BOOM MAINTENANCE 1300A
4-6 01-22-2019 Control # 051-08
5. Loosen and remove the two capscrews functioning as
the upper retract cable keepers. Remove the retract
cables.
6. Loosen and remove the two capscrews securing the
lock bar to the extend cylinder collar. Remove the bar.
NOTE: The lock bar constrains the vertical movement of
the extend cylinder.
7. Loosen the capscrews that secure the extend cable
anchor to rear of the 4
th
section.
a. Total removal of the capscrews allow the cable
anchor to be completely disassembled.
b. Back the capscrews out about 0.50 inch (12 mm) to
allow the anchor assembly to slide back out of the
section as the telescope cylinder is removed.
8. Support the telescope cylinder with an appropriate lifting
device and pull the telescope cylinder out of the boom to
within 3 feet (91 cm) of complete removal from the boom
sections.
NOTE: Keep the extend cables tensioned slightly by hand
to minimize the possibility of damage to the cables.
9. Reach into the rear of the 4
th
section and pull the extend
cable anchor out from its retaining pocket on the bottom
of the 4
th
section. A slight angle applied to the anchor as
it’s being pulled to the rear permits easier removal
through the 2
nd
and 3
rd
sections.
10. Remove the telescope cylinder and cables from the
boom. Place cylinder and cables in a safe place to keep
them from being damaged.
11. Loosen and remove the two capscrews, wear pad, and
cable guide from the front top of the 2
nd
section.
12. Loosen and remove the capscrews attaching the bottom
cable retainer plate to the 2
nd
section. Slightly lift the 3
rd
section and remove the retainer plate.
13. Slide the 3
rd
section out of the 2
nd
section. The side
pads may need to be removed. Tag and remove the side
pads and shims if required.
14. Loosen and remove the two capscrews, cable guide,
wear pad, and spacer bar from the front top of the 3
rd
section.
15. Loosen and remove the four capscrews attaching the
bottom pad plate to the 3
rd
section. Slightly lift the 4
th
section and remove the pad plate.
16. Slide the 4
th
section out of 2
nd
section. The side pads
may need to be removed. Tag and remove the side pads
and shims if required.
17. Loosen and remove all remaining capscrews and wear
pads.
Additional Maintenance, Disassembled
Boom
1. Clean all boom sections and inspect for wear, dents,
bent or crooked sections, gouged metal, broken welds,
or any abnormal conditions. Repair or replace as
required.
2. Inspect all sheaves for excessive groove wear or
abnormal rim wear. Replace as required.
3. Inspect all sheave bearings for excessive wear or cut
inner liner material. If the bearing diameter is 0.015 inch
(0.38 mm) larger than pin diameter, the bearing must be
replaced. Any cut or gouge which causes the bearing
liner to lose strands is cause replacement.
4. Clean and inspect all cable assemblies and replace
cable assemblies as required. Lubricate all cable
assemblies before reinstalling in boom.
5. Inspect all sheave pins for nicks, gouges or pitting due to
rust in the bearing surface area. Replace if any damage
is evident.
6. Inspect all zerks and grease paths in pins to ensure
proper grease flow. Clean and replace as required.
7. Replace all lubricating plugs in all wear pads.
BOOM ASSEMBLY
NOTE: Do not use Loctite on any cable threaded ends.
Always use the locknut and nut provided.
When initially assembling threaded ends of cables, thread
the first spacer on past the flat in the cables so adjustment
can be made later.
1. Assemble the sheaves into the 4
th
section sheave case.
The top sheave is to be installed to the left hand side of
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