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TM-9-254 Gearcase Transfer M548 M548A1 (
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Final Adjustment of a Two Piece Eccentric and Level Vial Tube
TM 9-254 3-7. Worm and Worm Gear Mechanisms - Continued (2) The only remedy for this condition is to install a screw that fits snugly in the housing and make sure that the dog-point fits in the slot of the socket. i. Binding.  A binding or uneven movement is caused by a bent worm, the presence of dirt between the worm and worm gear, or by a burr on one of the teeth.  If a burr is present, remove it with a stone, file, or scraper.  Polish the area with crocus cloth, clean and lubricate then assemble the parts and check that the movement is smooth. Section IV.  TUBULAR LEVEL ASSEMBLIES 3-8. Level Vials. a. General.  The ordinary tubular level vial is essentially a straight glass tube closed at both ends and partially filled with a liquid, leaving a small free space or bubble.  The vial must provide the necessary accuracy and durability. b. Uses.    The  tubular  level  vials  are  used  in  instruments  to  establish  a  true  horizontal  position  for  a  known starting point of operation.  Another use is to indicate the angular rotation of a mechanism in a vertical plane.  The purpose of the markings is to indicate when a true horizontal plane exists. c. Eccentric.  The eccentric is an adjustable device to eliminate level vial error during final adjustments of the instrument.  The reasons for using a two piece eccentric or a three piece eccentric are as follows: (1) A two piece eccentric is used to correct for slight defects in the level vial tube and level vial mount when setting up a true horizontal plane. (2 A  three  piece  eccentric  is  used  to  correct  for  slight  defects  in  the  level  vial  tube  and  level  vial  mount when setting up a true horizontal plane that must also be rolled in a vertical axis. d. Removal of Two Piece Eccentric and Tubular Level Vial (fig. 3-24).  The proper method of removing a two piece eccentric and tubular level vial is as follows: (1) Use fabricated eccentric tool (5) (fabricate per fig. C-2, app C) to remove external threaded ring (4) and eccentric (3). (2) Rotate level vial cover (7) to gain access to the viewing slot of the level vial tube (2). (3) Insert a common straight blade screwdriver (6)  or  similar  device  into  the  exposed  viewing  slot  of  level vial tube (2).  Carefully slide level vial tube from bracket (1) and level vial cover (7). (4) Remove straight pin (8) only if necessary to replace. e. Installation of Two Piece Eccentric and Level Vial Tube (fig. 3-24).  The proper method of installing a level vial tube and two piece eccentric is as follows: 3-21

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