BOOM MAINTENANCE SERVICE MANUAL 1400A
4-2 1-21-2019 Control # 104-07
BOOM REMOVAL
1. Extend and set machine outriggers. The boom must be
completely retracted and stowed in the boom rest.
2. If equipped, remove swing around jib according to
procedures outlined in the operators manual.
3. Remove hook block or down haul weight and:
• wind up the rope on the hoist drum
• stow the wedge socket on the pegs on the 1
ST
section
• shut down truck engine
4. Attach a lifting device to rod end of lift cylinder and:
• remove boom lift cylinder pin keeper and pin from
bottom of the 1
ST
section boom.
• lower lift cylinder to a suitable support.
5. Tag and disconnect extend cylinder lines and hoist
hydraulic lines. Cap all open lines and ports.
6. Attach a lifting device to provide even weight distribution
and raise the boom until weight is removed from the
boom pivot pin. Remove the boom pivot pin keeper and
boom pivot pin. Lift the boom free of the turret.
BOOM DISASSEMBLY
The boom can be disassembled by using two different
methods.
a. Alternative #1 disassembles the boom in the
conventional manner.
b. Alternative #2 removes the extend cylinder from the
rear of the boom, after removal of the hoist. This
feature facilitates cylinder service without complete
boom teardown.
For reference, left and right are viewed from the rear of the
boom. The hoist is mounted at the rear of the boom.
Use the procedures outlined below to service the boom while
still pinned to the turret.
1. Extend and set all outriggers and SFO.
2. Fully retract the boom and place in a horizontal position.
3. Hoist removal optional.
Boom
Nose
Proportioning
Cable
2
ND
Section
4
TH
Section
3
RD
Section
Retract Cables for
the 4
TH
Section
FIGURE 4-1
Extend Cables for
the 4
TH
Section
Retract Cables for
the 3
RD
Section
1
ST
Section
DANGER
Do not, under any circumstances, work at an elevated
height without using proper fall protection as required by
local, state or federal regulations.
Fo
r
Reference
Only
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