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Page Title:
Vertical Bow Measurement -Vehicle Frames ver 20 Feet (Figure 18). |
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 TB 9-2300-247-40
b.
Refer to Figure 16. Measure the distance
up or down, the frame rail is out of
between string (3) and the bottom of frame
tolerance.
rail (1) at the closest point nearest to each
hydraulic jack (2). Adjust string (3) height
d.
Record measurements.
until the measurement at each jack is the
same and the entire length of string (3) is
e.
To verify frame rail tolerance measurement,
unobstructed.
have another qualified shop technician
repeat mark measurement steps a thru c.
c.
Refer to Figure 17. Measure the distance
If second measurements verify frame rail
between string (2) and the bottom of frame
out of tolerance condition, vehicle will be
rail (3) near crossmembers and as close to
classified as unserviceable.
the frame rail centerline as possible. If
frame rail (3) is bowed more than 5/16 inch,
f.
Record second measurement.
Figure 17. Measuring Vertical Bow on Frames Larger Than 20 Feet
NOTE
37.
Vertical Bow Measurement -Vehicle Frames
On vehicles with frames over 20 feet
Over 20 Feet (Figure 18).
in length, the forward (front) 20 feet
a.
Refer to Figure 18 and perform steps a thru
of frames rail is measured separately
f of paragraph above for each 20 foot
from the rear (back) 20 feet of frame
section of frame rail.
rail. The front 20 feet of frame rail will
be measured from front to rear and
b.
If frame rail exceeds the tolerances
the rear 20 feet of frame rail will be
specified, the vehicle will be classified
measured from rear to front. This will
unserviceable.
cause an overlap in measurements.
17
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