TM 9-1829A, April 1944
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2021-07-07
(4)
Run calibrating machine at 167 revolutions per minute (10 miles per hour) and make any necessary
adjustments at this speed by varying the position of the hairspring regulator so that the speedometer
shows a reading as shown in specifications (par. 14 d).
(5)
Check speedometer indications at 500 revolutions per minute (30 miles per hour) and 1,000 revolutions
per minute (60 miles per hour). They should be within specifications (par. 23). If not, the process of
magnetizing, demagnetizing and balancing should be repeated to obtain the desired calibration.
(6)
Bend pointer stop to bring pointer exactly to zero. After correct calibration has been obtained there will
be a calibrated bank of three miles per hour against the stop.
d.
Test data:
(1)
Index.
Part no.
Test no.
SPA-4026
1
SPA-4040
2
SPJ-4001
1
SPJ-4004
2
SPK-4001
3
SPK-4001A
3
SPK-4001B
3
SPK-4002
3
SPL-4001
1
SPM-4003
2
SPP-4001
4
SPR-4001
3
(2)
Tests.
Master
mph
10
30
60
90
rpm
167
500
1000
1500
2000
Test 1 (mph)
9-11
28.5-30.5
61-63
93.5-97
-
Test 2 (mph)
8.5-10.5
28-30
60-62
92.5-96
-
Test 3 (mph)
9-11
30-32
60-63
-
-
Test 4 (rpm)
337-387
1010-1060
2020-2070
3030-3105
4040-4140
e.
Resetting odometer:
Hold odometer in left hand, with tenth figure wheel to the right. Hold highest figure
wheel between thumb and first two fingers, with pinion carrier between the two fingers. Turn the next figure
wheel until correct figure on highest figure wheel is in proper position to show through opening in dial. Then
move fingers along to hold pinion carriers for next figure wheel and proceed as above. Continue until desired
total mileage is obtained, then reinstall odometer in front jewel bracket.