4 - 28
Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N
Part No. 139378
June 2011
Section 4 • Repair Procedures
REV A
5-2
Secondary Boom Lift Cylinder
The secondary boom lift cylinder raises and
lowers the secondary boom. The secondary
boom lift cylinder is equipped with counterbalance
valves to prevent movement in the event of a
hydraulic line failure.
How to Remove the Secondary
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 Rotate the turntable to either side until the boom
is centered between the steer and non-steer
tires.
2 Raise the primary boom to full height. Do not
extend it.
3 Swing out the battery pack that is directly below
the secondary boom lift cylinder.
4 Disconnect the battery packs from the machine.
SECONDARY BOOM COMPONENTS
5 Open the hydraulic tank side turntable cover.
6 Tag and disconnect the power cables on the
auxiliary power unit.
Electrocution/burn hazard. Contact
with electrically charged circuits
could result in death or serious
injury. Remove all rings, watches
and other jewelry.
7 Close the hydraulic tank shutoff valve. Tag and
disconnect and plug the hydraulic hose from
the hydraulic tank shutoff valve.
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.
8 Open the valve on the hydraulic tank and drain
the oil into a container of suitable capacity.
Refer to Section 2,
Specifications
.
Bodily injury hazard. Beware of
hot oil. Contact with hot oil may
cause severe burns.
9 Tag, disconnect and plug the hydraulic hose
from the hydraulic tank return filter housing.
Cap the fitting on the filter housing.
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.
Bodily injury hazard. Beware of
hot oil. Contact with hot oil may
cause severe burns.
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...