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Section I.  DRILLING AND REAMING FOR TAPERED PINS
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Removal of Tapered Pin
TM 9-254 3-1. Tapered Pins and Tapered Holes - Continued Table 3-1.  Tapered Pins and Drill Sizes Reamer and pin number Length of pin (in.) 6/0 5/0 4/0 3/0 2/0 0 1 2 3 4 5 3/8 50 44 38 32 29 1/2 51 45 39 33 30 27 5/8 52 46 41 34 30 27 21 3/4 1/16 47 42 7/64 1/8 9/64 5/32 16 13/64 15/64 1 1 49 44 37 31 29 25 11/64 9 1 H 1-1/4 32 30 26 19 10 2 G 1-1/2 1/8 9/64 20 3/16 7/32 F 1-3/4 31 29 5/32 14 3 E 2 33 30 25 16 4 D 2-1/4 7/64 1/8 26 11/64 13/64 C 2-1/2 37 31 28 19 8 B 2-3/4 40 33 29 21 11 1 3 42 35 30 5/32 3/16 2 3-1/4 24 14 2 3/1-2 26 16 3 3-3/4 17 4 4 19 5 d. Precautions Before Installing Pin.  Before securing two parts with a tapered pin, always check the direction of the taper.  Slip the pin loosely in the hole from either side.  It should be driven into the side in which it enters most deeply. When securing two parts which have been previously drilled and reamed for a tapered pin, such as a wormshaft and knob, check  the  direction  of  the  taper  in  both  parts  and  assemble  accordingly.    The  parts  should  have  been  marked  during disassembly to insure that they are assembled in the same position.  Failure to follow the practice of checking the direction of  taper  in  the  parts  may  cause  damage  to  the  parts  when  the  pin  is  driven  in  and  possibly  make  the  instrument unserviceable 3-2

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