TM 5-3810-306-34
c. Check top width at 4 foot intervals along
boom section length.
d. Check squareness of boom section by
placing square as shown in B. Measure
dimensions for top plate to square on both
sides of section at same interval. The
amount boom is out of square is 1/2 of
difference between left and right check
dimensions.
C. CHECKING
SWAY/SWEEP
OF
BOOM
SECTION
5. BASE PLATE
6. CHECK DIMENSION
7. SPACERS
8. CORD
NOTE
The boom must be in travel position
when checked.
f. Check camber. An upsweep condition is
negative camber and a downsweep
condition is position camber. Use drill
rods and cord as shown in D. Check at
four foot intervals.
B. CHECKING
SQUARENESS
OF
BOOM
SECTION
3. CHECK DlMENSION
4. SQUARE
e Check sway/sweep by placing spacers of
equal thickness against base plate edge at
D
both ends and draw a cord tightly over
D. CHECKING
POSITIVE
AND
NEGATIVE
them as shown in C. Check distance
CAMBER
between cord and top plate at four foot
9. BASE
intervals. Record measurements.
10. DRILL ROD
11. CHECK NEGATIVE CAMBER
12. CORD
13. CHECK POSITIVE CAMBER
15-17
