JLG X20JP - X600AJ Service Manual - Manual (Page 166)

SECTION 4 - BOOM & PLATFORM
3121623 – JLG Lift – 4-13
Three month inspection
1. Remove all protection sumps from the third arm and
the two extensions. Use a flashlight torch to visually
check the state of the ropes and the extension pul-
leys.
2. Check the correct rope tension, trying to bend them
manually. If they are pulled correctly they should not
be able to move more than a few millimeters.
3. Check that in the extension arms exit phase the
return ropes are sufficiently in traction in a way not to
allow relative contact with the third arm.
4. Vice versa in the extension return phase, check that
the outlet ropes are subject to a tension that allows
them not to come into contact with the second
extension or the cylinder.
5. Use a torque wrench to check the correct torque of
al rope fixing nuts and the respective rocker arms;
recommended torque 10 Nm.
If the tension of the ropes should not be adequate the
conditions for use must be restored by scrupulously fol-
lowing the Ropes Tension Adjustment procedure reported
below.
4.4 WIRE ROPE TENSION ADJUSTMENT
PROCEDURE
NOTE: Do not clamp on threads.
Figure 4-19. Clamping Wire Ropes
1. Loosen the register counter-nuts by a few turns,
position them in a way to access the adjustment
nuts in order to make the adjustment. (2 nuts with
relative counter-nut for extend ropes and one nut
with relative counter-nut for retract ropes rocker
arm).
2. Completely retract both extendible arms and make
them escape for about 30-40cm.
3. Tighten the nut for the traction of the fixing rocker
arm of the return ropes to a torque of 10Nm.
Figure 4-20. Return ropes fixing rocker arm
4. Completely extend the extensions and retract them
by about 30-40cm.