JLG 660SJ ANSI Service Manual - Manual (Page 177)

SECTION 5 - HYDRAULICS
3120718 – JLG Lift – 5-11
3. Tag and disconnect hydraulic lines to telescope cyl-
inder. Use suitable container to retain any residual
hydraulic fluid. Cap hydraulic lines and ports.
4. Remove the retaining rings that retain the telescope
cylinder rod to the fly boom.
5. Using a suitable brass drift, carefully drive telescope
cylinder rod pin #1 from the fly boom.
6. Remove mounting hardware securing the telescope
cylinder barrel end to the base boom.
7. Attach a suitable sling to the telescope cylinder.
Using a suitable lifting device attached to the sling,
carefully pull the cylinder partially from the aft end
boom assembly.
8. Secure the cylinder with a suitable sling and lifting
device at the approximate center of gravity.
9. Carefully lift the cylinder clear of the boom assembly
and lower to the ground or suitably supported work
area.
Main Boom Telescope Cylinder Installation
1. Attach a hydraulic power supply to the telescope
cylinder ports. Using suitable supports or lifting
devices at each end of the cylinder, extend the rod
so that the cylinder pin attach holes are the same
distance apart as the boom pin attach holes.
2. Using suitable lifting equipment, carefully lower the
cylinder to the boom assembly.
3. Install the cylinder into the boom assembly.
4. Remove the lifting devices from the telescope cylin-
der.
5. Carefully install telescope cylinder rod pin #1
through the fly boom and secure it with the retaining
rings.
6. Carefully install the telescope cylinder barrel end
support into slots in base boom and secure with
blocks and bolts. Use Loctite #242 on bolts. Shim
as necessary.
7. Remove applicable hydraulic line and port caps and
correctly connect the hydraulic lines to the tele-
scope cylinder. Ensure all hoses are correctly
routed.
8. Remove boom prop and overhead crane. Activate
hydraulic system.
9. Using all applicable safety precautions, operate the
boom functions. Check for correct operation and
hydraulic leaks. Secure as necessary.
10. Check fluid level of hydraulic tank and adjust as nec-
essary.
Figure 5-15. Location of Components - Telescope and Lift Cylinder