JLG 1100SB Service Manual - Manual (Page 215)

SECTION 4 - BOOM & PLATFORM
3121265 – JLG Lift – 4-45
Wire Rope Tensioning Procedure
With the boom assembly in the fully retracted position and
before making any adjustments to the wire ropes of the
boom assembly, remove any covers necessary to visually
inspect the threaded fittings, taking note of the amount of
adjustment that is left for both the extend and retract wire
ropes for the fly and outer mid booms. Also, take note of
the position of each boom section while the assembly is in
the fully retracted position. Take preliminary measure-
ments and compare them to Figure 4-28., Wire Rope Ten-
sioning Figure A.
NOTE: The inner mid section is positioned by the hydraulic
cylinder. No adjustments will be made to this section.
The wire ropes within the assembly control the
movement of the outer mid and fly boom sections.
If it is necessary to reposition the outer mid and fly boom
sections to achieve the measurements in Figure 4-28.,
Wire Rope Tensioning Figure A, sound technician judg-
ment should be used to compare the thread adjustment
(that is left on the wire rope fittings) to the position of the
boom sections. The sections can be repositioned slightly
to achieve a more even adjustment at the wire rope fittings
when comparing the extend and retract systems.
1. Remove the lock plates and nylon collar locknuts
from the wire rope fittings.
2. Extend the boom 5 to 6 feet (1.5 to 1.8 m) from fully
retracted position while maintaining a horizontal (+/-
5°) position of boom.
3. Using tool P/N 4120043, torque outer mid retract
adjuster nuts to 80 ft.lb. (112 Nm), alternating
between the two ropes until both maintain the
required torque.
4. Using tool P/N 4120043, torque fly retract adjuster
nuts to 80 ft.lb. (112 Nm), alternating between the
two ropes until both maintain the required torque.
5. Retract boom 2 to 3 feet (0.6 to 0.9 m) from exten-
sion point reached in Step #2.