff enters jewel in top of magnet shaft. Place field plate over speed cup. Bend edges of field
plate over with pliers. Make sure assembly runs true after crimping.
d.
Install third gear:
Grease bearing surfaces and gear surface. Place washer on lower end of shaft and install
gear in frame.
e.
Install front jewel bracket, hair spring and odometer
(par. 18 f, g, h, and i).
f.
Install trip odometer:
Proceed as with total odometer and then install reset bracket on main frame.
g.
Install dial:
Fasten in place with dial screws, taking care not to mar dial.
h.
Install pointer:
Bend pointer stop arm slightly back of zero position, hold speedometer in same position as
it will be when installed on the vehicle, float pointer exactly on zero and tap pointer in place on staff.
i.
Calibrate:
Refer to paragraph 14.
j.
Install case
(do not install until after calibration): Install felt washer on reset stem (SPK-type only). Place
dust washer over shank of main frame and install case screws. Install reset knob or cable.
k.
Install bezel and glass
(do not install until after calibration): Before installing glass or bezel make sure dial
and glass are clean. Install glass and bezel, using special tool (T-178730, figs. 74 and 75).