National Crane Published 10-30-2014 Control # 040-09 5-21
1400H OPERATOR AND SERVICE MANUAL SERVICE
will allow the cable anchor to be completely
disassembled, backing capscrews out approximately
0.50 in (12 mm) will allow the anchor assembly to slide
rearward out of the section as the extend cylinder is
removed.
16. Support extend cylinder with an appropriate lifting
device and pull the extend cylinder out of the boom while
keeping the extend cables tensioned slightly by hand to
minimize the possibility of damage to the cables. Pull
cylinder to within 3 ft (91 cm) of complete removal from
the boom sections.
17. Reach into the rear of the 4th section and pull the extend
cable anchor out from its retaining pocket on the bottom
of the 4th section. A slight angle applied to the anchor as
it's being pulled to the rear will permit easier removal
through the 2nd and 3rd sections.
18. Remove the extend cylinder from the boom. Do not
allow the sheaves to fall off the pin on the end of the
extend cylinder. Remove extend cables. Place cylinder
and cables in suitable area to prevent possible damage.
19. Loosen and remove two capscrews, cable guide, wear
pad and spacer bar from the front top of the second
section.
20. Loosen and remove four capscrews attaching the
bottom pad plate to the second section. Slightly lift third
section, and remove pad plate.
21. Slide 3rd section out of 2nd section. Removal of side
pads is optional, as the side pads have adequate
clearance for boom disassembly. If removal of side pads
is required, tag all shims, pads and corresponding
locations for proper re-assembly.
22. Loosen and remove two capscrews, cable guide wear
pad and spacer bar from the front top of the third section.
23. Loosen and remove four capscrews attaching the
bottom pad plate to the third section. Slightly lift fourth
section, and remove pad plate.
24. Slide fourth section out of second section. Removal of
side pads is optional, as the side pads have adequate
clearance for the boom disassembly. If removal of the
side pads is required. Tag all shims, pads and
corresponding locations for proper reassembly.
25. Loosen and remove all remaining capscrews and wear
pads from sections.
Additional Maintenance, Disassembled
Boom
1. Clean all boom sections and inspect for wear, dents,
bent or crooked boom 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 installed bearing diameter is 0.015
in (0,38 mm) larger than pin diameter, bearing must be
replaced. Any cut or gouge which causes the bearing
liner to lose strands is cause for bearing replacement.
4. Clean and inspect all cable assemblies according to wire
rope inspection procedures in this section. Pay
particular attention to any wire breakage at the end
connections. Replace cable assemblies as required.
Lubricate all cable assemblies as required. Lubricate all
cable assemblies before reinstalling them 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.
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