REPAIR PROCEDURES
AB18EJ&18HJ Maintenance Manual 6-5 © Oct 2020
NOTICE
When removing a hose or fitting, the O-ring on the
fitting or hose end must also be removed and tagged.
Figure 6-5
1. Place the machine on a solid, level surface.
2. Slightly raise the boom until the main lift cylinder
and master cylinder are accessible.
3. Tag, disconnect and plug 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 bottom end
of the main boom.
5. Remove the Bolts and nuts at the pin #1 connecting
the rod end of main lift cylinder with the main boom.
UNSAFE OPERATION HAZARD
Throughout the process, be sure
to use a suitable supporting device
to stablize the main lift cylinder to
prevent injury or damage due to
the unintended movement of
cylinder.
6. Using brass drift and wooden hammer, tap the pin
#1 out.
7. Remove the bolts and nuts at the pin #3 connecting
the rod end of master cylinder with the main boom.
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 bolts and nuts at the pin #2 connecting
the main boom with the upper upright..
10. Using brass drift and wooden hammer, tap the pins
#2 and #3 out.
11. Using a lifting device, slowly move the boom
assembly away from the turntable.
Telescopic Boom Assembly
NOTICE
When removing the hose and fittings, the O-ring at
the fittings or hose end must also be removed and
tagged.
Figure 6-6
1. Remove the bolts and shims at the stop block #1 at
the rod end of main boom telescopic cylinder, and
remove the stop block.
2. Remove the screws and shims at the position #2
and the wear pads and shims at the position #3 on
the upper surface and both sides of the boom tail.
3. Pull the telescopic boom with the telescopic cylinder
out of the main boom tail, and place them on a
suitable support.
UNSAFE OPERATION HAZARD
Take care to prevent the cylinder
from rotating.
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