JLG 660SJ ANSI Service Manual - Manual (Page 181)

SECTION 5 - HYDRAULICS
3120718 – JLG Lift – 5-15
5. Tag, disconnect and cap the tower lift cylinder
hydraulic lines and ports.
6. Remove mounting hardware securing the cylinder
barrel pin to the turntable. Using a suitable brass
drift, drive out the cylinder barrel pin.
7. Carefully remove restraining slings and remove
tower lift cylinder from turntable. Place in a suitable
work area.
8. If necessary, use an auxiliary power source and fully
retract lift cylinder.
Tower Lift Cylinder Installation
1. With the main boom and tower boom positioned
and supported as in Figure 5-18., Boom Positioning
and Support, Cylinder Repair (A Models), place the
tower lift cylinder in position on the turntable and
secure in place using slings.
2. Align holes in turntable and lift cylinder. Using a suit-
able rubber mallet, install the cylinder barrel pin and
secure with mounting hardware.
3. Connect an auxiliary power source to the cylinder
and extend cylinder rod until the cylinder rod bush-
ing aligns with bushings on boom.
4. Using an appropriate brass drift, drive the rod attach
pin through the aligned bushings. Secure pin with
attaching hardware.
Figure 5-19. Tower Telescope Cylinder Removal