© Feb. 2023 52 TB20J Plus Maintenance Manual
BOOM AND PLATFORM ASSEMBLY
6. Slowly remove the swing cylinder with the aid of the
lifting equipment.
Installation
Follow the reverse order of the disassembly procedures.
Upward Leveling Cylinder
• Before loosening or disassembling the hy-
draulic parts (especially the counterbalance
valve on the cylinder), ensure that the hydraul-
ic pressure of all hydraulic lines is released
and 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. Adjust the main boom and jib boom to horizontal,
and extend the main boom slightly until the connect-
ing pivot pin at the tail of the cylinder is accessible
and easy to be removed.
2. Mark and disconnect the hydraulic pipelines on the
upward leveling cylinder and collect the hydraulic oil
in the pipelines with a suitable vessel. Then seal the
pipelines and ports.
3. Use suitable lifting equipment to support the plat-
form and jib boom assembly.
4. Remove the fastening bolt at pivot pin #7 at the pis-
ton rod end of the upward leveling cylinder. Do not
move the pivot pin at this time.
5. Remove the retaining ring at shaft #8. Do not move
the shaft at this time.
6. Use suitable lifting equipment to support the piston
rod head of the upward leveling cylinder to protect
the piston rod from damage.
7. Knock out pivot pin #7 and shaft #8 with a brass rod
and mallet.
8. With the assistance of lifting equipment, slowly re-
move the upward leveling cylinder from the main
boom.
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.
6.3 BOOM
Cable Track Assembly
Fig 2 Fastening bolts on cable track assembly
Disassembly
1. Make sure the machine is in stowed position.
2. Mark and disconnect the harness connections on
the cable track assembly.
3. Mark and disconnect all hydraulic pipelines from the
cable track guide to the platform and collect the hy-
draulic oil in the pipelines with a suitable vessel.
Then seal the pipelines and ports.
4. Remove the hydraulic pipelines and wiring
harnesses from the cable track guide.
5. Support the cable track 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 cable track assembly from the boom
tube with the aid of the lifting equipment.
8. To disassemble the cable track separately, simply
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