SERVICE 1400H OPERATOR AND SERVICE MANUAL
5-28 Published 10-30-2014 Control # 040-09
FIVE SECTION CABLE TENSIONING
After boom reassembly or from time to time if interior
proportioning cables appear loose, cable tensioning may be
required. Tensioning must be done with the boom horizontal.
Proceed as follows:
1. Cycle boom approximately 8 ft (243 cm) out and in a few
times [2 ft (60 cm) per section].
2. Fully retract boom. At full retraction the base of the 2nd
section boom bottoms out in the base of the 1st section
boom, the base of the 3st section boom bottoms out in
the base of the 2nd section, the base of the 4th section
boom bottoms out in the base of the 3st section boom
and the base of the 5th section boom bottoms out in the
base of the 4th section boom. Marks should be scribed
on the side plates along the front edge of each upper
wear pad indicating where each section bottoms out.
This will aid the mechanic during the cable tensioning
procedure. When the cables are torqued (tensioned)
properly, the boom sections should extend/retract
proportionally and bottom out at the same time during
retract.
3. Tighten the 5/4/3 retract, 3/4/5 extend, 4/3/2 retract, 2/3/
4 extend, 3/2/1 retract and 1/2/3 extend cables (in order
listed) to remove slack from the cables and to achieve
proper sequencing of bottoming out base of booms. To
reach the 3/4/ 5 extend cables boom must be extended
out approximately 18 in (45 cm), 4.50 in (11,43 cm) per
stage and tightened through openings in the 1st and 2nd
section booms.)
4. Torque the 5/4/3 retract cables to 6 lb-ft (8,13 Nm) each.
Use the flats at the front of the cable ends to keep the
cables from rotating while torquing. These cables are
located at the bottom tip of the 3st section boom.
5. Torque the 3/4/5 extend cables to 15 lb-ft (20,37 Nm)
each. These cables are located at the top base of the 3st
stage boom. (Reference Step #3 for access to the 3/4/5
extend cables.)
6. Torque the 4/3/2 retract cables to 7 lb-ft (9,5 Nm). Use
the flats at the front of the cable ends to keep the cables
from rotating while torquing. These cables are located at
the bottom tip of the 2nd section boom.
7. Torque the 2/3/4 extend cables to 20 lb-ft (27 Nm) each.
These cables are located at the top base of the 2nd
section boom. (Reference step #3 for access to the 2/3/4
extend cables.)
8. Torque the 3/2/1 retract cables to 9 lb-ft (12 Nm). Use
the flats at the front of the cable ends to keep the cables
from rotating while torquing. These cables are located at
the bottom tip of the 1st section boom.
9. Torque the 1/2/3 extend cables to 7 lb-ft (9,5 Nm) each.
These cables are located at the top of the 1st section
boom hoist bar.
10. Check to ensure that boom sections are all bottoming
out simultaneously as in Step 2. If not, proceed as
follows:
a. If the second section is bottoming out first, equally
loosen the 1/2/3 extend cables and tighten the 3/2/1
retract cables. This will cause the second section
boom to bottom later but will also cause the third,
fourth and fifth sections to bottom out sooner.
b. If the third section is bottoming out first, equally
loosen the 3/2/1 retract cables and tighten the 1/2/3
extend cables. This will cause the third, fourth and
fifth sections to bottom later and the second section
boom to bottom sooner.
c. If the fourth section is bottoming out first, equally
loosen the 4/3/2 retract cables and tighten the 2/3/4
extend cables. This will cause the fourth and fifth
sections to bottom out later and the second and
third sections to bottom out sooner.
1/2/3 EXTEND CABLES
3/4/5 EXTEND CABLES
2/3/4 EXTEND CABLES
SCRIBE MARKS WHERE BOOM
SECTIONS BOTTOM OUT
5TH SECTION
5/4/3 RETRACT CABLES
4/3/2 RETRACT CABLES
3/2/1 RETRACT CABLES
4TH SECTION
3RD SECTION
2ND SECTION
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