Manitowoc Grove RT770E Service Maintenance Manual page 194

BOOM
8. Pull down on the handle to disengage the spring loaded
boom stop block. Place the end of the handle in the
retainer plate. Fully retract the boom.
NOTE: When the boom retracts, the handle will be
released allowing the stop block to engage when
the boom is extended.
NOTE: The length indication on the rated capacity limiter
(RCL) will display 0 (zero) when the spring-loaded
stop block is in the working position (engaged) and
the boom is fully retracted. During the process of
stowing and erecting the boom extension, the RCL
may display a negative dimension when the stop
block is retracted (disengaged) and the boom is
fully retracted.
1
2
Item
1 Boom Extension
2 Boom Nose
3 Alignment Jack
9. Remove the retainer clips from the attachment pins
stowed in the base of the boom extension and insert the
attachment pins through the attachment and anchor
fittings on the right side of the boom nose. Install the
retainer clips in the attachment pins.
CAUTION
If the boom extension fly section (stinger) is not to be
erected, it should remain on the stowage brackets on the
side of the boom.
4-50
8177-2
3
Description
FIGURE 4-62 continued
Published 11/26/2014, Control # 447-05
RT770E SERVICE MANUAL
10. Attach a length of rope to the extension base section tip
to aid in the extension of the swingaway into place
ahead of the boom nose.
NOTE: If erecting the boom extension fly section with the
boom extension base section, skip to step 15. If not
erecting the boom extension fly section, perform
steps 11 to 14.
11. Remove retainer clip from base to fly attachment pin and
remove attachment pin from base section to fly section
attachment fittings.
12. Stow the pin in the opposite attach fitting or the stowage
lug.
13. Ensure the pin attaching the fly section to the boom base
section rear stowage bracket (Figure 4-62), (Detail D) is
in place.
14. At fly section sheave end Figure 4-62, (Detail E) push in
on the spring loaded latch hook to release latch, allowing
the base to separate from the fly. Skip to step 16.
15. Remove the pin attaching the fly extension section to the
boom base section rear storage bracket ((Figure 4-62),
(Detail D)). Ensure that the latch hook at the fly section
sheave end ((Figure 4-62), (Detail E)) is latched.
16. Remove the lock hitch pin securing the extension base
to the front stowage bracket ((Figure 4-62), (Detail A)).
Stow lock hitch pin in lug provided.
17. Raise the boom to slightly above horizontal, then extend
the boom until the extension is clear of the guide ramps
and stowage pins on the front and rear stowage
brackets.
When erecting the boom extension, ensure that all
personnel and equipment are kept clear of the swing path.
18. Slightly raise and/or lower the boom to help control the
extension. Using the rope attached to the tip of the
extension, swing the extension into place ahead of the
boom nose, engaging the anchor fittings with the
attachment fittings on the left side of the boom nose.
Do not modify the attach points to permit the installation of
the attach pins.
19. Install the attachment pin into the upper left anchor and
attachment fitting of the boom nose. Install retainer clip
in attachment pin.
DANGER
DANGER