Harken 7415.15S MKIV Hydraulic Jib Reefing & Furling - Manual (Page 8)

8 MKIV Hydraulic Unit 5
Preassembly Hydraulic System
Furler Power Requirements
The furling unit and hydraulic tensioning cylinder will work
with all current Harken hydraulic power plants. They are
designed to provide 10 g/m (37.8 l/min) at load.
Maximum Operating Pressure
Set relief valve on power plant at 140 Bar or 2000 PSI. Harken power packs ship with valves set at 140 Bar.
Valves on Power Unit
Furler can be used with open or closed center, 4-way, 3-position control valves.
Gear Oil Specifications
Unit is sealed with a light bath of ISO 68 gear oil.
CAUTION! The only parts of furler to be disassembled by installer are the Torque Tube Clamp
and Toggle Housing. All other work should be performed by factory-authorized personnel.
Work performed by unauthorized personnel may void the Harken limited warranty.
Hose and Fitting Selection Recommendation
Required hose type: SAE 100 R2 or SAE 100 R8. Hose size is determined by flow and run length between
power unit and furler.
Measure hydraulic hose runs
Remember these important points when measuring runs.
1) Short straight runs between HPU and function are best.
2) Avoid sharp edges which may chafe the hose.
3) Minimize fittings/connections throughout the run to avoid possible leak points.
4) Minimize 90° bends, which increase system losses and decrease performance. If unavoidable use a 90° swept
fitting, Do not use a 90° elbow fitting.
CAUTION! Do not exceed the manufacturer specified minimum bend radius.
When ordering, specify that all hoses are flushed, filled with clean oil and capped at point of purchase. HARKEN
recommends ISO 46 grade oil. If hoses are shipped, they may not contain oil.
CAUTION! Always ensure pressure rating for selected hose is equal to or greater than 2000psi/140 bar.
Note: Hose Shortening - Hydraulic hoses typically shorten 2% to 4% of total length when pressurized. When routing
and measuring hose lines ensure extra hose length is added to compensate for the hose shortening under pressure.
Unit
Recommended
Flow Rate
5 10 g/m 37.8 l/m
4
15.1
10
20
30
40
50
60
Flow GPM (l/min)
Furling speed RPM
6
22.6
6
22.6
8
30.2
10
37.8
12
45.3
14
52.9
16
69.4
Furling torque M - LB
2000
4000
6000
8000
16000
10000
Pressure PSI (Bar)
500
(35)
1000
(70)
1500
(105)
2000
(140)
12000
14000
18000