Terex Genie S-80 J, Service And Repair Manual

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Service and Repair Manual June 2021
Boom Components
46 S ® -80 J, S ® -80 J TraX ™ Part No. 1285307GT
4-7
Boom Extend and Retract Cables
How to Adjust the Boom
Extend/Retract Cables
The boom extend/retract cables and sheaves are
responsible for the extension and retraction of the
boom tubes. Inspecting for foreign objects,
damage and/or improper adjustment of the boom
extend/retract cables and related components on a
regular basis is essential to good machine
performance and safe machine operation. The
boom extend and retract functions should operate
smoothly and be free of hesitation, jerking and
unusual noise.
Note: Perform this procedure with the machine on
a firm, level surface with the boom raised to the
horizontal position.
1 Fully retract the boom.
2 Remove the boom end cover from the pivot
end of the boom.
Component damage hazard. The
cable from the string
potentiometer can become
damaged if it is kinked or pinched.
3 Inspect the threaded ends of the boom extend
cables. The threads must be clean and in
good condition with no damaged threads.
4 Adjust the extend cable adjustment nuts until
approximately 1.5 inches / 4 cm of threads
are visible past the nylock nut.
Note: If the cables have been replaced, be sure
the adjustment nuts have been replaced. Do not
re-use the existing nuts.
5 Extend the boom until there is approximately
3 feet / 1 m of travel left. Do not fully extend
the boom.
6 Locate the retract cable adjustment nut on the
bottom of the number 1 boom tube at the
platform end of the boom.
7 Using a dial type torque wrench, torque the
retract cable adjustment nut to 32-36 ft lbs /
43-49 Nm using gentle and steady torque.
8 Retract and extend the boom approximately
3 feet / 1 m two times and stop during the
extension cycle. This will create slack in the
retract cables.
Note: Do not fully extend the boom. Stop when
there is approximately 3 feet / 1 m of travel left.
9 Repeat steps 7 and 8 two to three times.
10 Fully extend the boom then retract the boom
approximately 12 inches / 30 cm.
11 At the pivot end of the boom, visually inspect
the boom extend cables for even cable droop
or sag.
Note: If the boom extend cables are uneven,
tighten the boom extend cable adjustment nut at
the pivot end of the boom for the appropriate
cable.