JLG G5-18A Service Manual - Manual (Page 29)

3.9 G5-18A/2505
Boom
10. Loosen and remove both fittings from the bottom of
the extend/retract cylinder barrel. Plug the openings
in the extend/retract cylinder barrel.
11. Loosen and remove the locking bolt on the cylinder
barrel mounting pin.
12. Remove the cylinder barrel pin (5). Note the location
of the spacers and washers.
13. Attach a sling or other suitable lifting device to the
extend/retract cylinder and carefully pull the extend/
retract cylinder free of the machine through the rear
of the boom/chassis assembly.
Note: The tilt hoses and if equipped, the auxiliary hoses
may need to be moved during removal of the extend/
retract cylinder.
14. Place the extend/retract cylinder in a designated
area for the next operation.
3.3.10 Extend/Retract Cylinder Installation
1. Carefully install the extend/retract cylinder into the
rear of the boom and line up the barrel end of the
cylinder with the pin bores on the first boom section.
Note: The tilt hoses and if equipped, the auxiliary hoses
may need to be moved during installation of the extend/
retract cylinder.
2. Install the mounting pin (5), spacers and washers
through the frame access hole on the chassis and
the first boom section bore and cylinder barrel.
Secure with retaining clips.
3. Remove the plugs in the bottom of the extend/retract
cylinder and install the previously removed fittings.
4. Uncap and connect the tubes to the previously
labeled fittings at the extend/retract cylinder. Apply
Loctite 545
® to the fittings.
5. Uncap and reconnect the tilt hoses and (if equipped)
auxiliary hoses (4). Attach both sets to their
appropriate fittings until wrench-tight. Mark the
fitting, then tighten each hose firmly 1 to 1,5 flats.
6. Install the cover plate and hose clamps (3) at the
rear of the boom assembly.
7. Install the battery negative (-) cable to the battery
negative (-) terminal.
8. Start the machine and extend the extend/retract
cylinder until the rod eye of the cylinder aligns with
the pin bore in the second boom section.
9. Shut the engine OFF.
10. Install the mounting pin through the side of the
second boom section (2) and secure with the
retaining clips.
11. Start the machine and cycle the extend/retract
cylinder checking for leaks or any alignment
problems.
MY2670
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