Terex Genie Z-45/25 Bi-Energy, Руководство по обслуживанию, Страница: 89 / 213

Part No. 237062 Z-45/25 Bi-Energy • Z-45/25J Bi-Energy 4 - 17
September 2015 Section 4 • Repair Procedures
4-3
Primary Boom Lift Cylinder
The primary boom lift cylinder raises and lowers the
primary boom. The primary boom lift cylinder is
equipped with a counterbalance valve to prevent
movement in the event of a hydraulic line failure.
How to Remove the Primary
Boom Lift Cylinder
Bodily injury hazard. This
procedure requires specific repair
skills, lifting equipment and a
suitable workshop. Attempting this
procedure without these skills and
tools could result in death or
serious injury and significant
component damage. Dealer
service is strongly recommended.
Note: When removing a hose assembly or fitting,
the O-ring on the fitting and/or hose end must be
replaced and then torqued to specification during
installation.
Refer to Section 2,
Hydraulic Hose and Fitting
Torque Specifications.
1 Raise the primary boom to a horizontal position.
2 Raise the secondary boom until the primary
boom lift cylinder barrel-end pivot pin is above
the turntable covers.
3 Attach a 5 ton / 5000 kg overhead crane to the
primary boom for support.
4 Raise the primary boom with the overhead
crane slightly to take the pressure off the
primary boom lift cylinder pivot pins.
5 Support the rod end and the barrel end of the
primary boom lift cylinder with a second
overhead crane or similar lifting device.
6 Tag, disconnect and plug the primary boom lift
cylinder hydraulic hoses. Cap the fittings on the
cylinder.
Bodily injury hazard. Spraying
hydraulic oil can penetrate and
burn skin. Loosen hydraulic
connections very slowly to allow
the oil pressure to dissipate
gradually. Do not allow oil to
squirt or spray.
7 Remove the pin retaining fasteners from the
primary boom lift cylinder rod-end pivot pin. Use
a soft metal drift to remove the pin.
Crushing hazard. The primary
boom will fall if not properly
supported when the primary boom
rod-end pivot pin is removed.
8 Place a support block across both turntable
covers under the primary boom lift cylinder.
9 Lower the rod end of the lift cylinder onto the
block. Protect the cylinder rod from damage.
Crushing hazard. The primary
boom lift cylinder could fall if not
properly supported.
10 Support the barrel end of the primary boom lift
cylinder with an overhead crane or similar lifting
device.
11 Remove the primary boom lift cylinder barrel-
end pivot pin retaining fasteners. Use a slide
hammer to remove the barrel-end pivot pin.
Carefully remove the primary boom lift cylinder
from the machine.
Crushing hazard. The lift cylinder
could become unbalanced and fall
if not properly supported and
secured to the lifting device.
PRIMARY BOOM COMPONENTS