BOOM RT9130E-2 SERVICE MANUAL
4-22 Published 11-22-2016, Control # 345-12
Boom alignment is done as the boom sections are being
assembled into one another. A check and fine adjustment is
as follows.
1. Fully extend the boom horizontally.
2. Lubricate the boom bottom channels and top corners.
3. Shim the front top wear pads such that wear pad is just
touching or is no more than 0.078 in (2 mm) from
contacting the next section both at the top and side
surfaces of the top radius.
4. Retract and extend the boom; check for the high point
where the boom has brushed the wear pads at the
widest point.
5. Retract the boom sections to align the high point on the
boom section with the adjacent wear pads.
6. Add or subtract shims as necessary.
7. Attach a weight and extend the boom full length. Check
for side deflection.
Example: If the boom deflects to the left, the top left wear
pad would have shims added and the top right wear pad
would have shims removed.
Cam Operated Check Valve Adjustment
There are two cam operated valves mounted on the back of
the center mid section. When the boom is fully retracted or
the center mid is fully extended and the outer mid is fully
retracted, the valve on the right side of the boom is held open
to supply flow to the second stage of the lower cylinder.
When the center mid is fully extended, the valve on the left
side of the boom opens to supply flow to the upper telescope
cylinder. For a short period of time, both valves are open
because the booms second stage lower cylinder is fully
extended before the upper cylinder starts to extend. As the
outer mid starts to extend, the valve on the right side closes
to shut off the flow to the second stage of the lower cylinder.
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 weldment causing the
pusher to just contact the valve stem. Continue to adjust
the bolt until the pusher depresses the valve stem
approximately 0.39 in (10 mm). 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 0.39 in (10 mm). 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 0.078 in (0 to 2 mm) 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 0.125 in (3 mm) incremental settings.
4. After obtaining proper clearance, tighten the four bolts.
BOOM EXTENSION AND RETRACTION
CABLES
Maintenance
NOTE: For more detailed information concerning
maintenance of the extension and retraction
cables, refer to Wire Rope, page 1-22.
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 be taken out of service
when any of the following conditions exist.
CAUTION
Equipment Damage Hazard!
When extending and retracting the boom during
alignment, movement should be stopped if a restriction is
encountered, and wear pads adjusted as necessary to
provide free travel of the affected boom section(s).
CAUTION
Never handle wire rope with bare hands. Always wear
gloves to prevent cuts or abrasions.
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