JLG G12-55A AccuPlace Service Manual - Manual (Page 37)

3.15 G10-55A & G12-55A AccuPlace
Boom
2. Park the machine on a hard, level surface, level the
machine, fully retract the boom, level the boom,
place the transmission control lever in (N)
NEUTRAL, engage the park brake and shut the
engine OFF.
3. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
4. Open the engine cover. Allow the system fluids to
cool.
5. Remove the battery negative (-) cable from the
battery negative (-) terminal.
6. Label and disconnect the tilt and auxiliary hydraulic
hoses attached to the sub-assembly at the rear of
the boom and at the front of the boom head. Plug
and cap the hose ends to prevent dirt and debris
from entering the hydraulic system.
7. If equipped, label and disconnect any electrical
connections at the front and rear of the boom
assembly.
Note: Tag or identify each hose to the corresponding
fitting it was removed from.
8. Loosen and remove both cap screws and locknuts
(2) from the sub-assembly bracket at the front of the
fourth boom section.
9. Loosen and remove the guide bracket (3) from the
front of the fourth boom section.
10. Loosen and remove the sub-assembly bracket (4) at
the rear of the third boom section.
11. Install a sling around the sub-assembly at the front of
the boom. With a suitable lifting device, slowly pull
the sub-assembly loose from the bottom bracket (5)
located approximately halfway in the fourth boom
section.
12. When the sub-assembly is pulled approximately
25% out of the boom, fasten the two hydraulic
carriers together using plastic tie wraps or nylon
straps to keep them from separating.
Note: Do Not wrap the hose carrier since it will not
prevent the two hydraulic carriers from moving apart
sideways.
13. Continue withdrawing the sub-assembly, fastening
the two hydraulic carriers together.
14. With the two hose carriers tied together, remove the
sub-assembly and set on the ground or proper
supports.
MY2710
1
3
2
MY2720
1
4
MY2700
5
FRONT