JLG 534D-10 - Manual (Page 37)

3.9 534D-9, 534D-10 & 544D
Boom
3.4 BOOM MAINTENANCE - THREE
SECTION
(INDIVIDUAL SECTION REMOVAL)
These general instructions help with the removal of
individual boom sections with the boom still mounted on
the machine. Safe practices and common sense must be
followed when removing boom sections.
Before beginning, conduct a visual inspection of the
machine and work area, and review the task about to be
undertaken. Read, understand and follow these
instructions taking into consideration your particular
situation.
For more detailed instructions, see Section 3.3, “Boom
Maintenance - Three Section (Complete Removal).”
3.4.1 Push Beam and Third Boom Section
Removal
1. Park the machine on a firm, level surface, fully
retract the boom, lower the boom to a level position,
place the transmission control lever in (N)
NEUTRAL, engage the park brake and shut the
engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Remove the battery negative (-) cable from the
battery negative (-) terminal.
Note: When removing a boom section(s), use a lifting
device with a sufficient lift capacity. (A complete three
section boom assembly weighs approximately 5700 lbs.)
5. Label, disconnect and cap all hydraulic hoses
attached at the tilt cylinder. Cap all fittings and
openings to keep dirt and debris from entering the
hydraulic system.
6. Remove the tilt cylinder from the third boom section.
7. Disconnect and cap the tilt hoses attached at the
bulkhead bracket. Disconnect and cap the auxiliary
hoses attached at the bulkhead bracket if equipped.
8. Remove the bulkhead brackets (1).
9. Remove the guide plate and bar (2) from the top
front of the push beam.
10. Release tension from the hoses on the hose take-up
bracket (3).
11. Label, disconnect and cap all hydraulic hoses
attached at the take-up bracket (4). Cap all fittings
and openings to keep dirt and debris from entering
the hydraulic system.
12. If equipped, label, loosen and separate all electrical
cables at the take-up bracket.
13. Remove the take-up brackets (5).
14. Loosen and remove the jam nuts on the retract cable
(6) at the bottom of the first boom section.
15. Label, disconnect and cap both hydraulic hoses (7)
attached to the extend/retract cylinder. Cap all
fittings and openings to keep dirt and debris from
entering the hydraulic system.
16. Loosen and remove the jam nuts on the two extend
cables (8) at the strong back.
17. Remove the pin (9) holding the extend/retract
cylinder at the strong back.
18. Loosen and remove the bolts holding the strong
back to the rear of the first boom section. Remove
the strong back.
19. Remove the two pins (10) holding the push beam at
the rear of the second boom section.
20. Loosen and remove the wear pads from the front of
the second boom section. Note the location of the
wear pads, mounting bolts and number of shims
from each location.
21. Loosen and remove the wear pads from the top rear
and one side of the third boom section. Note the
location of the wear pads, mounting bolts and
number of shims from each location.
22. Remove hose guide (11) from the rear of the second
boom section.
MX1370
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