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Page 54
CHAPTER EIGHT
SECTION 8.4
MAST PLATE AND DOUBLE TRUSS (continued)
Measure and mark the centerpoint of both the truss boom (PN 10-1618-21) and the truss boom mast
plate as shown in
figure 8.40
. The centerpoint of the truss boom will be 18 inches and the centerpoint
of the truss mast plate will be 4 inches.
Attach one half of the 1.75” aluminum saddles (PN 10-1601-03) and insert the 5/16” x 3-1/4” hex head
bolts as shown in
figure 8.40
. Attach the other half of the saddles onto the bolts and loosely thread on
the 5/16” Nylock nuts (PN 60-0046) as shown in
figure 8.41
.
Slide the truss boom through the saddles, taking care to align the centerpoint measurements with each
other as shown in
figure 8.42
. Rotate the truss mast boom so that the holes on the ends are pointing
downward. These holes are used for installing eyebolts in the next step. Be sure to measure the dis-
tance from each end of the boom to the centerpoint of the mast to ensure accuracy. Tighten firmly.
Install and tighten the set screws.
Figure 8.43
and
figure 8.44
shows the completed truss mast plate assembly.
ATTACH THE TRUSS BOOM TO THE TRUSS MAST PLATE
FIG. 8.43
FIG. 8.41
FIG. 8.40
FIG. 8.42
FIG. 8.44