Figure 5-1. Blocking and tiedown of the RTCC superstructure on the M747 semitrailer (sheet 4 of 7).

TM 55-3810-306-15

(continued)

NOTES:

3. Suspension and fifth wheel loads shown are

1. Loading sequence: Install the track layering and

from actual weighing of loaded RTCC

crossbeams where indicated. Crossbeams are

superstructure

MS52162

semitrailer.

bolted through layering and metal tracks. Spike

Weights may vary slightly because of variations

unbolted crossbeams to the track layering (see

in blocking materials and components.

note 7 below). Spike the slide plates to the

turntable crossbeams (see view E-E, sheet 7) as

shown. Build and bolt the laminated block

4. Cushion and secure floodlights, wipers, mirrors,

assembly to the bottom surface of the turntable

and fans with tape.

bearing. Locate the holes in the laminated

block by means of a cardboard template made

5. See superstructure demount

procedure

from the hole spacing in the bearing. Bolts,

appendix A for disassembly.

nuts, and washers that were removed during the

demount of the superstructure may be used for

6. Each tiedown shown is a single length of .62-

bolting the superstructure to the laminated block

inch diameter wire rope looped through a trailer

assembly. Lower the superstructure onto the

pocket or ring and crane lug. Ends are joined as

semitrailer so that the laminated blocking

shown in detail A. Tension all ropes to 3,000

contacts the slide plates. Position the load

pounds and torque rope clamp nuts to 95-foot-

longitudinally as shown, and center it laterally.

pounds.

Support the boom so that the top surface of the

boos is level with the trailer. Build and install

the counterweight and boom support structures

7. Wood joints in structures, planking, beams, and

as shown to fit the leveled load. Install the

supports, where bolting is not specified, shall be

tiedowns as shown (see note 6 below).

assembled using nails as follows: Nail through

turntable block laminations using sixteen 20d

nails. Nail slide plate members through into

2. RT875CC superstructure load consists of

crossbeams using 20d nails. Where toenailing

components shown, including superstructure,

is required to assemble 4 by 4, 4 by 6, 4 by 8,

44,191 pounds; main hook block, 758.5 pounds:

and 6 by 8 beams, stakes, blocks, or to join

and overhaul ball, 229 pounds. This equals

beams or blocks or stakes to planking or

45,178.5 pounds plus blocking and tiedowns.

crossbeams, use 30d nails and predrill top

member of joint to .156-inch diameter.

Figure 5-1. Continued (sheet 4 of 7).

5-6