Telescopic Boom Assembly - Sinoboom GTZZ18J Maintenance Manual

NOTICE
Before re-installing the removed hoses and fittings,
check whether the seals on the hoses and fittings are
broken or missing; if any seal is damaged or missing,
replace the seal with a new one, or replace the hose
assembly and fittings directly. When installing hoses
and fittings, tighten them according to the specified
torque. See Hydraulic Hose and Fitting Specifica-
tions, page 2-7.
3
2
Figure 6-6
1. Place the machine on flat, firm ground.
2. Slightly raise the boom until the main boom luffing
cylinder and lower platform leveling cylinder are
accessible.
3. Tag and remove the hydraulic hoses and cables to
the chassis/turntable.
4. Using a suitable lifting device (capacity not less
than 2t), secure the lifting straps to the main boom
end.
5. Remove the bolt and nut at the pivot pin #1
connecting the piston rod end of main boom luffing
cylinder with the main boom.
UNSAFE OPERATION HAZARD
Throughout the process, use a
suitable supporting device to support
the main boom luffing cylinder to
prevent injury or damage due to the
unintended movement of cylinder.
6. Using a brass drift and wooden hammer, tap the
pivot pin #1 out.
7. Remove the bolt and nut at the pivot pin #2
connecting the piston rod end of lower platform
leveling cylinder with the main boom.
GTZZ18J Maintenance Manual
1
6-5
REPAIR PROCEDURES
UNSAFE OPERATION HAZARD
Throughout the process, use a
suitable supporting device to support
the lower platform leveling cylinder to
prevent injury or damage due to the
unintended movement of cylinder.
8. Using a suitable lifting device (capacity not less
than 2t), secure the lifting straps to the lower end of
the main boom.
9. Remove the bolt and nut at the pivot pin #3
connecting the boom assembly with the upper
connecting frame.
10. Using a brass drift and wooden hammer, tap the
pivot pins #2 and #3 out.
11. Using a lifting device, slowly move the boom
assembly away from the turntable.

Telescopic Boom Assembly

NOTICE
Before re-installing the removed hoses and fittings,
check whether the seals on the hoses and fittings are
broken or missing; if any seal is damaged or missing,
replace the seal with a new one, or replace the hose
assembly and fittings directly. When installing hoses
and fittings, tighten them according to the specified
torque. See Hydraulic Hose and Fitting Specifica-
tions, page 2-7.
Figure 6-7
1. Extend the telescopic boom to expose the pivot pin
#3 for easy removal. Remove the end circlip and
gasket at the fixed shaft #3 at the barrel end of the
telescopic cylinder, and remove the fixed shaft #3.
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5
1
3
2
© Oct. 2022