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ULTRAFLEX HYDRAULIC
STEERING SYSTEMS
HOW THE SYSTEM WORKS
Under normal operating conditions, a turn of the steering wheel
will send the oil from the helm unit into one of the two
connecting hydraulic lines.
The oil will be pumped into one of the chambers of the cylinder
and either extend or retract the cylinder rod, depending on the
steering wheel rotation.
The fluid going out from the other chamber of the cylinder is
returned to the helm via the other hydraulic line.
There are only two basic components in all the hydraulic steering
systems.
These are the helm unit and the cylinder, connected by nylon or
copper tubing. The helm unit consists of both a hydraulic pump and
a valve assembly.
The valve assembly prevents outgoing fluid from returning along
the same line, isolates each steering station, locks the rudder
and eliminates rudder "feedback" to the helm.
The cylinders are double acting and may be balanced or unbalanced,
(in which case the rod extends through only one end of the
cylinder).
SUGGESTIONS AND WARNINGS WHEN SELECTING AN HYDRAULIC STEERING
SYSTEM
The strength required to drive a boat equipped with an hydraulic
steering system is inversely proportional to the number of turns
of the wheel lock-to-lock. The wheel turns are determined by the
ratio between the cylinder volume, pump displacement and the
free movement of the rudder.
With the same type of cylinder installed on the engine, the less
are the turns, the faster is the response but higher is the
effort; more wheel turns, slower is the response and lower is
the effort.
Other factors that can influence steering effort are:
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Vessel speed
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Rudder dimension, or engine power
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Propeller selection
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Hull type (displacement, planning, etc.)
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Sea conditions
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Oil viscosity
CROSS REFERENCE
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FRONT MOUNT HELM PUMPS
UP28 F, UP33 F, UP39 F
FEATURES
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Available in three different displacement sizes
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Compact design
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Ball bearing piston race
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Built-in lock valve for positive rudder lock
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Integral relief valve for over-pressure protection
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3/4" tapered stainless steel shaft
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Easily accessible lock valve and shaft seal for replacement
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Cast iron rotor for greater durability and longer life
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Convenient front of dash fill
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1/4" NPT fitting for 3/8" tube
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Complete with elbow fittings
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X56 - 39465 S square flange or X57 - 39464 P round flange permit to
install the pumps in an intermediate dashboard position.
TECHNICAL DETAILS FRONT MOUNT PUMP
| UP28FM |
Front Mount Helm 1.7 CU. IN. 3/4" tapered shaft
|
$493.00 |
| UP33FM |
Front Mount Helm 2.0 CU. IN. 3/4" tapered shaft
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$518.00 |
| UP39FM |
Front Mount Helm 2.4 CU. IN. 3/4" tapered shaft
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$525.00 |
REAR MOUNT HELM PUMP UP39R
FEATURES
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Available in 39 cc/rev (2.4 cu.in/rev) displacement size
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Compact design
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Ball bearing piston race
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Built-in lock valve for positive rudder lock
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Integral relief valve for over-pressure protection
-
3/4" tapered stainless steel shaft
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Easily accessible lock valve and shaft seal for replacement
-
Cast iron rotor for greater durability and longer life
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1/4" NPT fitting for 3/8" tube
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Complete with elbow fittings
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KIT F optional remote fill adapter
TECHNICAL
DETAILS REAR MOUNT PUMP
| UP 39R |
Back Mount Helm 2.4 CU. IN. 3/4" Tapered shaft
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$579.00 |
TILT MOUNT HELM PUMPS
UP28 T, UP33 T, UP39 T
 
FEATURES
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Available in three different displacement sizes
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Compact design
-
Ball bearing piston race
-
Built-in lock valve for positive rudder lock
-
Integral relief valve for over-pressure protection
-
Stainless steel shaft
-
Easily accessible lock valve and shaft seal for replacement
-
Cast iron rotor for greater durability and longer life
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1/4" NPT fitting for 3/8" tube
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Complete with elbow fittings
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KIT F optional remote fill adapter (see page 64)
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Tilt mechanism:
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X52 - 39250 U - 90° mounting
NOTE: X52 tilt mechanism can be used with the Ultraflex T81FC,
T82FC, T83NRFC, T84NRFC mechanical steering helms also.
TECHNICAL
DETAILS TILT PUMP
| UP 28 T |
Tilt Helm, 1.7 CU. IN. 3/4" Tapered Shaft
(includes X52) |
$616.00 |
| UP 33 T |
Tilt Helm, 2.0 CU. IN. 3/4" Tapered Shaft
(includes X52) |
$638.00 |
| UP 39 T |
Tilt Helm, 2.4 CU. IN. 3/4" Tapered Shaft
(includes X52) |
$663.00 |
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