BOOM AND PLATFORM ASSEMBLY
GTZZ14EJ&16EJ Maintenance Manual
55
© May 2023
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, otherwise the ma-
chine 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), the hydraulic pressure
of all hydraulic lines should be released and
ensure 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.
3. Reliably support the main boom and upper connec-
tor with suitable lifting equipment to prevent the
boom tube from falling during disassembly.
4. Mark and disconnect the hydraulic pipelines on the
articulated boom lift cylinder and collect the hydraul-
ic oil in the pipelines with a suitable vessel. Then
seal the pipelines and ports.
5. Support the two ends of the articulated boom lift cyl-
inder with suitable lifting equipment.
6. Remove the screw at the pivot pin #1 connecting
the articulated boom lift cylinder with the lower con-
nector, and knock out the pivot pin #1 with a brass
rod and mallet.
7. Remove the bolt at the pivot pin #2 connecting the
articulated boom lift cylinder with the lower articu-
lated boom, and knock out the pivot pin #2 with a
brass rod and mallet.
8. Slowly remove the articulated boom lift cylinder with
the aid of the lifting equipment.
9. Slowly lower the boom tube to stowed position with
the aid of the lifting equipment.
When disassembling the cylinder, take care to
prevent damage caused by the cylinder falling
and impacting, and also prevent the high-
pressure oil leakage due to impacting.
Installation
Follow the reverse order of the disassembly procedures.
Articulated Boom Assembly
Fig 9 Articulated boom assembly
Table 6-2 Articulated boom assembly
No.
Description
A
Upper connecting rack
B
Upper articulated boom
C
Upper linkage
D
Lower connecting rack
E
Linkage
F
Articulated boom lift cylinder
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