You are here: Home > Product Tutorials > Steering System Tutorial > Uflex Hydraulic Steering System Guide

Appropriate hydraulic steering system selection
All the components of Ultraflex hydraulic steering systems are made specifically for the marine environment, using materials and working process which offer long life and safety for the most extreme conditions.

HOW THE SYSTEM WORKS
A manual hydraulic steering system consists of a helm which pumps hydraulic fluid through two hoses to a hydraulic cylinder which is mounted to an engine or rudder.
While steering, hydraulic oil is pushed through hoses into two chambers within the hydraulic cylinder. Depending upon which direction you steer, one of the two chambers is filled or relieved of oil, thereby changing the course of the boat.
While not actively steering, the torque (hydraulic pressure in the hoses) is held by a one way valve in the helm, which eliminates the transmission of the torque "feedback" to the steering wheel.
The number of turns from full lock-to-lock has a relationship to ease of steering. Generally speaking, the more number of turns lock-to-lock the easier the boat will be to steer and vice versa.
Because of the variety of applications and handling characteristics of boats, the number of turns lock to lock is often a matter of personal preference. As a general rule, the first priority should be ease of steering, then number of turns lock to lock. However, it is not recommended to have fewer than 4 turns lock to lock on high performance boats.
To calculate number of turns lock to lock simply divide the cubic inch displacement of the cylinder by the cubic inch displacement of the helm.
Other factors that can significantly affect the amount of effort to steer the system can be:
Fittings introduced between the helm and cylinder that restrict fluid efficiency
Oil viscosity
Type of hose and inside hose diameter.
Vessel speed
Trim angle
Rudder dimension, or engine power
Propeller selection
Hull type (displacement, planing, etc.)
Sea conditions

