National Crane 600H, Руководство по обслуживанию

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BOOM 600H SERVICE MANUAL
4-12
08-19-2022 Control # 092-13
Boom Disassembly Alternative #1
1. Gaining access through rear of boom, loosen capscrews
retaining the keeper plates holding the extend cable
anchor and retract cables in the rear of the 3
rd
section,
remove keeper plates. Loosen capscrew on the anti-
two-block wire clamp on the anchor assembly.
2. Extend boom 24 in (60 cm). Loosen and remove the
nuts which secure the extend cables to the cable anchor
plate. Remove nut from anti- two-block spade bolt. Tag
and disconnect hydraulic lines to the extend cylinder.
3. Drape extend cables and anti-two-block cable in side
boom, and slide cable anchor plate out of the side of the
hoist mount if hoist has been removed from boom.
4. Loosen and remove two capscrews, lockwashers and
spacers which anchor the extend cylinder rod butt plate
to the rear of the 1
st
section.
5. Loosen and remove two capscrews and lockwashers
securing spacer bar to the inside top of the front of the
1
st
section. Remove spacer bar.
6. Loosen and remove four capscrews securing wear pads
to the bottom of the 1
st
section. Removal of side wear
pads is optional. Adequate clearance exists between
adjoining section side pads for boom disassembly. If
side pad removal is required, tag all pads, shims, and
corresponding locations for proper reassembly.
7. Support 2
nd
-3
rd
-4
th
assembly at the front with an
appropriate lifting method. Raise the 2
nd
- 3
rd
-4
th
assembly inside the 1
st
section to allow for front bottom
pad removal. Remove bottom wear pads.
8. With the 2
nd
-3
rd
-4
th
assembly supported, slide assembly
out of the 1
st
. Relocation of the sling point on the 2
nd
-3
rd
-
4
th
assembly will be necessary for proper balancing of
the assembly as it slides out of the 1
st
section. Keep
tension on retract cables as the assembly is pulled out of
the 1
st
to minimize the chance of retract cable damage.
9. Place 2
nd
-3
rd
-4
th
assembly on a suitable horizontal
surface. Take care not to pinch or crush retract cables
while lifting or supporting assembly.
10. Remove top rear wear pads on the 2
nd
section. They will
lift off the cam plates easily. Do not remove or loosen the
capscrews holding the cam plates to the section. This
will affect side clearance during re-assembly.
11. Loosen and remove four capscrews securing the rear
bottom wear pads on the 2
nd
section. This pad serves as
a bottom and side pad as well as the retract cable
keeper under the retract sheaves. Removal of this pad
will allow the retract cables to uncoil off the retract
sheaves. Place retract cable ends in a location to
minimize the possibility of damage.
12. Loosen and remove six capscrews securing retract
sheave pin and retract sheaves to 2
nd
section. Remove
sheaves and pins.
13. Loosen and remove two capscrews functioning as upper
retract cable keepers. Remove retract cables.
14. Loosen and remove two capscrews securing lock bar to
the extend cylinder collar. This bar constrains the
vertical movement of the extend cylinder. Remove bar.
15. Loosen capscrews retaining extend cable anchor to
back of the 4
th
section. Total removal of the capscrews
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 and anti- two-block wire
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 4
th
section and loosen and
remove the anti-two-block cable clamp on the extend
cable anchor. 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 will permit easier removal through the 2
nd
and 3
rd
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. Anti-two-block wire can be removed if necessary by
disassembly of the clamp arrangement at the sheave
case and pulling wire through boom.
20. Loosen and remove two capscrews, cable guide, wear
pad and spacer bar from the front top of the second
section.
21. Loosen and remove four capscrews attaching the
bottom pad plate to the second section. Slightly lift third
section, and remove pad plate.
22. Slide 3
rd
section out of 2
nd
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.
23. Loosen and remove all remaining capscrews and wear
pads from boom sections.
REFERENCE ONLY