JLG 660SJ Service Manual - Manual (Page 173)

SECTION 4 - BOOM & PLATFORM
3121202 – JLG Lift – 4-1
SECTION 4. BOOM & PLATFORM
4.1 BOOM ROPE TORQUING PROCEDURES
1. Position boom in fully down and fully retracted posi-
tion.
2. Clamp both threaded ends of wire rope to prevent
rotation.
NOTE: Do not clamp on threads.
3. Install adjusting nuts (or remove nylon collar lock-
nuts if re-adjusting) to both retract and extend wire
ropes.
4. Torque retract adjusting nuts (platform end) to 15 ft.
lbs. (20 Nm) alternating between the two wire ropes
and keeping approximately the same amount of
thread beyond the adjusting nut.
NOTE: Do not allow wire rope to rotate. This may damage
the wire rope.
5. Repeat the torque procedure in step #4 to the
extend wire ropes (turntable end).
6. Extend the boom 2 - 3 feet using the telescope func-
tion. Repeat step #4.
7. Retract the boom 1 - 2 feet using the telescope func-
tion. Do not bottom out telescope cylinder. Repeat
step #5.
8. Extend the boom approximately 2 - 3 feet again and
check torque on the retract wire ropes.
9. Retract the boom without bottoming out telescope
cylinder and check torque on the extend wire ropes.
NOTE: Step #8 and #9 may need to be repeated to equalize
the torque on all 4 wire ropes.
10. After all wire ropes have been properly torqued,
install nylon collar locknuts. Remove all clamping
devices and install all covers and guards. Check the
boom for proper function.
Figure 4-1. Dimensions of Boom Sections
Figure 4-2. Clamping Wire Ropes