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Kobelt Steering Cylinders
Kobelt Manufacturing makes steering cylinders from 1.25"
I.D. to 10" I.D. The smaller models, up to 3" I.D., are made from
bronze and stainless steel.
On the 4" to 10" series, the cylinder tube and spherical
bearings are made from steel. The Piston Rods are made from
stainless steel, and are hard chromed and polished. All castings
are sand cast bronze or steel. On the larger cylinders, adjustable
rudder stops and “V” packings with adjustable packing nuts, are
standard.
Our Models 7040, 7050, 7065, 7080, 7085 and 7093
are available in both balanced and unbalanced versions. The
larger cylinder models 7094, 7096, 7097, 7098 and 7100 are
not available in a balanced version. When using unbalanced
cylinders, two or more must be used in a steering system.
The tables indicate rudder torque for both single and twin
cylinder steering applications.
If a single cylinder is used in a manual hydraulic steering
system, it is of utmost importance that the single cylinder
is of a balanced type. “Balanced” means that the cylinder
piston rod extends out of the cylinder at both ends. This will
give a balanced torque as well as equal volume displacement
in both directions. The manual Helm Pump has a relatively
small reservoir and using an unbalanced cylinder would cause
the reservoir to overflow or the pump to run empty, which is
unacceptable.
“Unbalanced” cylinders have the piston rod extending from
the cylinder only on one side. Since two cylinders are connected
to the same Tiller Arm or steering system, the volumes are
balanced out again. The lines from the source of hydraulic
pressure are crossed at the cylinders, providing equal volume
displacement in both directions. (See installation diagrams on
page 6.)
Ordering Options
B Balanced – specify stroke in inches
U Unbalanced – specify stroke in inches
7080
7050
7040
7094
4
hydraulic steering and accessories