JLG G6-23A Service Manual - Manual (Page 28)

Boom
3.6 G5-19A, G6-23A
Install boom pivot pin (1) and lock bolt. Apply
Loctite
® #242 and torque to 66 lb-ft (90 Nm).
6. With the sling still in place, install the compensating
cylinder, pin (2) and lock bolt. Apply Loctite ® #242
and torque to 66 lb-ft (90 Nm).
7. With the sling still in place, install the rod end of the
lift/lower cylinder, pin and lock bolt. Apply Loctite ®
#242 and torque to 66 lb-ft (90 Nm).
Note: Raising the boom up or down with the sling may
be necessary so the boom, compensating and lift/lower
cylinder bores can be aligned for easier pin installation.
8. Uncap and reconnect the extend/retract cylinder
fittings and plugs from extend/retract cylinder hoses.
Attach each hose to the extend/retract cylinder
fittings and tighten until wrench-tight. Mark the fitting,
then tighten each hose firmly 1 to 1,5 flats.
9. Uncap and reconnect both the tilt and auxiliary
hoses. Attach both sets to their appropriate tubes
until wrench-tight. Mark the fitting, then tighten each
hose firmly 1 to 1,5 flats.
10. Start the engine and operate all boom functions
several times to bleed any air out of the hydraulic
system. Check for fluid leaks. Check the hydraulic
fluid level in the tank and add fluid as required.
11. Clean up all debris, hydraulic fluid, etc., in, on, near
and around the machine.
12. Close and secure the engine cover.
3.4 BOOM WEAR PADS
The wear pads on this machine are flat rectangular wear
pads with metal inserts.
On the G5-19A and G6-23A a total of 16 wear pads are
installed on the outer boom.
3.4.1 Wear Pad Inspection
Inspect all wear pads (3) for wear. If the angle
indicators (4) on the ends of the wear pads are visible, the
wear pads can be reused. If the pads show uneven wear
(front to back), they should be replaced. Replace pads as
a set if worn or damaged.
3.4.2 Boom Wear Pad Replacement
When replacing a wear pad on the boom, replace both
wear pads on that side of the boom; e.g.: replace top front
left and top front right wear pads at the same time.
Usually, shimming will remain the same when installing
new wear pads. All wear pads are secured to the boom
using different capscrews and washers. When installing
new wear pads, apply Loctite
® #242 to all wear pad
mounting capscrews M10 and torque to 36 lb-ft (50 Nm).
Rear upper pads on G6-23A, apply Loctite
® #242 to all
wear pad mounting capscrews M10 and torque to 66 lb-ft
(90 Nm). Grease the new pads and surrounding area.
The boom wear pads (5) are mounted on the inside of the
first boom section and the outside of the second boom
section.
MAH0140
2
1
MA2070
4
3
4