Hydraulic cross reference guide - Cylinders

OUTBOARD CYLINDERS

UFLEX
PART No.
TELEFLEX®
CROSS REFERENCE
DESCRIPTION
UC128OBF 1 HC5345 or HC5358 CYLINDER, 1.38" BORE, 7.8" STROKE, FRONT MOUNT - # 1 LINK ARM
UC128OBF 2 HC5345 or HC5358 CYLINDER, 1.38" BORE, 7.8" STROKE, FRONT MOUNT - # 2 LINK ARM
UC128OBF 3 HC5345 or HC5358 CYLINDER, 1.38" BORE, 7.8" STROKE, FRONT MOUNT - # 3 LINK ARM
UC128POBF 1 HC5345 or HC5358 CYLINDER, 1.38" BORE, 7.8" STROKE, FRONT MOUNT - PORT ENGINE CYLINDER
- # 1 LINK ARM
UC128POBF 2 HC5345 or HC5358 CYLINDER, 1.38" BORE, 7.8" STROKE, FRONT MOUNT - PORT ENGINE CYLINDER
- # 2 LINK ARM
UC128POBF 3 HC5345 or HC5358 CYLINDER, 1.38" BORE, 7.8" STROKE, FRONT MOUNT - PORT ENGINE CYLINDER
- # 3 LINK ARM
UC128-SVS 1 HC5345 or HC5358
or HC6750
or HC6751
or HC6752
HIGH PERFORMANCE CYLINDER, 1.38" BORE, 7.8" STROKE, FRONT MOUNT -
# 1 LINK ARM
UC128-SVS 2 HC5345 or HC5358
or HC6750
or HC6751
or HC6752
HIGH PERFORMANCE CYLINDER, 1.38" BORE, 7.8" STROKE, FRONT MOUNT -
# 2 LINK ARM
UC128P-SVS 1 HC5345 or HC5358
or HC67502
or HC6751
or HC675
HIGH PERFORMANCE CYLINDER, 1.38" BORE, 7.8" STROKE,
FRONT MOUNT-PORT ENGINE CYLINDER- # 1 LINK ARM
UC128P-SVS 2 HC5345 or HC5358
or HC6750
or HC6751
or HC6752
HIGH PERFORMANCE CYLINDER, 1.38" BORE, 7.8" STROKE,
FRONT MOUNT-PORT ENGINE CYLINDER- # 2 LINK ARM
UC94OBF 1 HC4645H or
C4647H or
HC4658H
CYLINDER, 1.18" BORE, 7.3" STROKE, FRONT MOUNT
(150 HORSEPOWER AND UNDER) - # 1 LINK ARM
UC94OBF 3 HC4645H CYLINDER, 1.18" BORE, 7.3" STROKE, FRONT MOUNT
(150 HORSEPOWER AND UNDER) - # 3 LINK ARM
INBOARD CYLINDERS
UFLEX
PART No.
TELEFLEX®
CROSS REFERENCE
DESCRIPTION
UC116-I HC5312 ALUMINUM CYLINDER, 1.25" BORE, 7" STROKE, BALL JOINT
UC168-I HC5314 or HC5318 ALUMINUM CYLINDER, 1.57" BORE, 7" STROKE, BALL JOINT
UC215-I HC5313 ALUMINUM CYLINDER, 1.57" BORE, 9" STROKE, BALL JOINT
UC293-I HC5314 BRASS CYLINDER, 2.0" BORE, 7" STROKE, BALL JOINT
UC378-I HC5378 or HC5379 BRASS CYLINDER, 2.0" BORE, 9" STROKE, BALL JOINT
I-B648 HC5378 or HC5379 CYLINDER, 2.36" BORE, 11" STROKE, BALL JOINT
SIDEMOUNT OUTBOARD CYLINDER
UFLEX
PART No.
TELEFLEX®
CROSS REFERENCE
DESCRIPTION
UC132-OBS HC5370 CYLINDER, 1.26" BORE, 8.0" STROKE, SIDE MOUNT
STERNDRIVE APPLICATION CYLINDERS
UFLEX
PART No.
TELEFLEX®
CROSS REFERENCE
DESCRIPTION
UC133-IOB HC5330 or HC5332 CYLINDER, 1.26" BORE, 8" STROKE, BALANCED
UC132-OBS HC5328 CYLINDER, 1.26" BORE, 8" STROKE, UNBALANCED
HYDRAULIC PARTS AND ACCESSORIES
UFLEX
PART No.
TELEFLEX®
CROSS REFERENCE
DESCRIPTION
BBUSTER POWER PURGE® PURGING SYSTEM FOR UFLEX HYDRAULIC STEERING SYSTEMS
KIT F HA5450 REMOTE FILL KIT OF UP TILT HELMS AND UP REAR MOUNT HELMS
OIL 15 HA5430 UFLEX HYDRAULIC OIL, 1 QUART
X64 HA5417 or HA5418 SQUARE BEZEL FOR HYDRAULIC HELMS
X57 HA5417 or HA5419 ROUND BEZEL FOR HYDRAULIC HELMS
KIT OB-LL HO51LL PREMADE HYDRAULIC HOSES
KIT OB BHBR-LL HO81LL PREMADE HYDRAULIC HOSES WITH BULKHEAD BEND RESTRICTORS
KITOB SVS-LL HO81LL TWO FLEXIBLE HOSES SILVER STEER HIGH PERFORMANCE
TU95-LL HT5LL NYLON TUBE IN 1 FT. INCREMENTS (NOT RECOMMENDED FOR OUTBOARD
APPLICATIONS)
KIT 95 2S HF5501 ADDITIONAL STATION FITTING KIT FOR 3/8" NYLON OR COPPER TUBE
Hydraulic cross reference guide - Packaged systems and Helms

PACKAGED SYSTEMS

UFLEX
MODEL
NUMBER
TELEFLEX®
CROSS REFERENCE
DESCRIPTION
HYCO 1.0 HK4200a - BayStar® FRONT MOUNT OUTBOARD SYSTEM FOR 150 HP AND LESS
PROTECH 1.0 HK6300 or HK6400 SeaStar® FRONT MOUNT OUTBOARD SYSTEM
PROTECH 2.0 HK6300 or HK6400 SeaStar® FRONT MOUNT OUTBOARD SYSTEM
PROTECH 3.0 HK6300 or HK6400 SeaStar® FRONT MOUNT OUTBOARD SYSTEM
PROTECH 1T HK6400TC or HK6400TS
or HK6500YTC SeaStar®
FRONT MOUNT OUTBOARD SYSTEM WITH TILT HELM
PROTECH 2T HK6400TC or HK6400TS
or HK6500YTC SeaStar®
FRONT MOUNT OUTBOARD SYSTEM WITH TILT HELM PACKAGE
PROTECH 3T HK6400TC or HK6400TS
or HK6500YTC SeaStar®
FRONT MOUNT OUTBOARD SYSTEM WITH TILT HELM

