National Crane Published 10-30-2014 Control # 040-09 5-31
1400H OPERATOR AND SERVICE MANUAL SERVICE
(30 cm). Suspend the 4th section off of the lower wear
pads.
20. Remove 4 capscrews which retain the lower front pad
plate to the 3rd section. Remove pad plate. Remove and
tag four side wear pads with shims from the front of the
3rd section. Pull the retract cables out and keep retract
cables taunt while pulling the 4th-5th assembly out of the
3rd section. Support the base end of the 4th as it exits
the 3rd section boom.
21. Place 4th-5th assembly on a suitable horizontal surface.
Take care not to damage the retract cables while lifting
or supporting the 4/5 assembly.
22. Remove lower L-pads, retract cables, and retract cable
keeper from rear of 4th section, coil 5/4/3 retract cables
inside of 5th section. Remove upper top wear pads and
cam plates from upper rear of 5th section.
23. Remove cable guide and upper spacer bar from the front
of the 4th section. Remove side wear/ cable retainer
pads from front of 4th section, leave 3/4/5 extend
sheaves and 3/4/5 extend cables in place.
24. Attach sling or chain to the front of the 5th section boom
and pull the 5th section out of the 4th until there is
approx. 36 in (90 cm) of the 5th still inserted in the 4th,
use caution to keep 3/4/5 extend cables from damage as
boom sections slide apart, if possible keep tension on 3/
4/ 5 extend cables from the base end of the 4th boom
section during this procedure.
25. Lift 5th section off the lower pads and remove pads and
hardware. Remove 3/4/5 extend sheaves and hardware.
26. Slide 5th section completely out of 4th. Support the base
end of the 5th as it exits the 4th section boom. Place 5th
section boom on a suitable horizontal surface.
27. Remove cable retainers and hardware from side anchor
locations on the 5th section. Remove 3/ 4/5 extend and
5/4/3 retract cables from anchor points in the side of the
5th section, place in suitable area to avoid damage.
28. Remove loadline sheaves by removing retainers and
lightly tapping on sheave pin while removing sheaves
and spacers until all sheaves are removed from boom
sheave case.
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.
To Next Page
Loading...
