BOOM RT9130E SERVICE MANUAL
4-6 Published 08-25-09, Control # 077-04
extension of the sections, an indictor light on the console
remains illuminated as long as the unsynchronized condition
persists, and the inner mid or center mid section telescope
cylinder selection is indicated by respective lights on the arm
rest, thereby allowing the operator to telescope the section[s]
appropriately). As long as the system continues to detect the
unsynchronized condition, and/or the manual mode is
selected, the load moment monitoring/lockout system also
limits the allowable load moment to 10,000 kg or 50% of the
rated capacity at the particular prevailing boom length, the
intent being that, while the sections are unsynchronized, any
hook load will be deposited, only the hookblock remaining
suspended while the necessary adjustment of the boom
sections occurs: only when synchronization has been
achieved will the system reset and normalize the load
monitoring system when switched back to Automatic mode.
The standard used by the system to define an
unsynchronized condition is an error or +/-3% of the full
extension value of one section. Since the inner mid, center
mid, and the outer mid/fly combination all extend individually,
compliance with the criterion can only be assessed at
section extensions corresponding to the points of
changeover of movement from section to section. Therefore,
the system reviews the extension of each section prior to
permitting the changeover, and unless all section extension
values are within 3% of their programmed changeover
length, the system defaults to the out-of-synchronization
condition described above. The same default occurs if, in the
course of operation, any boom section moves out of
synchronization to a length corresponding to one of its own
changeover lengths (since it then invokes the +/-3% criterion
against the other sections), or moves away from such a
changeover length by more than the 3% margin.
MAINTENANCE
Removal
NOTE: The boom weighs approximately 16,606 kg
(36,610 pounds). Removal of the swingaway boom
extension will simplify boom removal, therefore, the
above weight is for the boom without the
swingaway boom extension attached.
1. Extend and set the outriggers to level the crane and
ensure the boom is fully retracted and in a horizontal
position over the front of the crane.
2. If equipped, remove the swingaway boom extension and
aux nose according to the removal procedures in this
section.
3. Remove the hook block or headache ball and wind all
the wire rope onto the hoist drum.
4. Position the boom to make sure that the lift cylinder is
resting securely in the lift cylinder support.
5. Attach a lifting device to the boom to provide for equal
weight distribution.
6. Tag and disconnect any electrical wiring from the boom.
7. Tag and disconnect the hydraulic lines to the lower
telescope cylinder and plug.
8. Remove the capscrews, washers and nut fasteners
securing the base cover to the top of the boom base
section near the pivot shaft. Remove the cover.
9. Secure the hose reel in the turntable to prevent the reel
from rotating before proceeding to the next step. Reach
through the hole in the top of the base section and
disconnect the hose reel lines from the hydraulic
manifold that is mounted on the rear of the center mid.
Cap all lines and openings. Feed the hoses through the
rollers at the rear of the base.
10. Block the lift cylinder.
11. Remove the capscrew and washer securing the upper
lift cylinder shaft to the side of the attach fitting on the
boom.
12. Insert the pump lever (found in cab) into the hand pump
located on the left side of the boom. Turn the pump flow
control lever clockwise and pump the lever until the
upper lift cylinder pin is clear of the boom’s left side lift
cylinder attachment lug. The lift cylinder may need to be
raised or lowered to aid in the release of the lift cylinder
pivot shaft from the attachment lug. This can be done by
using the jack on the lift cylinder support.
13. Once the shaft is clear of the attachment lug, activate the
hydraulic system and retract the lift cylinder enough to
clear the attachment lugs. For removal of the lift cylinder
from the crane refer to the removal procedures outlined
in LIFT CIRCUIT - Removal in this section.
14. Take up the slack on the boom lifting device.
DANGER
Wear gloves when handling wire rope.
DANGER
Ensure blocking and lifting devices are capable of
supporting the boom assembly.
DANGER
Ensure the boom lift cylinder is properly supported before
disconnecting it from the boom.
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