Sinoboom AB14EJ - Downward Leveling Cylinder

BOOM AND PLATFORM ASSEMBLY
GTZZ14EJ&16EJ Maintenance Manual
51
© May 2023
Then seal the pipelines and ports.
4. Remove the hydraulic pipelines and wiring har-
nesses from the drag chain guide.
5. Support the drag chain assembly along the length
with suitable lifting equipment.
6. Remove the fastening bolts indicated by the arrows
above.
7. Take appropriate preventive measures and slowly
remove the drag chain assembly from the boom
tube with the aid of the lifting equipment.
8. To disassemble the drag chain separately, simply
remove the fastening bolts at both ends of the cable
track.
Inspection
• Check all threaded parts for elongation, thread defor-
mation, torsion or other damage. Replace the part if
needed.
• Check all structures of the drag chain assembly for
deformation, cracks, weld separation or other dam-
age. Replace the structure if necessary.
Installation
Follow the reverse order of the disassembly procedures.
Downward Leveling Cylinder
Fig 4 Downward leveling cylinder
• 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
the hydraulic oil should cool down completely.
• Disassemble the hydraulic components
slowly to prevent the hydraulic oil from splash-
ing and injuring people.
Disassembly
1. Raise the boom tube slightly until the downward lev-
eling cylinder is accessible and can be removed
easily.
2. Mark and disconnect the hydraulic pipelines on the
downward leveling cylinder and collect the hydraulic
oil in the pipelines with a suitable vessel. Then seal
the pipelines and ports.
3. Support the downward leveling cylinder with suit-
able lifting equipment.
4. Remove the retaining ring at the pivot pin #1 and
knock out the pivot pin #1 with a brass rod and
mallet.
5. Remove the retaining bolt and the stop at the pivot
pin #2, and knock out the pivot pin #2 with a brass
rod and mallet.
6. Slowly remove the downward leveling cylinder with
the aid of the lifting equipment.
When disassembling the cylinder, take care to
prevent the cylinder from falling and impacting,
and also prevent the high-pressure oil leakage
due to impacting.
Installation
Follow the reverse order of the disassembly procedures.
1
2