JLG G12-55A Service Manual - Manual (Page 44)

Boom
3-10 G10-55A, G12-55A
3.5.4 Hose Carrier Removal
1. Remove the guide bracket (11) at the front of the
hose carrier (12). Reuse the existing hardware.
2. Loosen and remove the front two mounting bolts (13)
holding the hose carrier in place. Tag all hardware.
3. Remove the hose carrier through the front of the
fourth boom section.
4. When the hose carrier is approximately 25% free of
the fourth boom section, fasten the two hose carriers
together (using nylon tie-wraps or nylon straps) to
prevent separation.
5. Continue to remove the hose carrier, fastening the
hose carriers together as they are being removed.
6. When the hose carrier is approximately 75% tied
together, pull the assembly free of the boom section.
7. Lower the hose carrier onto a suitable support.
8. Remove the hose carrier guide bracket from the
inside of the fourth boom section (14).
3.5.5 Fourth Boom Section Assembly
1. Place the fourth boom section onto suitable
supports.
2. Install the previously removed extend chain
assembly and clevis (1) at the top rear of the fourth
boom section. Allow 0.250 in (6,35 mm)(C) between
the end of the clevis (1) and the face of the lock nut
(2). Torque lock nut to 100 lb-ft (135 Nm).
3. Install the previously removed wear pads, spacers
and shims at the bottom rear of the fourth 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.
4. Install the previously removed wear pads and
spacers at the top rear of the fourth boom section
(4). 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. Install the previously removed wear pad and spacer
on each side of the fourth boom section (5). Snug
mounting bolts. Shim as needed AFTER boom
section is installed.
MY3470
12
13
11
13
MY3610 14
FRONT OF BOOM
MY3630
C
2 1
MY3490
5 5
3
4 4
3