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Hydromechanical (HM) Control
The Hydromechanical (HM) control
provides proportional operation of the reversing deflector (bucket) when
actuated by a push/pull cable from the helm. The HM control converts low
lever-efforts at the helm to hydraulic actuation of the reverse deflector,
even at full throttle. The HM control is available on the UltraJet models
251, 305, 305HT, and 340.
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The Hydromechanical control provides
low-effort proportional control of the reversing deflector (bucket).
Push/pull Type 33C cable movement is converted to hydraulic actuation of
the deflector at the hydromechanical unit.
The Hydromechanical control unit is mounted to the side of UltraJet models
251, 305, 305HT, and 340.
PLAY VIDEOS
QuickTime movies of boats with hydromechanical control.
Twin-jet police boat maneuvering (1.9MB).
Twin-jet Navy patrol boat (1.6MB).
Above videos courtesy of ABCO Industries
Single-jet security patrol boat (11.1MB).
Video courtesy of Hemnes Mek Verksted
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Hydromechanical Control Features
Low effort proportional control.
Smooth application of forward, reverse, or neutral thrust for optimum boat
maneuverability.
Multiple stations using master/slave helm units with connecting push/pull
cables.
Helm lever deflection provides a visual indication of deflector position.
Simple to maintain and service.
No electrics or electronics.
Compatible with most steering helm units from reputable suppliers.
For use with standard or hydraulic power-assisted steering.
Hydromechanical Options
Open-center valve for jet-driven hydraulic pump (Code K).
Closed-center valve for pressure compensated pumps (Code K1).
Open-center valve for jet-driven hydraulic pump plus power steering (Code
K2). |
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Hydromechanical Control
Details |
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Hydromechanical control assembly shown
mounted to an UltraJet 305. The 3 inch (76 mm) travel of the mechanical
push/pull cable actuates the hydraulic valve to send hydraulic fluid to the reversing
cylinder. A feedback link from the end of cylinder provides proportional
positioning of the reversing deflector relative to push/pull cable travel.
Click on photo for larger image. |
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View of the UJ305 reversing cylinder and
connection to the reversing deflector (bucket). This installation is typical
for the UltraJet 251, 305, 305HT, and 340 models.
Click on photo for larger image. |
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Single and
two-lever helm control units with 3 or 4 inch stroke, from most reputable
manufacturers, may be used to actuate the UltraJet Hydromechanical control.
Typically customer-supplied to conform with console configuration. Use 4
inch stroke helm units to allow for motion lost in bends of the push/pull
and still achieve the full 3 inch cable travel at the HM control. |
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Connection of the push/pull cable to the
lever on the Hydromechanical control assembly.
Click on photo for larger image.
SEE SECTION 6 OF MANUAL SUPPLIED WITH THE JET FOR ADDITIONAL INSTALLATION
INFORMATION. |
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Diagram and table showing relative
movement of the helm lever, cable, valve spool, hydraulic cylinder rod, and
reversing deflector for AHEAD and ASTERN operation of the boat.
Click here for a JPEG of this document. |
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Assembly drawing of the
Hydromechanical control with component part numbers. Click below for PDF
drawings of HM control assembly by UltraJet model.
2002-003-0AM/0DF for UJ251
2002-004-0AH/0DB for UJ305
2002-007-0AX/0DU for UJ305HT
2002-005-0AD/0DY for UJ340
Note: These drawings are
subject to revision so owners should first refer to Section 6 of manual
supplied with your UltraJet unit. |
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