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Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N
Part No. 139378
June 2011
Section 4 • Repair Procedures
REV A
PRIMARY BOOM COMPONENTS
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 counterbalance valves 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 secondary boom enough to access
the primary boom lift cylinder barrel-end
pivot pin.
2 Raise the primary boom enough to access the
primary boom lift cylinder rod-end pivot pin.
3 Support the primary boom lift cylinder with a
suitable lifting device. Place a block of wood
across the upper secondary boom to support
the cylinder when the rod-end pin is removed.
4 Attach an overhead crane to the primary boom
at the platform end for support. Raise the
primary boom using the overhead crane just
enough to relieve the pressure on the primary
boom lift cylinder rod-end pivot pin.
5 Remove the counterweight cover fasteners.
Remove the counterweight cover from the
machine.
6 Place a block of wood between the
counterweight plate on the leveling link and the
cross member of the upper secondary boom.
Carefully lower the secondary boom onto the
block.
Crushing hazard. Keep hands
away from the block and all
moving parts when lowering the
secondary boom onto the block.
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 lift cylinder may fall if not
properly supported when the
rod-end pivot pin is removed.
8 Lower the rod end of the cylinder onto the
blocks that were placed on the upper
secondary boom.
9 Remove the pin retaining fastener from the
ground control side upper secondary leveling
link pivot pin at the upper pivot (same side of
machine as the primary boom lift cylinder
barrel-end pivot pin retainer).
10 Place a rod through the upper secondary
leveling link pivot pin at the upper pivot and
twist to remove the pin.
Summary of Contents for Z-30/20N
Page 1: ......
Page 148: ...6 46 June2011 Section 6 Schematics 6 45 Power Cable Wiring Diagram...
Page 149: ...6 47 Section 6 Schematics June2011 6 48 Drive Contactor Panel Wiring Diagram...
Page 152: ...6 50 June2011 Section 6 Schematics Manifold and Limit Switch Wiring Diagram 6 49...
Page 153: ...6 51 Section 6 Schematics June2011 6 52 LVI BCI Option Wiring Diagram...
Page 156: ...6 54 June2011 Section 6 Schematics 6 53 Charger Interlock Option...
Page 157: ...6 55 Section 6 Schematics June2011 6 56 CTE Option CE Models...
Page 160: ...6 58 June2011 Section 6 Schematics Hydraulic Schematic 6 57...
