National Crane Published 10-30-2014 Control # 040-09 5-23
1400H OPERATOR AND SERVICE MANUAL SERVICE
in (0,8mm) off center in the wear pad. Various
combinations of rotation of these parts allow the
adjustment.plates function as rear side clearance
adjustment.
22. Position sheave and sheave pin located in cable loop on
top of 3rd to allow capscrew installation, through top
plate of 2nd. Install capscrews and torque to
specification, clamping sheave pin and sheave to the
bottom of the 2nd section top plate.
23. Assemble retract sheaves, retract sheave pins and
cable keeper plates in rear of 2nd section. Coat surfaces
of bearings with grease before assembly.
24. Place retract cables anchored to 3rd over top of retract
sheaves attached to rear of 2nd. Install keeper capscrew
above sheave to hold retract cables in place.
25. Reeve cables over retract sheave and install keeper/
wear pad to bottom rear of 2nd section. This pad acts as
a side pad, bottom pad, and a cable retainer.
26. Assemble exterior extend cylinder components. Install
and center sheave pin sheave case end of extend
cylinder. Install bearings into extend cable sheaves.
Coat surface of bearings with grease and assemble
extend sheaves on sheave pin.
27. Wrap approximately 10 ft (300 cm) of each 7/8 in (22.22
mm) diameter 2/3/4 extend cable around extend
sheaves and install 4th section extend cable anchor
around cables at button end. Do not tighten capscrews
clamping anchor together completely. These capscrews
if tightened completely will not allow cable anchor to
install into 4th section.
28. Install wear pad over extend cylinder sheave side plates.
This serves as a wear pad to keep the end of the extend
cylinder centered in the boom, as well as an extend
cable retainer.
29. Slide extend cylinder/extend cables into 2nd-3rd-4th
boom assembly enough to assemble extend cable
anchor into bottom rear of 4th section. Be aware of
extend cable location when inserting cylinder into boom
sections, inadvertent crushing or other damage to
cables will warrant replacement.
30. Tighten capscrews clamping extend cable anchor
together. This will also lock anchor in place in the anchor
cutouts in the 4th section.
31. Visually verify that the extend cables are properly routed
on their sheaves and continue to slide with the extend
cylinder and cables into the boom sections. Keep extend
cables supported and slightly tensioned during insertion
of cylinder to maintain proper cable placement.
32. As the extend cylinder nears complete insertion into the
2nd-3rd-4th section assembly, adjust the height of the
cylinder to allow the cylinder anchor collars to access
the cylinder keeper cutouts in the doubler plates on the
sides of the 2nd and 3rd sections.
33. Drop the cylinder down into the vertical cutouts in the
doubler plates on the sides of the 2nd and 3rd sections.
Cylinder length or boom section placement may have to
be adjusted to allow cylinder collars to drop into their
proper position.
34. Install lock bar and capscrews to the extend cylinder
collar in the 3rd section.
35. Install large extend cable anchor into anchor cutouts in
the doubler plates in the rear of the 2nd by routing the 7/
8 in (22,22 mm) extend cables through the anchor and
the small 7/16 in (11,11 mm) cable over the anchor. Slide
anchor fully into cutout.
36. Install keeper plates and hardware. This keeper plate
retains both the horizontal movement of the extend
anchor and the vertical movement of the extend cylinder.
37. Install 2nd-3rd-4th section boom assembly into 1st
section boom, use caution when sliding sections
together, 3rd retract cables must maintain their position
to prevent damage, do not let boom rest on cables.
Damage will result.
38. Assemble bottom front wear pads for 1st section and
Teflon plugs.
39. Using appropriate lifting device, lift 2nd-3rd-4th section
assembly to allow for wear pad installation in front of 1st.
Install wear pads. Slide sections together within 12 in (30
cm) of full retraction.
40. Install upper spacer to front of 1st section.
41. Install front side wear pads with appropriate shims
between 2nd and 1st sections. If boom has been
disassembled, and no sections have been replaced, use
same shim quantity and location as was previously
used. If locations are in question, refer to shim
calibration section in this book.
42. Push boom together until extend cylinder butt plate
makes contact with the rear cylinder anchor plates in the
rear of the 1st section. Install spacers, washers and
capscrews, attaching cylinder to 1st section boom. If
cylinder is misaligned with anchor points, cylinder butt
plate can be rotated to achieve proper alignment
(holding valve up, parallel with boom top plate).
43. Assemble top rear wear pads to the top of the 2nd boom
section with the cam plates and install through the hoist
mount end of the boom. Install capscrew through 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 3/16
in (4,8 mm) by
rot
ating, end for end, the wear pad and plate or the wear
pads and plate independently. This is possible because
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