Table 3-1. Troubleshooting

TM 5-6675-329-13 & P

Table 3-1. Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

CIRCULAR LEVEL (8, FIGURE 1-2) BUBBLE DOES NOT REMAIN CENTERED WHEN INSTRUMENT IS

ROTATED THROUGH 360

Step 1.

Check that footscrews (2, Figure 1-2) have not moved.

Step 2.

Check that Tripod Assembly GST-40 leg (s) (4, Figure 1-3) has not moved.

Readjust footscrews to center bubble at Automatic Level position (s) where it

goes off center. Re-rotate Automatic Level NA2 through 360 If bubble still

goes off center, this indicates that footscrews have not moved, and circular level

requires readjustment. Refer to Maintenance Section III.

There should be no play between the various components of the Tripod

Assembly GST-40. The hexagonal key kept in the tripod pouch should be used

to tighten up the tripod screws when necessary. The hinges between the tripod

head and the legs can be adjusted; they should be sufficiently stiff so that when

the tripod is lifted by its head the legs just remain spreadout.

LINE OF SIGHT DOES NOT REMAIN HORIZONTAL.

Step 1.

Check that circular level (8, Figure 1-2) bubble is centered.

Step 2.

Press test pushbutton (7, Figure 1-2) and observe image movement in eyepiece (6).

The circular bubble is in correct adjustment when it stays in the center of the

circle in whatever

3-2