JLG 600SC_660SJC Service Manual - Manual (Page 107)

SECTION 4 - BOOM & PLATFORM
3121607 – JLG Lift – 4-5
4.5 WIRE ROPE TENSIONING ADJUSTMENT
Wire Rope Tensioning Procedure
1. Position boom in fully down and retracted position.
Figure 4-10. Dimensions of Boom Sections
DO NOT CLAMP ON THREADS OR THREADS MAY BE DAMAGED.
DO NOT ALLOW WIRE ROPE TO ROTATE OR WIRE ROPE MAY BE DAMAGED.
CLAMP THREADED ENDS OF WIRE ROPE TO PREVENT ROTATION.
Figure 4-11. Clamping Wire Ropes
2. Install adjusting nuts (or remove nylon collar locknuts if
re-adjusting) to both retract and extend wire ropes.
3. Torque retract adjusting nuts (platform end) to 15 ft-lb
(20 Nm) alternating between the two wire ropes and
keeping approximately the same amount of thread
beyond the adjusting nut.
4. Repeat torque procedure in step #4 to extend wire ropes
(turntable end).
5. Extend boom 2 - 3 feet using telescope function. Repeat
step #4.
6. Retract boom 1 - 2 feet using telescope function. Do not
bottom out telescope cylinder. Repeat step #5.
7. Extend boom approximately 2 - 3 feet again and check
torque on retract wire ropes.
8. Retract boom without bottoming out telescope cylin-
der. Check torque on extend wire ropes.
NOTE: Step #8 and #9 may need to be repeated to equalize the
torque on all 4 wire ropes.
9. After all wire ropes are properly torqued, install nylon
collar locknuts. Remove all clamping devices and install
all covers and guards. Check boom for proper function.