MD8 MAIN BOOM INSTALLATION
17
The MD8 main boom assembly, Fig. 1, is shipped with
the retaining pins and bolts installed. It will be
necessary to remove the pins and bolts as the main
boom is being assembled to the main frame. The main
boom should be attached to the swing shaft as follows:
(1) Remove the 1” x 10 ½” plated bolt (Item 15 in the
main frame assembly) and the 1” I.D. x 1 5/16” O.D. x
5” spacer (Item 17 in the main frame assembly) from
the yoke of the swing shaft. Position the base end of the
main boom (Item 1) between the mounting ears (use two
men or overhead hoist) and insert the spacer
between the boom swivel lugs. Re-insert the 1” x
10 ½” plated bolt through the yoke ears, spacer and the
boom swivel lugs as shown in Fig. 2. The head of the
bolt should be seated (or locked) against the shoulder
on the outside surface of the mounting ears to prevent
the bolt from turning during operation. Fasten the bolt in
place with the 1” self-locking hex nut and tighten for
tight fit but not sufficiently to warp the yoke mounting
ears.
Fig. 2
(2) Mount the base end of the main boom cylinder (Item
2) with flat top end of the swing shaft between the ears
on the cylinder clevis. Secure the cylinder with the ¾”
x 2 ¾” cylinder pin (Item 3) and two cotter pins (Item 4)
as show in Fig. 3.
Fig. 3
(3) Install one each of the SAE 6 O-Ring to JIC 6 Flare
Straight adapter fittings (Item 1 in box parts list, page
5) in both ports of the crowd cylinder.
1
17
15
4
2
3
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