11-1
5540F/YB5515 SERVICE MANUAL STRUCTURALS
SECTION 11
STRUCTURALS
BOOMS
General
The three section boom as well as the four section boom is
hydraulically extended and retracted by a dual telescope
cylinder inside the boom.
Extending the Fourth Boom Section
1. Extend the outriggers.
2. Lower the boom to its horizontal position.
3. Completely retract the boom.
4. On the left side of the boom, remove pin “A”
(Figure 11-1) from hole “D” by first removing the snapper
pin retaining pin “A” and then the pin.
5. Hook the handle of pin “A” in hole “B”.
6. Fully extend the fourth boom section (Figure 11-2), by
actuating the telescope control lever in the cab.
7. Retract the telescope cylinder (Figure 11-3) The fourth
section will remain in the extended position.
8. Unhook the handle of the pin “A” from hole “B”
(Figure 11-2).
9. Install pin “A” into holes “D” and “E” (Figure 11-3). Install
the snapper pin to retain pin “A”.
Reference Only
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