National Crane 1-21-2019 Control # 104-07 4-5
1400A SERVICE MANUAL BOOM MAINTENANCE
8. Install the top rear wear pads and cam plates to the top
of the 4
TH
boom section. Install the capscrews through
the holes in outer boom sections.
The wear pads on each side at the top rear of the boom
can be adjusted over a range of 4.8mm (3/16 inch) by
rotating, end for end, the wear pad and plate together or
independently. The holes in these parts are offset from
the center and various combinations of rotation of these
parts allow the adjustment.
9. Uncoil the 4
TH
section retract cable assemblies and
insert the button end into anchors in back of the 4
TH
section. Place uncoiled cable in area that will minimize
the potential for damage.
10. Uncoil the 3
RD
section retract cables and insert the
button end into cable anchor pockets in back of the 3
RD
section. Place the uncoiled cable in an area that will
minimize the potential for damage. Assemble the retract
sheaves and sheave pins in the rear of the 3
RD
section.
Coat the surfaces of the bearings and keeper plates with
grease before assembly.
11. Place the retract cables anchored to 4
TH
section over the
top of the retract sheaves on the 3
RD
section. Install the
keeper capscrew above the sheave to hold the retract
cables in place.
12. Reeve the cables over retract sheave and install the
keeper with wear pad to the bottom rear of the 3
RD
section. This pad acts as a side pad, bottom pad, and
cable retainer. Use Loctite 243 on wear pad hardware.
Loctite all wear pad mounting capscrews.
13. Loop the 3
RD
section extend cable in half and place it on
the top of the 3
RD
section with the loop end towards the
front and the threaded and button end towards the rear
of the section.
14. Install the clamp plate and capscrews with the button
end of the cable installed in the anchor slot on the top
rear of the 3
RD
section.
15. Place the sheave pin and sheave for the 3
RD
section
extend cable in position on the front of the boom. Loop
the cable around the sheave.
16. Slide the 3
RD
and 4
TH
section assembly into the 2
ND
section about 152 cm (5 ft). Be careful not to damage or
cross the retract and upper extend cables attached to
the 4
TH
-3
RD
section assembly.
17. Assemble bottom front wear pads and Teflon plugs for
the 2
ND
section. Attach the pads to the pad plate.
18. Using an appropriate lifting device, lift the 3
RD
and 4
TH
section and install the wear pad and plate in front of the
2
ND
section. Slide sections together within 30 cm (12
inches) of full retraction.
19. Install the cable guide and spacer to the top of the 2
ND
section.
20. Install the front side wear pads with appropriate shims
between 3
RD
and 2
ND
sections. If no boom sections have
been replaced, reinstall shims and wear pads as per
removal tags.
21. Assemble the top rear wear pads and cam plates and
install to the top of the 3
RD
boom section from the back of
the boom. Install the capscrews through the holes in
outer boom sections.
The wear pads on each side at the top rear of the boom
can be adjusted over a range of 4.8mm (3/16 inch) by
rotating, end for end, the wear pad and plate together or
independently. The holes in these parts are offset from
the center and various combinations of rotation of these
parts allow the adjustment.
22. Position the sheave and sheave pin located in the cable
loop on top of 3
RD
section to allow capscrew installation
through top plate of the 2
ND
section. Clamp the sheave
pin and sheave to the bottom of the 2
ND
section top plate
and install the capscrews and torque to specification.
23. Assemble the retract sheaves, pins, and cable keeper
plates in rear of 2
ND
section. Coat the surfaces of the
bearings with grease before assembly.
24. Place retract cables anchored to 3
RD
oven top retract
sheaves attached to rear of 2
ND
. Install keeper capscrew
above sheave to hold retract cables in place.
25. Reeve the cables oven the retract sheave and install the
keeper and wear pad to bottom rear of 2
ND
section. This
pad acts as a side pad, bottom pad, and cable retainer.
26. Assemble the extend cylinder components. Install and
center the sheave pin on the front of the extend cylinder.
Install the bearings into extend cable sheaves. Coat the
surface of the bearings with grease and assemble the
extend sheaves on the sheave pin.
27. Coil about of 304 cm (10 ft) extend cable around the
extend sheaves. Make the coil about 20 cm (8 inches) in
diameter. Install the cable anchors for the extend cable
at the button end finger tight.
28. Install the wear pad over the extend cylinder sheave side
plates. This keeps the end of the extend cylinder
centered in the boom and is the extend cable retainer.
29. Slide the extend cylinder with extend cables into
2
ND
-3
ND
-4
TH
boom assembly enough to assemble the
extend cable anchor into bottom rear of 4
TH
section. Be
careful not to damage the extend cable when inserting
the cylinder into boom sections.
30. Tighten the capscrews clamping extend cable anchor
together. This also locks the anchor in the anchor
cutouts in the 4
TH
section.
Fo
r
Reference
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