Manitowoc Grove GRT880, Operator'S Manual

Page: 155 / 202

Grove
Published 3-25-2020, Control # 643-04
4-13
GRT880 OPERATOR MANUAL SET-UP AND INSTALLATION
4
25. Connect the anti-two block cable(s). Refer to
Connecting and Disconnecting Boom Extension,
page 4-21
.
26. If only the boom extension base section is erected,
remove cable retainer pins and clip pins from the boom
extension base section sheave.
If the boom extension fly section is erected, remove
cable retainer pins and clip pins from the boom
extension fly section sheave.
NOTE: Hoist cable shall not be routed over the boom
extension base section sheave when using the
boom extension fly section.
27. Route hoist cable over mast sheave, then reinstall cable
retainer pin and secure with clip pin.
If only the boom extension base section is erected, route
cable over boom extension base section sheave, then
reinstall cable retainer pins and secure with clip pins.
If the boom extension fly section is erected, route cable
over roller at rear of boom extension fly section, then
over boom extension fly section sheave. Reinstall cable
retainer pins and secure with clip pins.
NOTE: Do not reeve hoist cable through sheaves on boom
nose.
28. Rig hoist cable.
29. If required, set boom extension offset to 20° or 40°.
Refer to
Setting Boom Extension Manual Offset,
page 4-16 .
Erecting Boom Extension Fly Section
Refer to Figure 4-20.
1. Attach rope to tip of boom extension fly section to help
swing it around to the front of the boom extension base
section.
2. Ensure attachment pin securing the right side of the
boom extension base section to the boom extension fly
section is in place.
3. Position boom to horizontal.
4. Remove retainer clip (2, Figure 4-15) and remove pin (1)
5. .Slightly raise or lower boom to help control boom
extension fly section swing. Using rope attached to tip of
boom extension fly section, swing it in front of the boom
extension base section until boom extension fly section
attachment fittings engage with the left side boom
extension base section anchor fittings.
6. Install attachment pin into left anchor and attachment
fittings of the boom extension base section and boom
extension fly section. Secure attachment pin with
retaining clip.
7. Lower boom and remove rope from tip of the boom
extension fly section.
Stowing Boom Extension
NOTE: Boom extension must be set at 0° offset. Refer to
S e t t i n g B o o m E x t e n s i o n M a n u a l O f f s e t ,
page 4-16
.
Refer to Figure 4-20.
1. Fully extend and set outriggers.
2. Position boom over front of crane.
3. Fully retract all boom sections.
4. Set offset to 0° if not already done so. Refer to Setting
Boom Extension Manual Offset, page 4-16 .
5. Lower boom to minimum elevation.
6. Lower front outriggers until front wheels are on ground.
7. If the boom extension fly section is erected:
a. Remove the clip pins and cable retaining pins at the
boom extension fly section sheave, then remove the
hoist cable. Reinstall cable retaining pins and
secure with clip pins.
b. If only the boom extension base section is erected,
remove the clip pins and cable retaining pins at the
boom extension base section sheave, then remove
the hoist cable. Reinstall cable retaining pins and
secure with clip pins.
c. Remove the clip pin and cable retaining pin at the
mast sheave (6, Figure 4-20), then remove the hoist
DANGER
When erecting the boom extension fly section, ensure all
personnel and equipment are kept clear of swing path.
Uncontrolled movement of the boom extension fly section
can cause death, injuries, or damage to equipment.
6642-24
1
FIGURE 4-15
2