BOOM MAINTENANCE SERVICE MANUAL 1400A
4-12 1-21-2019 Control # 104-07
27. Install the cable anchor on the extend cables. Tighten
the capscrews just enough to clamp the two halves of
the anchor so that the cables are prevented from
escaping their positions. This allows easier assembly
into the 4
TH
section anchor point.
28. Position the 4
TH
section extend cables that come off the
top of the sheaves in an area to avoid damage,
preferably on the top of the extend cylinder. This puts
them in their approximate location as the cylinder is
installed into the 3
RD
-4
TH
-5
TH
boom assembly.
29. Slide extend cylinder into the 3
RD
-4
TH
-5
TH
boom
assembly approximately 90cm (36 inches).
• Raise the cylinder up at an angle slightly to allow
easier access to the 4
TH
section extend cable
anchor in the rear of the 4
TH
section.
• Install 4
TH
section extend cable anchor and cable
ends into the anchor point.
• Install the keeper plates over the retract cable ends.
The keepers are shaped to retain the 4
TH
section
anchor as well as the retract cable ends.
• Tighten the capscrews holding the two halves of the
4
TH
section anchor assembly together.
30. Lower extend cylinder to a position parallel with the
3
RD
-4
TH
-5
TH
boom assembly and slowly push the cylinder
into the 3
RD
-4
TH
-5
TH
assembly until the cylinder collar
makes contact with the 3
RD
section rear vertical doubler
plates. Monitor the 4
TH
section extend cable location as
cylinder slides into boom sections to avoid damaging
cables.
31. Raise extend cylinder up to allow cylinder collar to slide
through and align with the anchor pocket on the back of
the 3
RD
section. The lower cylinder collar should move
down into cylinder anchor pocket. Assemble the lock bar
and proper hardware to the cylinder collar to retain the
cylinder into the anchor pocket.
32. Attach the button end of 3
RD
section small extend cables
into anchor point on the rear top plate of the 3rd section.
A thin plate on the bottom and a thicker anchor plate on
the top of the 3rd section are required for proper cable
retention. Assemble with hardware and Loctite 243.
33. Lay the 3
RD
section extend cables on the top of the 3
RD
section with the proper sheaves and attach hardware.
Arrange cables as shown below.
34. The 3
RD
-4
TH
-5
TH
section and cylinder assembly is now
ready to install into the 2
ND
section boom.
35. Slide the 3
RD
-4
TH
-5
TH
section and cylinder assembly into
the 2
ND
section boom about 90 cm (36 inches). Keep the
3
RD
-4
TH
-5
TH
section and cylinder assembly suspended to
avoid damage to the 4
TH
section retract cables.
36. Assemble the bottom wear pads on 2
ND
section pad
plate
• Raise the 3
RD
-4
TH
-5
TH
section and cylinder assembly
high enough in the 2
ND
section to allow the pad plate
with pads to slide between the sections.
• Place the retract cables in the grooves in the bottom
pad plate. As the boom sections slide together, the
retract cables are pulled through the grooves
• Fasten the pad plate to the bottom of the 2
ND
section
with the appropriate hardware.
37. Install a nut on the threaded ends of the 4
TH
section
retract cables. This keeps the cable ends from pulling
through the anchor as the sections are pushed together.
38. Push the 3
RD
-4
TH
-5
TH
section and cylinder assembly
inside the 2
ND
section until it is within 90 cm (36 inches)
of full insertion.
39. Install side wear pads with appropriate shims on front
inside of the 2
ND
section
• Shim according to calibration instructions, or as
pads were originally removed and tagged.
• Install 3
RD
section extend cable sheaves and pins in
the 2
ND
section top plate.
• Assemble the cable keeper/spacer bar plates in 2
ND
section.
Sheave Pin for the
3
RD
Section Extend Cable
3
RD
Section Extend Cable
FIGURE 4-4
Fo
r
Reference
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