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.