JLG G12-55A Service Manual - Manual (Page 49)

3-15 G10-55A, G12-55A
Boom
9. Install the wear pad support plate (27) with existing
hardware at the inside front of the second boom
section.
10. Install the previously removed wear pads, spacers
and shims at the bottom front of the second boom
section (28 & 29). Snug mounting bolts.
Note: Longer bolts (30) may be required to fully engage
the threaded inserts in the wear pads without allowing
bolts to protrude past the chamfer on the wear pads.
Refer to Section 3.11.2, “Wear Pad Installation and
Lubrication.”
11. Manually retract the boom sections as required to
connect the retract chains.
12. Install the bracket and clevis assembly (31) at the
rear of the fourth boom section. Torque mounting
bolts.
3.5.11 Second, Third and Fourth Boom
Section Installation
Note: Using a straight bar approximately 40 in
(1041 mm) long will aid in the installation of the wear
pads located on the inside front of each boom section.
1. Place the sling or using two slings for better stability,
around the second boom section and slowly insert
the second, third and fourth boom sections into the
first boom section being careful not to damage any
surrounding components and allowing sufficient
room to install the wear pads at the front of the first
boom section.
2. Install the previously removed wear pads, spacers
and shims at the bottom front of the first boom
section (1). Snug mounting bolts. Shim as needed
AFTER boom section is installed to maintain a
0.070 - 0.130 in (1,78 - 3,30 mm) gap between the
boom sections.
3. Install the previously removed wear pads, spacers
and shims on each side at the front of the first boom
section (2). Snug mounting bolts. Shim as needed
AFTER boom section is installed to maintain a
0.070 - 0.130 in (1,78 - 3,30 mm) gap between the
boom sections.
4. Install the previously removed wear pads, spacers
and shims at the top front of the first boom section
(3). Snug mounting bolts. Shim as needed AFTER
boom section is installed to maintain a
0.070 - 0.130 in (1,78 - 3,30 mm) gap between the
boom sections.
5. Re-adjust the sling(s) and push the second, third
and fourth boom assembly the remainder of the way
into the first boom section.
MY3590
31
MY4140
3
2
2
1
3
2
2
1