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Teleflex Hynautic Inboard Hydraulic Steering




Technical Reference Manual




SeaStar offers rugged 3-line Hynautic Heavy Duty steering systems for most work and pleasure vessels up to 70 feet.

Heavy Duty helms combine one or two bi-directional axial piston pumps with pilot check and make-up check valving. The result is a unit which prevents rudder feedback, is very efficient (even at low RPM), and is immediately adaptable to multi-station use.

A wide choice of helm displacements and cylinder configurations make it easy to spec a system which can handle a variety of large boat performance requirements and accommodate most user preferences.


Features:

  • Low friction heavy duty hydraulic steering.
  • Helm/cylinder combinations for most inboards. Marine grade materials.
  • Heavy duty helms available in three displacements, to accommodate most applications and user preferences.
  • Helms available with 1" straight shaft or 3/4" tapered. Mount facing any direction.
  • Quick air purge relief valve.
  • Fluid fill at remote reservoir.
  • Heavy duty brass cylinders. Two-axis articulation. Easy installation for single or dual rudder vessels.
  • Meets or exceeds applicable standards.
  • Accepts most steering wheels.


How to Spec a System:


  • 1. From the application guide select components appropriate for the vessel based on:
  • a) hull type displacement or planing; b) length of vessel; and d) number of steering wheel turns desired.
  • 2. Select the fitting and hose kits required, based on type of plumbing (1/2" or 5/8" tubing or hose) and based on number of steering stations.
  • 3. Confirm that there is sufficient space available in the dash and engine compartment(s) for the steering components. See helm and cylinder dimensions at the end of this section.

Components:


  • Hynautic 2.75 cu. in. helm (1" straight shaft).......H-21 or
  • Hynautic 2.75 cu. in. helm (3/4" tapered shaft).....H-25 or
  • Hynautic 4.0 cu. in. helm (1" straight shaft).........H-42 or
  • Hynautic 4.0 cu. in. helm (3/4" tapered shaft).H-42-02 or
  • Hynautic 5.5 cu. in. helm (1" straight shaft).........H-41 or
  • Hynautic 5.5 cu. in. helm (3/4" tapered shaft)......H-41-02 (See application guide on next page.)
  • H-20 Fittings Kit for Main Station......................HF-10
  • H-40 Fittings Kit for Main Station......................HF-21
  • Inboard Cylinder.................................HC53__ or K-_
  • (See application guide on next page. 1 or 2 required.)
  • Reservoir - Standard (2 quart)............................R-06
  • Relief Valve (950 PSI)...................................MSV-21
  • Relief Fittings (1150 & 1175-21-1)..............MSVF-07
  • Relief Fittings (1175-42-1 & up)..................MSVF-13
  • Copper Tubing....................................1/2" or 5/8" OD
  • (See application guide on next page.)
  • Fitting Kit (for 1/2" Copper Tubing)............HF5590 or
  • Fitting Kit (for 5/8" Copper Tubing)................HF5592
  • (See application guide on next page.These fitting kits are for one steering station; purchase add-a-station kit for 2nd station.)
  • Hose Kit for Copper Tubing (2 hoses)...........HA5731
  • Contains two 18" (.45m) hoses for single-cylinder installations.
  • SeaStar Oil (1 Gallon)...................................HA5440
  • (Other fittings may be required. Contact Teleflex Canada.)

    Options:

    Pivot Mount Inboard Cylinder.............................K-31

    Dual Cylinder Hose 2' (.6m)..........................HA5732

    Dual Cylinder Hose 3' (.9m)..........................HA5733

    Dual Cylinder Hose 4' (1.2m)........................HA5734

    Dual Cylinder Hose 5' (1.5m)........................HA5735

    Dual Cylinder Hose 6' (1.8m)........................HA5736

    Hoses sold individually (4 required for dual cylinder installations).

    Reservoir (2 quart, with hand pump)..................R-07

    Reservoir (1 quart, with hand pump)..................R-11

    Reservoir (2 quart)..............................................R-12

    Relief Valve (500 PSI)...................................MSV-19

    Reservalve (500 PSI, top read, 3/8).................RV-55

    Reservalve (500 PSI, top read, 3/8, w/pump)RV-55P

    Reservalve (500 PSI, top read, 5/16, w/pump).RV-57

    Reservalve (950 PSI, top read, 5/16)...............RV-60

    Reservalve (950 PSI, frt.read, 5/16, w/pump)..RV-67

    H-20 Fittings Kit for Second Station.................HF-11

    H-40 Fittings Kit for Second Station.................HF-22



    Service Items:


    Reservoir (2 quart, with hand pump)..................R-07

    Reservoir (1 quart, with hand pump)..................R-11

    Reservoir (2 quart)..............................................R-12

    Relief Valve (500 PSI)...................................MSV-19

    Reservalve (500 PSI, top read, 3/8).................RV-55

    Reservalve (500 PSI, top read, 3/8, w/pump).RV-55P

    Reservalve (500 PSI, top read, 5/16, w/pump)..RV-57

    SeaStar Oil (1 Gallon)...................................HA5440








    Application Guide: 3-Line Inboard Steering:





    Helm Options:

    Four helms are offered in 3 displacements, as noted in the chart at right. The H-21 helm has a 1" straight wheel shaft; H-25 has a 3/4" tapered shaft. The H-42 and H-41 helms both have a 1" straight wheel shaft.







    Tubing/Hose Options:

    Use soft refrigeration type copper tubing for optimum performance. For tube-to-cylinder flex hoses, select a hydraulic hose rated for 1000 PSI (70 bar) working pressure, and with a very low volumetric expansion rating.




    Cylinder Options:

    Cylinders are made from brass & stainless steel. Available with stainless rod & ball joint (TMB models) or stainless rod & bronze clevis (TMC models.) Cylinders with ball joints have 2-axis articulation.

    The K-31 is an optional pivot mount cylinder which can be used in the systems numbered "8a" and "8b" on the opposite page. With this cylinder, the number of wheel turns becomes 6.4 (using the H-42 helm) or 4.6 (H-41 helm). The Application Guide at left should be used with discretion.

    The chart is only a guide to selecting a steering system. A steering system manufacturer cannot anticipate all the variables in boat-rudder design that affect steering loads. It is the final responsibility of the boat designer/builder to specify maximum expected steering loads. If the required information is not available, contact our customer service department at 604-279-2202 (www.teleflexmarine.com) with rudder dimensions, vessel size and anticipated maximum vessel speed.



    Definitions of terms used in the charts on these pages:

    Planing Hull: maximum hull speed normally exceeds 18 knots.

    Displacement Hull: maximum hull speed does not normally exceed 18 knots.

    Diameters: Copper tubing diameter shown is O.D. Hose diameter shown is I.D.

    NOTE: When properly installed, this steering system will connect to inboard engines using appropriate engine/rudder connection hardware.



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