Grove Published 11-22-2016, Control # 345-12 4-23
RT9130E-2 SERVICE MANUAL BOOM
1. In running ropes, six randomly distributed broken wires
in one lay or three broken wires in one strand in one lay.
2. Wear of one-third the original diameter of outside
individual wires. Kinking, crushing, bird caging, or any
other damage resulting in distortion of the rope
structure.
3. Evidence of any heat damage from any cause.
4. Reductions from nominal diameter of more than:
- 0.016 in (0.4 mm) for diameters up to and including
0.3125 in (8 mm).
- 0.031 in (0.79 mm) for diameters 0.375 and 0.5 in
(10 and 13 mm) inclusive.
- 0.047 in (1.19 mm) for diameters 0.5625 to 0.75 in
(14 to 19 mm) inclusive.
- 0.063 in (1.59 mm) for diameters 0.875 to 1.125 in
(22 to 29 mm) inclusive.
- 0.094 in (2.38 mm) for diameters 1.25 to 1.5 in (32
to 38 mm) inclusive.
5. In standing ropes, more than two broken wires in one lay
in sections beyond end connections or more than one
broken wire at an end connection.
Adjustment
At near fully extended boom length, during sudden extension
after retracting the boom some distance, and with high
telescoping speeds, the extension cables may slap the
inside of the boom section. This will make a somewhat
audible noise, however this will not cause any damage and is
acceptable. If the cables do not make a slapping noise under
these conditions, it is an indication that the extension cables
may be too tight and should be readjusted. Be aware that
there may also be a similar noise made by the telescope
cylinder rod mount at the rear of the base section and center
mid section and confusion between the two could be
experienced.
NOTE: The extension cables must be adjusted properly
before the retract cables can be adjusted.
1. Extend and set the outriggers, ensuring the crane is
level.
2. Ensure the boom is over the front and at a horizontal
position (boom angle elevation 0 degrees or lower).
3. With the inner mid section completely retracted extend
the center mid section until the large access hole at the
front of the center mid is lined up with the large access
hole in the outer mid section.
4. With the front of the boom in the above position extend
the boom approximately 1 in (25 mm) to relieve the
tension in the retract cables. Access the retract cables
from the front of the boom nose and view the slack of the
retract cables through the hole in the back of the boom
nose. Using the nuts on the retract cables, remove slack
evenly, until both retract cables are at least 25 mm (1 in)
above the lower leg of the cable retainer bars on the
cylinder foot support on the upper telescope cylinder.
5. Retract the boom approximately 1 in (25 mm) to relieve
tension on the extension cables. Shut down the crane.
Access the extension cable adjusting bolts through the
access hole in front of the center mid section. Evenly
tighten the swivel nuts on the adjusting bolts, until the
extension cables are up to 6 in (150 mm) off the top of
the bottom pad plate at the back of the fly section. Look
through the access hole on the center mid section.
6. Lock the adjustments with the jam nuts.
7. Extend the boom until the outer mid/fly extends several
inches (cm).
8. Retract the boom until either the fly section just contacts
the outer mid stop block or the outer mid section just
contacts the inner mid stop block.
9. Check the gap between the stop blocks and the boom
sections. If there is a gap between the center mid
section’s stop block and the outer mid of more than
0.125 in (3 mm), loosen the retract cable. If there is a
gap between the outer mid section’s stop block and the
fly section, tighten the retract cable slightly.
10. Extend the boom approximately 6 in (150 mm). Retract
the boom again until one of the stop blocks just contacts
its boom section.
11. Again check the gap as in step 10 and if necessary,
make further adjustments.
12. Repeat steps 11 and 12 until there is a 0.125 in (3 mm)
gap at the outer mid section’s stop block when the fly
section’s stop block has just made contact.
13. Lock the retract cable adjustments with the jam nuts.
CAUTION
When adjusting cables, hold the cable end and turn the
nut. Do not turn cable. Turning cable while adjusting will
result in damage or failure of cable.
CAUTION
Over tightening of the retract cable will damage the cable.
Take care when retracting the boom fully, while adjusting
the cable, to avoid full boom retraction if the fly section
contacts its stop block more than 0.125 in (3 mm) before
the outer mid section contacts its stop block on the inner
mid.
To Next Page
Loading...
Need help?
General
