28
MKIV Ocean Unit 1
Inspect
Inspect unit for signs of chafe, wear, or damage.
Inspect clevis and cotter pins below and inside drum assembly for
signs of loosening. Check headstay tension for signs of loosening.
Inspect swage fitting and lower toggle for signs of stress
corrosion.
Inspect Norseman or Sta-Lok
®
terminal or rod terminal for
signs of loosening.
Inspect all screws on unit to be sure they have not loosened.
Inspect foil to make sure that it has not dropped into drum
assembly. Periodically inspect wire for signs of wear or unraveling.
Replace Line
Use Harken supplied line or source a good quality line with good wear characteristics. Use 9/32" (7 mm) line with
break strength exceeding 2500 lbs (1130 kg). Smaller boats or smaller sails may allow 5/16" (8 mm) line. If a larger
diameter line is desired, consult with a rigger about using tapered line with a high strength core and cover removed
in forward part of line.
Storage – Mast Down
In areas where it freezes, do not store system where water can accumulate in foils. When water freezes it will rupture
aluminum. Store foils under cover, with sail groove facing down or on an angle so water will run out.
Storage/Transporting
Do not store or transport system with drum assembly extending beyond mast. Remove masthead clevis pin and shift
furler up so drum assembly can be strapped securely to mast. Some people remove drum assembly and halyard swivel
for storage and transport.
After Storage or Transport
After storing or transporting unit, clean thoroughly including ball bearings. See instructions above.
Loosen Foil Clamp Before Slacking Backstay
In order to prevent foils from locking against upper stay terminal when backstay is released, loosen foil clamp screws and
lower foil before loosening backstay.
WARNING! Periodically inspect items listed
below and any others as necessary. Failure
to inspect can cause an accident.
Clean
Keep unit clean. When you wash boat, flush unit with
soap and fresh water. Occasionally lower sail and flush
halyard swivel bearings by squirting soap and fresh water
solution into space indicated at left. This will flush both
upper and lower races of balls.
At least twice a year clean the unit more
thoroughly by removing line (first note direction of spool)
and flushing bearings with soap and fresh water.
Clean foils by washing with soap and water.
To clean foil sail grooves, use the halyard and rig a
downhaul to run a scrap of luff tape up and down the foil
groove.
STA-LOK is a registered trademark of STA-LOK Terminals Ltd.
Soap and fresh
water solution
Access to
bearings
Maintenance
Clean/Inspect/Replace Line/Storage/Remove Furler
