TM 9-1240-401-34&P
I
4-14. DISK ASSEMBLY MAINTENANCE INSTRUCTIONS - continued
c. Assembly - continued
14 Install cover (5) between bosses and slide level (3)
into disk assembly (4).
15 Using fabricated eccentric tool, install cell (2) and
threaded ring (1). Do not tighten pending final ad-
justment.
I d. Adjustment
I
1
Install perpendicularity gage (33) on M145/M145A1
telescope mount (34) or use two parallel bars
across body of mount if perpendicularity gage is
not available.
Level the cross-leveling fixture in elevation and
2
cross-level.
3
Set the zeroed M1A1 gunner's quadrant (35) on
the perpendicularity gage (33).
Adjust pitch knob (36) until M1A1 gunner's quad-
4
rant level (37) bubble is centered.
5
Adjust elevation handwheel (36) until elevation
counter (39) reads zero.
6
Engage fabricated eccentric tool to the threaded
ring (1).
7
Insert a common straight blade screwdriver
through the center hole in fabricated eccentric tool
and engage cell (2).
8
Adjust cell (2) until the level (3) bubble is centered
within the graduations on level (3).
Hold cell (2) firmly in place while turning fabricated
9
eccentric tool to tighten threaded ring (1). Be care-
ful not to disturb the setting of level (3).
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