JLG G5-18A Service Manual - Manual (Page 36)

Boom
3-4 G5-18A, 2505H, 25.5
10. Lower the boom to a position that allows for the
removal of rod end pin (3) connecting lift/lower
cylinder to boom.
11. Support boom by placing a sling(s) around boom
head. Support lift/lower cylinder and remove lock
bolt (4) and rod end pin (3). Lower lift/lower cylinder
onto frame rails.
12. Properly disconnect battery.
13. Label and disconnect tilt and (if equipped) auxiliary
hydraulic hoses attached to machine at tubes on top
of boom. Plug and cap hose ends to prevent dirt and
debris from entering hydraulic system.
14. Label and disconnect extend/retract hydraulic
hoses at tubes on side of boom. Plug and cap
hose ends to prevent dirt and debris from entering
hydraulic system.
15. If equipped, disconnect the LSI boom proximity
sensor at rear of first boom section.
Note: Tag or identify each hose to the corresponding
fitting it was removed from.
16. Lower boom to a level position and place a suitable
support under rear of boom. Reposition slings to
each end of boom.
17. Remove capscrew (5) and locknut (6) securing boom
pivot pin (7) and remove boom pivot pin.
18. Lift complete boom off machine and set on level
ground or supports being careful not to damage
tubes on bottom of boom.
3.4.2 Complete Boom Installation
Note: Lubrication of boom wear surfaces with grease is
recommended to keep boom wear surfaces lubricated
properly. Lubrication of boom wear surfaces is also
recommended when machine is stored, to help
prevent rusting. Refer to Section 2.4, “Fluids, Lubricants
and Capacities.”
1. Park machine on a hard, level surface.
2. Place transmission control lever in (N) NEUTRAL.
3. Engage park brake and shut engine OFF.
4. Place a Do Not Operate Tag on both ignition key
switch and steering wheel.
5. Allow system fluids to cool.
Note: Grease the boom pivot bore, compensating
cylinder rod ends, lift/lower cylinder rod end and pins
before installing.
6. Balance boom assembly using suitable slings and
carefully guide the boom into position for attachment
to frame.
7. Align frame pivot bore with the boom assembly pivot
bore. Install boom pivot pin (7)
8. Install capscrew (5). Apply locking compound and
torque locknut (6) to 66 lb-ft (90 Nm).
9. With sling still in place, install rod end of the lift/lower
cylinder, pin (3) and lock bolt (4). Apply locking
compound and torque to 66 lb-ft (90 Nm).
Note: Raising boom up or down with sling may be
necessary so boom, compensating and lift/lower cylinder
bores can be aligned for easier pin installation.
MY8580
3
4
MY8590
7
5
6