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Section IV.  TUBULAR LEVEL ASSEMBLIES
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 3-24. Level Vial with Two Piece Eccentric
TM 9-254 3-8. Level Vials - Continued CAUTION Straight pin (8) must not protrude more than one-sixteenth of an inch into the vial hole. (1) If removed, press or drive straight pin (8) into bracket (1) so that the straight pin protrudes far enough into the level vial hole to engage the level vial tube (2). (2) Position the level vial cover (7) into bracket (1).  Slide the level vial tube (2) into the bracket and cover so the slot in the end of the level tube engages the straight pin (8). (3) Install  eccentric  (3)  and  external  threaded  ring  (4)  into  bracket  (1)  but  do  not  tighten  pending  final adjustment. f. Final Adjustment of a Two Piece Eccentric and Level Vial Tube (fig. 3-24).  The final adjustment of the level assembly is performed after it has been installed on the instrument and set up on the cross-leveling and elevation fixture. (1) Engage fabricated eccentric tool (5) to the external threaded ring (4). (2) Insert a common straight blade screwdriver (6) through the center hole in the fabricated eccentric tool (5) and engage eccentric (3). (3) Adjust eccentric (3) until the level vial bubble is centered within the graduations on the level vial tube (2). (4) Hold the eccentric (3) firmly in place while turning fabricated eccentric tool (5) with a wrench to tighten external threaded ring (4).  Be careful not to disturb the setting of level vial tube (2). g. Removal of Three Piece Eccentric and Tubular Level Vial (fig. 3-25).  The proper method of removing a three piece eccentric and tubular level vial is as follows: (1) Using a fabricated eccentric tool (8) (fabricate per fig. C-3, app C) to remove ring (7), eccentric ring (6), and eccentric (5). (2) Rotate level vial cover (1) to gain access to the viewing slot of the level vial tube (4). (3) Insert a common straight blade screwdriver or similar device into the exposed viewing slot of level vial tube (4).  Carefully slide level vial tube from machined rocker (3) and level vial cover (1). (4) Remove straight pin (2) only if necessary to replace. 3-22

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