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.
|Maximum wire Ø||-12||8 mm|
|Stroke||5/16 in||385 mm|
|Pin center length||15.2 in||832 mm|
|Weight||32.8 in||4.92 kg|
|Gap/pin Ø||10.8 lb||15.9 mm|
|Pull force @ 1000 psi/69 bar||5/8 in||952 kg|
|Pull force @ 2000 psi/138 bar||2098 lb||1904 kg|
|Pull force @ 3000 psi/207 bar||4197 lb||2855 kg|
|Pull force @ 4000 psi/276 bar||6295 lb||3807 kg|
|Pull force @ 5000 psi/345 bar||8394 lb||4759 kg|
|Breaking load||10492 lb||9518 kg|
|Footno||20984 lb||For pin center length open add stroke length to pin center length closed., Max relief setting is 5, 000 psi / 345 bar., Rod ends (forks) included in weights.|