Cylinder Installation - Eaton Vickers TZ Series Installation & Service Manual

Cylinder Installation

All Vickers Series TZ cylinders are
individually tested and inspected before
shipment to assure freedom from
defects. Plugs are inserted in the ports
to protect threads and keep foreign
matter from entering the cylinder prior to
installation.
Mounting and alignment
Position the cylinder loosely in the
mounting and check the alignment of the
piston rod with the load connection at
both ends of the stroke. If the cylinder
is too large to move by hand, proceed
with piping and installation and operate
cylinder throughout the stroke prior to
connection.
Trunnion and swivel mount bearings
should fit closely for the entire length of
the pin, and must be square with the
load connection throughout the stroke.
Flush or foot mounted cylinders may be
pinned or keyed to prevent shifting
during high shock loads.
Always use the wrench flats when
connecting piston rod to load to prevent
damage to the sealing surface. Tighten
piston rod against shoulder. If cylinder
has been pressurized, relieve all
pressure prior to turning the piston rod.
2
Piping connections
All piping connections should be
deburred and the system thoroughly
flushed to purge all contaminants prior to
connecting cylinder ports. Care should
be taken to prevent over tightening of
the piping connections.
Cylinder operation
Cycle cylinder a few times with reduced
load and pressure. Hydraulic cylinders
may be erratic due to trapped air, but will
normally purge themselves after several
cycles. Some cylinders may be
equipped with air bleed screws which
can be slowly loosened with a male
metric key wrench, then re-tightened
after air is purged.
Cushioned cylinders are adjusted and
tested prior to shipping, but usually
require additional adjustment after
connection to the work load. The
cushion adjustment screw has a retainer
plate to prevent inadvertent removal of
the screw. A male metric hex wrench is
required to adjust the cushion screw.
To increase effectiveness of the cushion,
turn the adjustment screw clockwise. To
provide less cushion, turn the screw
counterclockwise. Most orifices are fully
open with two full turns of the screw from
the closed position.
The final position of the screw should be
a balance between any shock or bounce
at the start of the cushion and the final
impact of the piston at the end of stroke.