Sinoboom AB14EJ - Articulated Boom Lift Cylinder

© May 2023
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GTZZ14EJ&16EJ Maintenance Manual
BOOM AND PLATFORM ASSEMBLY
Disassembly
• 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.
1. Remove the main boom assembly and place it on a
suitable support.
2. Remove the retaining ring at the pivot pin #1 con-
necting the main boom and the telescopic cylinder,
and knock out the pivot pin #1 with a brass rod and
mallet.
3. Remove the nylon brush at the tail of the main
boom.
4. Remove the bolts, gaskets, shims and sliders from
the upper and lower surfaces #2 and both sides #3
at the main boom end.
5. Pull out the telescopic boom together with the tele-
scopic cylinder from the base boom end and place it
on a suitable support.
NOTICE
Take measures to prevent the telescopic cylinder
from rotating.
6. To remove the telescopic cylinder, proceed as
follows:
1) Remove the retaining ring at the connecting pin
that secures the telescopic cylinder piston rod
to the telescopic boom and knock out the pin
with a brass rod and mallet.
2) Use suitable lifting equipment to support the
front end of the telescopic cylinder and pull the
cylinder out of the telescopic boom head care-
fully and slowly.
NOTICE
When pulling the telescopic cylinder out of
the telescopic boom, take extra care to avoid
damaging other parts of the boom tube.
3) Before the telescopic cylinder is fully pulled out
of the telescopic boom, adjust the lifting equip-
ment to provide sufficient support for the entire
cylinder.
4) With the assistance of the lifting equipment,
slowly remove the cylinder from the telescopic
boom and carefully place it on a suitable
support.
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.
Articulated Boom Lift Cylinder
Fig 8 Articulated boom lift cylinder
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2