Harken 7415.15S MKIV Hydraulic Jib Reefing & Furling - Manual (Page 9)

MKIV Hydraulic Unit 5 9
Preassembly Hydraulic System
Hydraulic Length Adjusting Cylinder (Optional)
Pressure Requirements
The hydraulic length adjusting cylinder requires a pressure of Max. 3,000 psi (200 Bar) to develop rated pull force on the
headstay. A pressure relief valve must be used to ensure this pressure is not exceeded. 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 substantially less than 3,000 psi (200 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 15 - 30 lbs (1 - 2 Bar).
WARNING! Pressurized hydraulic cylinders can be dangerous and if handled improperly may explode.
Only work on this cylinder and connections if you are a hydraulic technician.
Specifications:
Stroke: Unit 5: 6" (152 mm)
Performance:
CYLINDER PULL FORCE LBS
30000
20000
15000
10000
5000
4000 2000 1000
Hydraulic pressure in LBS
Pull Force in LBS
0
0
25000
3000
CYLINDER PULL FORCE KG
14000
12000
8000
6000
4000
2000
0
Hydraulic pressure in BAR
Cylinder Pull force in KG
10000
200 100 50 150 250 0
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.