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 TB 9-2300-247-40
NOTE
i.
Leave papers (3) with fixed point (5) marks
To ensure accurate measurements,
in place for next procedure.
check that plumb bob string is placed
flat against frame rails, is free of
j.
Refer to Figure 6. Stretch string (3) tightly
obstructions such as bolts, nuts,
on the shop floor between the front and
rivets, brackets, and rear springs.
rear plumb bob fixed point marks (2) under
each frame rail (4). Place hydraulic jacks
c.
Refer to Figure 7. Hold string of plumb bob
(1) on string (3) to keep string tight.
(2) above paper (3) to outside of frame rail
(1) making sure that plumb bob string is
NOTE
placed flat and unobstructed against frame
Strings used for horizontal bow
rails.
measurements will remain in place
until the frame squareness task is
d.
Adjust plumb bob (2) to hang above paper
completed. On vehicle frames longer
(3), 4 inches from bottom of frame rail (1).
than 20 feet, the two front to rear
e.
Carefully locate a fixed point on paper (3)
strings will be used.
directly below plumb bob (2).
33.
Measuring Marks (Figure 8).
f.
Using pencil, carefully mark fixed point on
paper (3) directly below plumb bob (2)
a.
Measure the distance between string (3)
point.
and each plumb bob mark (2). If the
distance is more than 1/2-inch at bow
g.
Leave papers (3) with fixed point marks in
measurement (A) or 1/2-inch at bow
place for next procedure.
measurement (B), frame rails (1) are out of
tolerance.
h.
Repeat steps a thru g above for other frame
rail (1).
Figure 8. Measuring Marks
11
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