JLG 600A_AJ Service Manual - Manual (Page 221)

SECTION 5 - HYDRAULICS
3121201 – JLG Lift – 5-11
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.
Main Boom Lift Cylinder Removal
1. Place the machine on a flat and level surface. Start
the engine and place the main boom in the horizon-
tal position. Shut down engine and prop the boom.
(See Figure 5-17., Boom Positioning and Support,
Cylinder Repair.
2. Remove the hardware retaining the cylinder rod
attach pin #2 to the boom. Using a suitable brass
drift, drive out the cylinder rod attach pin.
3. Using auxiliary power, retract the lift cylinder rod
completely.
4. Disconnect, cap and tag the main boom lift cylinder
hydraulic lines and ports.
5. Remove barrel end attach pin #3 retaining hard-
ware. Using a suitable brass drift drive out the barrel
end attach pin from the upright.
6. Remove the cylinder from the boom and place in a
suitable work area.
Figure 5-14. Location of Components - Telescope and Lift Cylinder