JLG G5-18A Service Manual - Manual (Page 41)

3-9 G5-18A, 2505H, 25.5
Boom
3.4.6 Extend/Retract Cylinder Installation
1. Carefully install the extend/retract cylinder into rear
of boom using a suitable sling.
2. Line up barrel end of cylinder with pin bores on 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.
3. Install mounting pin (19), spacers and washers
through frame access hole on chassis and first boom
section bore and cylinder barrel. Secure with
hardware (18) removed earlier.
4. Remove plugs in bottom of extend/retract cylinder
and install previously removed fittings (17).
5. Uncap and connect tubes (16) to previously labeled
fittings at extend/retract cylinder. Apply locking
compound to fittings.
6. Uncap and reconnect tilt hoses and (if equipped)
auxiliary hoses (15) to their appropriate fittings until
wrench-tight. Mark the fitting and torque to
specification. Refer to Section 2.2.3, “Hydraulic
Hose Torque Chart.”
7. Install cover plate (14) and hose clamps at rear of
boom assembly.
8. Reinstall any miscellaneous parts, such as mirror, if
removed previously.
9. Properly connect battery.
10. Start machine and extend the extend/retract cylinder
until rod eye of cylinder aligns with pin bore in
second boom section.
11. Shut the engine OFF.
12. Install mounting pin through side of second boom
section (13) and secure with retaining clips.
13. Start machine and cycle extend/retract cylinder to
bleed any air out of hydraulic system.
14. Check for fluid leaks or any alignment problems.
15. Check the hydraulic fluid level in tank and add fluid
as required.
16. Clean up all debris, hydraulic fluid, etc., in, on, near
and around the machine.
17. Close and secure the engine cover.
18. Remove Do Not Operate Tags from both ignition key
switch and the steering wheel.
19. Install previously removed attachment to quick
attach assembly.
3.5 BOOM WEAR PADS
A total of 14 wear pads are installed on the boom.
Twelve of fourteen wear pads on this boom are flat
rectangular wear pads with metal inserts. Two wear pads
on bottom of second section boom are channeled for tilt
hose and auxiliary hose clearance.
3.5.1 Wear Pad Inspection
Inspect all wear pads for wear. If angle indicators (1) on
end of wear pads are visible, wear pads can be reused. If
the wear pads show uneven wear (front to back), they
should be replaced. Replace wear pads as a set if worn
or damaged.
3.5.2 Wear Pad Installation and Lubrication
Note: Inspect all wear pads. Replace as necessary.
The following wear pad procedure must be followed to
insure proper wear pad installation:
Note: MUST clean wear pad inserts and mounting bolts
of any grease, oil or other contaminates before applying
locking compound and installing mounting bolts.
• Apply locking compound to all the wear pad
mounting bolts.
• Assemble as shown using spacer (2) with holes
before any shim (3 is used.
• If required, a shim (3) must inserted between the
spacer (2) and wear pad support plate, block or
boom section (4).
Ma2070
1 1
MAM1390
2
3
4