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MKIV Ocean Unit 3 

26

Operation 

Sail: Raise/Storm/Reef

Raise Sail

Choose conditions with little or no wind when raising sail at the dock. 

Have bow of boat pointing into the wind.
 1) 

Note:

 Make sure drum assembly is wrapped with line. Shackle  

 

tack of sail to drum. Install shackle so screw pin head is on same 

 

side as sun cover.

  2)  Secure genoa sheets to clew of sail using bowline knots.  

  3)  Attach genoa halyard to halyard swivel.
  4)  Carefully guide sail into feeder and then into foil groove.
  5)  Attach head or pendant at head of sail to halyard swivel.
  6)  Hoist sail slowly, making sure luff tape does not jam in foil.  

 

IMPORTANT!

 

Forcing sail can cause luff tape to rip.

Tip: New sails are often stiff and may hang up at feeder during  

raising. Do not force sail when it hangs up—lower and remove  

twist. Sails "break in" with use and will become easier to raise.

  7)  Line up front of sail so it is parallel to foil and feeds smoothly when  

 

sail is hoisted.

  8)  Put moderate tension on the halyard and secure.
  9)  Check the top area of the furler for interference from halyards.  

 

See “Check Halyards."

10)  Practice rolling sail in and out at the dock. See “Furl" and “Unroll Sail."
11)  If not sailing right away, make sure sail is furled carefully.  

 

See “Secure Sail."

WARNING! Sail can become uncontrollable when raising in windy conditions, resulting in loss of footing.  

Choose wind conditions to match your experience and ability. If changing sails underway, take all safety  

precautions when working on the foredeck. See www.harken.com/manuals General Warnings and  

Instructions.

Feeder

Tack

Head

 

IMPORTANT! Pay careful attention to 

“Secure Sail" on next page. If leaving the 

boat, you must secure sail to prevent dam-

age if wind increases while you are away.

Furl and Reef

To furl or reef, ease the jib sheets and pull  

furling line.
In very light air, it may be necessary to place some tension  

on jib sheet to insure a tight furl.
In a breeze, you must 

completely

 luff sail by 

totally

 slacking  

jib sheets before furling.

The furling line should pull readily. The amount  

of force required is related to amount of wind,  

but a Unit 3 should never require use of a winch to furl. If the sail will not furl, or if furling requires a great deal of effort, 

there is a problem with system. Consult the Troubleshooting Guide on Page 29. Do not use a winch to force a system to 

turn. If you are certain that the system is operating properly, you may use a winch to make furling easier.

Summary of Contents for MKIV OCEAN Unit 3

Page 1: ...ools 5 Dimensions Sailmaker s Instructions 6 Toggle Deductions Stay Into Foil Options 7 Top Foil Length 8 Short Top Foil 9 Confirm Foil Length 10 Assembly Foils Connectors 11 14 Halyard Swivel and Dru...

Page 2: ...damage or harm caused by not observing the safety requirements and instructions in this manual See limited warranty general warnings and instructions in www harken com en general warnings instructions...

Page 3: ...plate Clevis Pin Size 7413 20 3 4 Jaw jaw toggle w short link plate 3 4 19 1 mm 7413 20 7 8 Jaw jaw toggle w short link plate 7 8 22 2 mm 7513 20 1 Jaw jaw toggle w short link plate 1 25 4 mm 7513 20...

Page 4: ...13 31F 10 7 177 8 mm Connectors HFG1017 1 Connector bushing set Includes 10 H 84186 Bushing connector half top 10 H 84187 Bushing connector half bottom HFG1011 1 Foil screw set Includes 44 HFS1060 Foi...

Page 5: ...igging requires Harken rod adapter stud Toggles Furling line is not included with furling unit Purchase 12 mm 7 16 low stretch polyester double braid line Line length should be equal to the length of...

Page 6: ...he way Do not add to halyard swivel or top terminal dimensions 3 4 19 9 mm Clevis pin Add 16 5 8 to 7 3 4 422 mm to 197 mm 7 8 22 2 mm Clevis pin Add 16 5 8 to 7 3 4 422 mm to 197 mm Note These additi...

Page 7: ...Rod adapter nosepiece for Harken rod adapter stud WARNING Using a threaded nosepiece with only adhesive at the upper rod eye terminal may result in headstay system failure which can cause an accident...

