MKIV hydraulic unit 3
7
1
2
3 4 5
6 7 8
10
20
30
40
50
60
70
Flow GPM (l/min)
Furling speed RPM
Furling torque in - lb (n - m)
500
57
1000
113
1500
170
2000
226
3000
339
2500
282
500 1000
1500
2000
Pressure PSI (bar)
Furler power requirements
The furling unit and hydraulic tensioning
cylinder will work with all current Harken
hydraulic power plants.
Unit
Recommended
flow rate
3
4 g/m 15 l/m
3.8 7.6 11.4 15.1 18.9 22.7 26.5 30.3
35
70
105
140
Maximum operating pressure
Set relief valve on power plant at 140 bar or 2000 PSI. Harken powerpacks 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.
IMPORTANT! The only parts of furler to be disassembled by installer are the torque tube clamp and toggle hous-
ing. All other work should be performed by factory-authorized personnel. Work performed by unauthorized per-
sonnel may void the Harken limited warranty.
Hose and fitting selection recommendation
Hose type
- SAE 100 R8 hose. Alternatively SAE 100 R2 may be used.
Hose size
- Use -6 hose (3/8" ID). Long runs may require larger hoses.
Hose end fitting, furler end
- Female swivel hose end to mate with adapter.
Note: See
hydraulic connection to furling unit
, next page.
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. They 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 2000 psi/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.
Preassembly
Hydraulic System
