Harken 7413.15 MKIV Hydraulic Jib Reefing & Furling - Manual (Page 8)

8 MKIV Hydraulic Unit 3
Hydraulic General Specifications/Valves/Operation Pressure/Oil
Important: Hydraulic oil may damage paint and some surfaces.
Leak Check
To perform leak check, run furler in a single direction for 5 – 10 seconds. If installation was completed with empty
hoses, increase the run time to 10 – 30 seconds. Perform the following:
1) Confirm hose run is correct by verifying operation of intended function.
2) Inspect each fitting for leakage.
3) Tighten fitting as necessary.
4) Repeat procedure for all functions.
IMPORTANT: If installation was completed with empty hoses, check the oil level indicator after, and add oil as necessary.
One-Way Function Flush
Flush the pump motor through the power unit system filter by running furler in a single direction. Run in same
direction as previous step. This process helps ensure system cleanliness by depositing any contaminates into the
power unit system filter.
Hydraulic Connection to Furling Unit
Use Stainless Steel -6 ORB to -6 JIC Adapters.
Important: Do not use PTFE tape or sealant on threaded connections to Harken ports. Using PTFE tape can damage threads.
Hydraulic Oil
Use only hydraulic oil ISO 46 grade or equivalent.
CAUTION! Hydraulic oil may cause skin irritation.
Hydraulic Length Adjusting Cylinder (Optional)
Pressure Requirements
The hydraulic length adjusting cylinder requires a pressure of Max. 5,000 pounds (350 Bar) to develop rated pull
force on the headstay. The hydraulic pressure for the cylinder can be provided by a high pressure manual system or
the boats power unit. If the cylinder is used with a power unit providing less than 5,000 psi (350 Bar), a hydraulic
intensifier is required to step up the pressure. Either power source requires the use of a zero leak control valve so
the pressure to the cylinder doesn’t bleed down over time.
Hydraulic Cylinder Hose Connection
The cylinder has a -4 JIC fitting. Choose appropriate hose and end fitting.
Cylinder Gas
Cylinder is shipped without gas. Fill fitting is a Schroeder type. For best clean performance use Nitrogen or Argon
gas pressurized to 50 - 65 lbs.
Specifications:
Stroke: Unit 3: 4" (100 mm)
Performance:
CYLINDER PULL FORCE LBS
12000
10000
8000
6000
4000
2000
0
6000 4000 2000
Hydraulic pressure in LBS
Cylinder pull in LBS
0
CYLINDER PULL FORCE KG
6000
5000
4000
3000
2000
1000
0
400 200 100
Hydraulic pressure in BAR
Cylinder pull in KG
300 0
WARNING! Relieve all pressure prior to disconnecting. Only work on cylinder and connections
if you are a hydraulic technician.