© May 2023
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GTZZ14EJ&16EJ Maintenance Manual
BOOM AND PLATFORM ASSEMBLY
Table 6-2 Articulated boom assembly(Continued)
No.
Description
G Lower articulated boom
H
Lower linkage
I Turntable
Disassembly
• Before disassembling the articulated boom
assembly, 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
rotary pin, make sure the rotary pin is locked).
• Before disassembling the articulated boom
assembly, place solid and reliable rigid brack-
ets under the counterweight for support, or the
machine may tip over, causing serious person-
al injury and machine damage.
1. Raise the boom tube slightly until the articulated
boom assembly can be removed easily.
2. Remove the main boom assembly, main boom lift
cylinder, and downward leveling cylinder.
3. Mark and disconnect all harness connections on the
articulated boom assembly.
4. Mark and disconnect all hydraulic pipelines on the
articulated boom assembly and collect the hydraulic
oil in the pipelines with a suitable vessel. Then seal
the pipelines and ports.
5. Support the upper and lower connecting racks reli-
ably with suitable lifting equipment.
6. Support the upper linkage reliably with suitable lift-
ing equipment.
7. Remove the bolt and stop at the pivot pin #2 con-
necting the upper linkage with the upper connecting
rack, and knock out the pivot pin #2 with a brass rod
and mallet.
8. Remove the retaining ring and shim at the pivot pin
#6 connecting the upper linkage with the lower con-
necting rack, and knock out the pivot pin #6 with a
brass rod and mallet.
9. Remove the upper linkage slowly with the aid of the
lifting equipment.
10. Support the upper articulated boom, articulated
boom lift cylinder and linkage reliably with suitable
lifting equipment.
11. Remove the bolt and stop pin at the pivot pin #4
connecting the upper articulated boom with the link-
age, and knock out the pivot pin #4 with a brass rod
and mallet.
12. Remove the bolt and nut at the pivot pin #3 connect-
ing the upper articulated boom with the lift cylinder,
and knock out the pivot pin #3 with a brass rod and
mallet.
13. Remove the bolt and stop at the pivot pin #1 con-
necting the upper articulated boom with the upper
connecting rack, and knock out the pivot pin #1 with
a brass rod and mallet.
14. Remove the bolt and nut at the pivot pin #5 connect-
ing the upper articulated boom with the lower con-
necting rack, and knock out the pivot pin #5 with a
brass rod and mallet.
15. Remove the upper articulated boom slowly with the
aid of the lifting equipment.
16. Support the lower linkage reliably with suitable lifting
equipment.
17. Remove the bolt and nut at the pivot pin #7 connect-
ing the lower linkage with the lower connecting rack,
and knock out the pivot pin #7 with a brass rod and
mallet.
18. Remove the lower articulated boom lift cylinder
slowly with the aid of the lifting equipment.
19. Remove the bolt and nut at the pivot pin #10 con-
necting the lower linkage with the turntable, and
knock out the pivot pin #10 with a brass rod and
mallet.
20. Remove the lower linkage slowly with the aid of the
lifting equipment.
21. Support the lower articulated boom reliably with
suitable lifting equipment.
22. Remove the bolt and nut at the pivot pin #8 connect-
ing the lower articulated boom with the linkage, and
knock out the pivot pin #8 with a brass rod and
mallet.
23. Remove the linkage slowly with the aid of the lifting
equipment.
24. Remove the bolt and nut at the pivot pin #9 connect-
ing the lower articulated boom with the lower con-
necting rack, and knock out the pivot pin #9 with a
brass rod and mallet.
25. Remove the bolt and stop pin at the pivot pin #11
connecting the lower articulated boom with the turn-
table, and knock out the pivot pin #11 with a brass
rod and mallet.
26. Remove the lower articulated boom slowly with the
aid of the lifting equipment.
Installation
Follow the reverse order of the disassembly procedures.
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