HELMS
UFLEX
MODEL
NUMBER
TELEFLEX®
CROSS REFERENCE
DESCRIPTION
UP20FM HH5270 FRONT MOUNT HELM, 1.2 CU.IN. 3/4" ANODIZED ALUM. TAPERED SHAFT
UP25FM HH5271 FRONT MOUNT HELM, 1.5 CU.IN. 3/4" TAPERED STAINLESS STEEL SHAFT
UP28FM HH5271 FRONT MOUNT HELM, 1.7 CU.IN. 3/4" TAPERED STAINLESS STEEL SHAFT
UP33FM HH5273 FRONT MOUNT HELM, 2.0 CU.IN. 3/4" TAPERED STAINLESS STEEL SHAFT
UP39FM HH5272 FRONT MOUNT HELM, 2.4 CU.IN. 3/4" TAPERED STAINLESS STEEL SHAFT
UP20T HH5291 or HH5740
or HH4315
TILT HELM, 1.2 CU.IN. 3/4" TAPERED SS SHAFT (X52 TILT INCLUDED & KIT F
OPTIONAL)
UP25T HH5291 or HH5741
or HH6191 or HH6491
or HH6541
TILT HELM, 1.5 CU.IN. 3/4" TAPERED SS SHAFT (X52 TILT INCLUDED & KIT F
OPTIONAL)
UP28T HH5291 or HH5741
or HH6191 or HH6491
or HH6541
TILT HELM, 1.7 CU.IN. 3/4" TAPERED SS SHAFT (X52 TILT INCLUDED & KIT F
OPTIONAL)
UP33T HH5290 or HH5774
or HH6145 or HH6490
TILT HELM, 2.0 CU.IN. 3/4" TAPERED SS SHAFT (X52 TILT INCLUDED & KIT F
OPTIONAL)
UP39T HH5292 or HH5742
or HH6192 or HH6492
or HH6542
TILT HELM, 2.4 CU.IN. 3/4" TAPERED SS SHAFT (X52 TILT INCLUDED & KIT F
OPTIONAL)
UP28R HH5261 BACK MOUNT 1.7 CU.IN. 3/4" TAPERED SS SHAFT *(KIT F OPTIONAL)
UP33R HH5262 BACK MOUNT 2.0 CU.IN. 3/4" TAPERED SS SHAFT *(KIT F OPTIONAL)
UP39R HH5263 BACK MOUNT 2.4 CU.IN. 3/4" TAPERED SS SHAFT *(KIT F OPTIONAL)
UP56R HH5263 BACK MOUNT 3.4 CU.IN. 3/4" TAPERED SS SHAFT
UP28F-SVS HH5770 1500 PSI-HIGH PERFORMANCE FRONT MOUNT HELM, 1.7 CU.IN. 3/4" TAPERED
SS SHAFT
UP33F-SVS HH5770 1500 PSI-HIGH PERFORMANCE FRONT MOUNT HELM, 2.0 CU.IN. 3/4" TAPERED
SS SHAFT
UP39F-SVS HH5770 1500 PSI-HIGH PERFORMANCE FRONT MOUNT HELM, 2.4 CU.IN. 3/4" TAPERED
SS SHAFT
UP28T-SVS HH5290 or HH5774
or HH6189
1500 PSI-HIGH PERFORMANCE TILT HELM, 1.7 CU.IN. TAPERED SS *(X52 TILT &
KIT F OPTIONAL)
UP33T-SVS HH5290 or HH5774
or HH6190
1500 PSI-HIGH PERFORMANCE TILT HELM, 2.0 CU.IN. TAPERED SS *(X52 TILT &
KIT F OPTIONAL)
UP39T-SVS HH5290 or HH5774
or HH6188
1500 PSI-HIGH PERFORMANCE TILT HELM, 2.0 CU.IN. TAPERED SS *(X52 TILT &
KIT F OPTIONAL)