Harken 7410.11 MKIV Jib Reefing & Furling User Manual

Page 34

MKIV Underdeck Unit 0

Inspect

1) Unit for signs of chafe, wear, or damage.

2) Turnbuckle below drum or inside torque tube for signs of loosening. Check headstay tension for signs of loosening.

3) Rigging components for signs of stress corrosion.

4) Norseman or Sta-Lok

terminal or rod terminal for signs of loosening.

5) All screws on unit to be sure they have not loosened.

6) Foil to make sure that it has not dropped into torque tube. Periodically inspect wire for signs of wear or unraveling.
Replace Line

Use small-diameter, high-strength line at forward end and have a rigger add a cover at the aft end where the line is

handled. Forward diameter

" (5 mm). Aft diameter

" (6 mm).

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 grooves facing down or on an angle so water will run out.
Storage/Transporting

Do not store or transport system with large extensions 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.
Remove Furler From Boat

In order to prevent foils from locking against upper stay terminal when backstay is released, loosen torque tube screws

and lower foil before loosening backstay.

Clean and Lubricate

Keep unit clean. When you wash boat,

flush unit with soap and fresh water.

Occasionally lower sail and flush halyard

swivel with soap and fresh water.
1) To clean drum bearings, squirt a mild

detergent and water solution into the small

gap between the plastic ball and the spool

extension as shown at right. Spin drum

and let soak. Follow with one minute

flushing with hose.
2) If a more thorough cleaning is

required: Taking all precautions to keep

mast secure, disconnect stay. Remove

bridge assembly. Remove ball/spool

assembly. Flip upside down and flush

bearings as above but through the line

opening in the ball/guard.
Clean foils by washing with soap and

water. A scrap of luff tape may be run up

foil to scrub inside the grooves. Spray

foils with McLube

to reduce friction

during sail changes.

Maintenance

Clean/Inspect/Remove Furler

WARNING! Periodically inspect items listed below and any others as necessary. Failure to inspect

can cause an accident.

Clean drum bearings

Remove Bridge Assembly

Remove Ball/Spool Assembly

Clean Halyard Swivel bearings