Published 08-25-09, Control # 077-04 4-21
RT9130E SERVICE MANUAL BOOM
1. Ensure the extend and retract cables are adjusted.
2. Extend the inner mid section out of the base section until
the front grease access holes on the inner mid section
are accessible. The inner mid section can be extended
completely if needed. Extend the center mid section
completely making sure that the outer mid section is
against the stop blocks on the center mid section.
3. Access the check valves through the front grease
access holes on each side of the inner mid section.
4. Left side valve: on the left side of the inner mid section,
adjust the bolt to move the pusher weld causing the
pusher to just contact the valve stem. Continue to adjust
the bolt until the pusher depresses the valve stem
approximately 10 mm (0.39in). Tighten the nut.
5. Right side valve: through the access hole in the inner
mid section on the right rear of the center mid, loosen
the lock nut and adjust the bolt until it just contacts the
valve stem. Continue to adjust the bolt until it depresses
the valve stem approximately 10 mm (0.39 in). Tighten
the lock nut.
Guide Block Adjustment
1. Align and service the boom. Refer to BOOM
ALIGNMENT AND SERVICING in this section.
2. Rotate the guide block at the top and bottom of the inner
mid/center mid section, and outer mid section so that the
guide block is within 0 to 2 mm (0 to 0.078 in) of the
welded block on the top of the next section.
3. Repeat the same for the fly section guide blocks at the
top and left side of the back of the boom nose.
NOTE: The guide block hole pattern is so designed that
the guide block has four mounting positions which
provide 3.175 m (0.125 in) incremental settings.
4. After obtaining proper clearance, tighten the four bolts.
BOOM EXTENSION AND RETRACTION
CABLE
Maintenance
NOTE: For more detailed information concerning
maintenance of the extension and retraction
cables, refer to WIRE ROPE in Section 1 -
INTRODUCTION.
Inspection
The following information is taken from a National
Consensus standard as referenced by Federal Government
Agencies.
All wire rope will eventually deteriorate to a point where it is
no longer usable. Wire rope shall betaken out of service
when any of the following conditions exist.
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:
- 0.4 mm (0.016 in) for diameters up to and including
8 mm (0.3125-in).
- 0.79 mm (0.031 in) for diameters 10 and 13 mm
(0.375 and 0.5-in) inclusive.
- 1.19 mm (0.047 in) for diameters 14 to 19 mm
(0.5625 to 0.75-in) inclusive.
- 1.59 mm (0.063 in) for diameters 22 to 29 mm
(0.875 to 1.125 in) inclusive.
- 2.38 mm (0.094 in) for diameters 32 to 38 mm (1.25
to 1.5 in) 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.
DANGER
Never handle wire rope with bare hands.
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