Harken’s Integral Hydraulic Backstay Adjuster provides the power to optimize sail shape quickly. The cylinder features a built-in, double-acting pump that delivers oil when the handle is both pushed and pulled. This moves oil through the system twice as fast as single-acting pumps on other integrals.
Assemblies include a hardcoat-anodized aluminum cylinder and pump, valve, gauge, and stainless pump handle with three attachment options: pin installs handle permanently; O-ring secures handle in socket, but is not permanent; nonlocking handle installs without O-ring and roll pin. All pins and plugs are stainless steel. Cylinders include a clevis on both ends. Standard eye-jaw toggles fit all Harken® cylinders.
The pressure-release knob turns clockwise to close and pump, counterclockwise to release. When closing the pump, the knob cannot be over-tightened by hand, preventing damage to the valve. Release speed depends on how far open the knob is turned. Pressure relief is factory set to prevent crew from over-tensioning the backstay.
An analog gauge with pressure increments reading 0-5 (0-5000 psi) is prominently mounted at the top of the cylinder. The gauge adjusts to four positions for easy viewing from the cockpit. Harken integral backstay adjusters come in two sizes to fit boats with 5 to 7 mm (7/32 to 9/32 in) wire—approximately 9 to 12 m (30 to 39 ft).
Harken Adds Two Sizes to Double-Acting Hydraulic Backstay Adjuster Line
Harken has added two larger sizes to its line of Integral Hydraulic Backstay Adjusters. These additions to Harken's other two sizes have expanded the range to accommodate boats with wires from 5.5 to 9.5 mm (7/32 to 3/8 in) approximately 9-18 m (30-60 ft). In an industry first, the cylinder features an integrated double-acting pump that delivers oil when the handle is pushed and pulled, reducing pumping time by nearly doubling the flow of single-acting pumps standard on other integrals.
“Creative engineering and design allowed Harken to greatly improve our integrals over other systems out there,”said Harken Hydraulics Manager Robbie Young. “Our double-acting pumps deliver oil twice as fast as single-acting pumps which are standard on other integrals.”
Other key concepts:
The pressure release has been reconfigured, making it impossible for crew to over-tighten the screw by hand and damage the valve when closing it for pumping-a common problem on other cylinders.
A gauge with an easy-to-read analog display mounts at the top-not the bottom-of the cylinder for easy viewing from the cockpit. Pressure relief is factory set to prevent crew from over-tensioning the backstay.
Cylinders come standard in four sizes with a clevis on both ends. Assemblies include a hardcoat-anodized aluminum cylinder and pump, valve, gauge, and stainless pump handle with three attachment options. All pins and plugs are stainless steel. Clear-anodized aluminum cylinders are available upon request.