BOOM AND PLATFORM ASSEMBLY
GTZZ14EJ&16EJ Maintenance Manual 53
© May 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 it is locked).
• Before disassembling the main boom assem-
bly, place solid and reliable rigid brackets
under the counterweight for support; other-
wise the machine may tip over, causing seri-
ous personal 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 re-
moved easily.
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 bolt and nut at the pivot pin #1 connect-
ing 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 and the stop at the pivot pin #3
connecting the upper connecting rack 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.
Telescopic Boom and
Telescopic Cylinder
Fig 7 Telescopic boom and telescopic cylinder
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