BOOM AND PLATFORM ASSEMBLY
AB16EJ Plus Maintenance Manual 51
© Mar. 2023
Disassembly
• Before disassembling the main boom assem-
bly, rotate the boom tube to be parallel to the
travel direction of the chassis, and make sure
the turntable is locked (if equipped with a ro-
tary pin, make sure the rotary pin is locked).
• Before disassembling the main boom assem-
bly, place solid and reliable rigid brackets
under the counterweight for support, or the
machine may tip over, causing serious person-
al injury and machine damage.
1. Make sure to remove the platform assembly, jib
boom assembly and upward leveling cylinder.
2. Raise the boom tube slightly until the main boom lift
cylinder is accessible and the main boom can be
easily removed.
3. Mark and disconnect all harness connections on the
main boom assembly.
4. Mark and disconnect all hydraulic pipelines on the
main boom assembly and collect the hydraulic oil in
the pipelines with a suitable vessel. Then seal the
pipelines and ports.
5. Use suitable lifting equipment (with the lifting ca-
pacity not less than 5t/11023lb) to support the main
boom tail (near the platform).
6. Use suitable lifting equipment to provide reliable
support for the main boom lift cylinder.
7. Remove the screw at the pivot pin #1 connecting
the main boom lift cylinder with the boom tube, and
knock out the pivot pin #1 with a brass rod and
mallet.
8. Use suitable lifting equipment (with the lifting ca-
pacity not less than 5t/11023lb) to support the main
boom head (near the turntable).
9. Reliably support the upper connector and downward
leveling cylinder with suitable lifting equipment.
10. Remove the retaining ring at the pivot pin #2 con-
necting the downward leveling cylinder with the
main boom, and knock out the pivot pin #2 with a
brass rod and mallet.
11. Remove the bolt at the pivot pin #3 connecting the
upper connector with the main boom, and knock out
the pivot pin #3 with a brass rod and mallet.
12. With the assistance of the lifting equipment, slowly
remove the main boom assembly from the turntable
and carefully place it on a suitable support.
Installation
Follow the reverse order of the disassembly procedures.
Articulated Boom Lift Cylinder
Fig 6 Articulated boom lift cylinder
Disassembly
• Before disassembling the lift cylinder, rotate
the boom tube to be parallel to the travel direc-
tion of the chassis, and make sure the turnta-
ble is locked (if equipped with a rotary pin,
make sure the rotary pin is locked).
• Before disassembling the lift cylinder, place
solid and reliable rigid brackets under the
counterweight for support, or the machine
may tip over, causing serious personal injury
and machine damage.
• Before loosening or disassembling the hy-
draulic parts (especially the counterbalance
valve on the cylinder), ensure that the hydraul-
ic pressure of all hydraulic lines is released
and that the hydraulic oil is completely cooled
down.
• Disassemble the hydraulic components
slowly to prevent the hydraulic oil from splash-
ing and injuring people.
1. Adjust the main boom to fully retracted and horizon-
tal position.
2. Raise the articulated boom slightly until the articu-
lated boom lift cylinder is accessible and can be
easily removed.
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