BOOM AND PLATFORM ASSEMBLY
TB20J Plus Maintenance Manual 53
© Feb. 2023
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 cable track 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 3 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
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.
Disassembly
1. Raise the boom tube slightly until the downward lev-
eling cylinder is accessible and can be easily
removed.
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 bolt at the pivot pin #1, and
knock out the pivot pin #1 with a brass rod and
mallet.
5. Remove the retaining bolt 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 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.
Lift Cylinder
Fig 4 Lift cylinder
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