JLG G12-55A AccuPlace Service Manual - Manual (Page 29)

3.7 G10-55A & G12-55A AccuPlace
Boom
Remove the boom from supports and install the
remaining wear pads to the second boom section.
Do not shim or tighten bolts at this time.
14. Install the grease fittings for the wear pad and chain
roller assembly.
3.3.7 Second Boom Section Installation
1. Install the top, bottom and side rear wear pads onto
the second boom section. Do not shim or tighten the
bolts and this time.
2. Lubricate the inside of the first boom section on
areas where the second boom section wear pads
will slide.
3. Attach the chain clevis (3) to the rear of the third
boom section.
4. Using a suitable sling, balance the second, third and
fourth boom sections and carefully slide 3-4 ft into
the front of the first boom section. Set the second,
third and fourth boom sections on a suitable support
and reset the sling under the boom head of the
fourth boom section. Carefully slide the three boom
sections into the first boom section. Leave 6-8 in of
the two boom sections out to be able to install the
wear pad block and the wear pads in the front of the
first boom section.
5. Install the chain adjustment block (4) to the bottom of
the boom.
6. With the boom still supported, install the top wear
pads in the front of the first boom section. Remove
the boom from supports and install the remaining
wear pads to the first boom section. Do not shim or
tighten bolts at this time.
7. Lubricate the retract chain on the bottom of the
second boom section.
8. Install the lube fittings to the wear pad and chain
roller assembly.
9. Connect the chain clevis (5) to the second boom
section.
10. Assemble the rear bottom chain roller to the second
boom section.
11. Shim all wear pads needed to obtain the minimum
gap of 1/16 in (1,6 mm). Tighten all wear pad bolts to
the correct values. Refer to Section 3.7, “Boom Wear
Pads.”
12. Install the hose sheave to the second boom section.
13. Attach the hoses, and optional auxiliary hoses and
electrical cable to the hose carrier at the rear of the
boom.
14. At the rear of the boom, install the bracket (6) to the
back of the hose carrier.
15. Install the hose guide bracket for the electric and
hydraulic options at the rear of the boom.
16. Attach the chain clevis to the chain.
17. Install the hoses to the hose carrier at the rear of the
boom.
18. Install the hose guide bracket to the rear of the
second boom section.
19. Install the optional hydraulics and electrical cables if
equipped.
20. Connect the hose assembly to the take-up
weldment.
MX0440
4
MAP0670
6
5
MY1720
7