BOOM GRT8100 SERVICE MANUAL
4-46
Published 3/26/2018, Control # 596-05
Should boom chatter or rubbing noises in the boom occur, it
will be necessary to lubricate the telescope cylinder wear
pads. Refer to Lubrication, page 9-1.
Boom Alignment and Servicing
Refer to Lubrication, page 9-1 for the proper lubricant.
Boom alignment is achieved as the boom sections are being
assembled into one another. A check of fine adjustment is as
follows.
1. Fully extend the boom horizontally.
2. Lubricate the boom bottom channels and top corners.
3. Adjust the front top wear pad adjusting bolts such that
wear pad are just touching or are no more than 2 mm
(0.078 in) away from contacting the next inner tele
section. Tighten the jam nuts.
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 tele sections to align the high point on
the boom tele 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.
BOOM EXTENSION AND RETRACTION
CABLE
Maintenance
NOTE: For more detailed information concerning
maintenance of the extension and retraction
cables, refer to Wire Rope, page 1-30
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.
1. In running ropes, six randomly distributed broken wires
in one lay or three broken wires in one strand in one lay.
2. 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 5%.
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.
Cable Tensioning Check and Adjustment
After the boom section is assembled or when interior
proportioning cables appear loose, cable tensioning is
required.
NOTE: Tensioning must be done with the boom in the
horizontal position.
NOTE: When tightening/loosening cables, secure cable
using the flats at the front of the cable ends to
prevent cable twist.
NOTE: All cables must achieve the minimum torque values
as specified in Table 1 in order to insure adequate
cable tensions.
NOTE: Assure that all threaded studs allow nut to thread
on and off by hand. Weld spalls, damage, etc. will
adversely affect torque values.
1. Slightly tighten all cables.
2. Fully retract the boom.
3. Tighten the tele 4 retract, tele 4 extend, tele 3 retract,
and tele 3 extend cables (in order listed) to remove
excess slack from the cables.
4. Torque the Tele 4 retract, Tele 4 extend, Tele 3 retract,
and Tele 3 extend cables (in order listed) to the minimum
torque values as specified in Table 1.
5. Extend and retract the boom fully. Tele sections 3 and 4
should bottom out on their respective stop blocks 3mm
to 4mm prior to tele 2 bottoming out on tele 1. Adjust
retract and extend cables using following procedure to
CAUTION
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 tele section(s).
CAUTION
Wear gloves when handling wire rope. Moderate to minor
injury may result if using bare hands.
CAUTION
When tightening/loosening the cables, secure cable using
the flats at the front of the cable ends to prevent cable
twist. Do not use an impact wrench. Do not turn cable.
Turning the cable while adjusting will result in damage or
failure of the cable.
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