Page 8: ...easurement Length Check G Toggle Distance from Lower Clevis Pin to Crosspin Hole Toggle Part No Type Clevis Pin G Distance 7413 20 3 4 Jaw jaw with short link plate 3 4 19 1 mm 5 42 138 mm 7313 20 7 8...

Page 9: ...above Unit 3 Top foil length from worksheet 5 1 2 11 2 140 38 mm Actual Top Foil 6 1 2 165 mm Do not cut top foil to length from worksheet Cut top foil to 6 1 2 165 mm and shorten trim cap by 1 3 8 3...

Page 10: ...t No halyard deflector 1 25 mm With halyard deflector 2 1 8 54 mm If 7304 Halyard Deflector is used add 1 1 8 29 mm 1 25 mm Confirm foil length by laying foils alongside stay with turn buckle componen...

Page 11: ...ing rat tail file Drill two 1 8 3 mm holes in foil for self tapping screws Mark the location of the trim cap screws at the cut end of the top foil Location 1 25 4 mm down from top of foil and 9 16 14...

Page 12: ...r faster assembly Over a marine eye located on the bottom of the stay From the top if lower terminal is part of turnbuckle Check fit of marine eye before proceeding This will generally work with small...

Page 13: ...used Red Loctite Halyard Deflector Put a drop of red Loctite in screw holes Place connector on wire with hooked side up Red Loctite in screw holes Hooked side of connector Use a hex key wrench to secu...

Page 14: ...ector and mating with four recesses in bottom part of bushing Put a drop of red Loctite into screw holes Red Loctite in screw holes Slide foil completely over bushings and connector Use a hex key wren...

Page 15: ...MKIV Ocean Unit 3 15 Assembly Halyard Swivel Drum Assembly Slide halyard swivel onto foil IMPORTANT Make sure up arrow is up Slide drum assembly onto foil...

Page 16: ...Apply a few drops of red Loctite to threads of nosepiece Screw main threaded stud portion onto bronze nosepiece until flats align with two cotter pin holes in terminal body Tip Turn nosepiece complete...

Page 17: ...own below Connect eye to toggle jaw using special clevis pin Secure using cotter pin If stay length is set use side cutters or needle nose pliers to bend cotter pin to secure turnbuckle Make sure shal...

Page 18: ...le Recess turnbuckle into drum assembly slip link plates over special clevis pin and secure using fasteners Use blue Loctite adhesive on screws Secure to toggle using lock nuts Apply isolator Loctite...

Page 19: ...cknuts Determine height of link plates to provide anchor clearance and cut to length Cut at scribe mark Deburr edges Connect eye to toggle jaw using special clevis pin Secure using cotter pin Toggle F...

Page 20: ...ce system is up on the mast and turnbuckle adjusted Blue Loctite in screw holes Lift foils so top of foils ride about 1 25 mm below upper terminal Slide halyard swivel above feeder Place feeder tabs i...

Page 21: ...o lift and hold it about 1 5 m 5 Raise foils using second halyard and secure Allow room above for turnbuckle take up Adjust turnbuckle Replace used cotter pins and locknuts Lower drum assembly and ins...

Page 22: ...opposite direction Lead line to furling line cleat in cockpit 2670 75 mm Carbo Ratchet Block Install so line is angled as shown Furling Line Cleat Furling line lead changes as amount of furling line...

Page 23: ...here has been a halyard wrap so they can avoid an accident by relying on standing rigging or halyards Inspection must be done while rigger is suspended from a separate crane or mast must be lowered to...

Page 24: ...halyard should be firm but not too tight Tip The luff foil system supports sail along its length so halyard tension is used only to shape sails not to support them Use enough halyard tension to remove...

Page 25: ...not be possible to attach spinnaker halyard to bow pulpit or it may be sucked into jib when furling On some boats the spinnaker halyard lays across headstay and will catch on halyard swivel foils or j...

Page 26: ...t the dock See Furl and Unroll Sail 11 If not sailing right away make sure sail is furled carefully See Secure Sail WARNING Sail can become uncontrollable when raising in windy conditions resulting in...

Page 27: ...ght wind and left loosely secured can be a problem if wind increases IMPORTANT Remove sail from furler if extreme winds are predicted especially if boat is left unattended IMPORTANT Check all points a...

Page 28: ...y 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 instr...

Page 29: ...timal halyard angle Foils riding on turnbuckle Raise foils See adjusting turnbuckle on page 21 Foils too high binding on swage eye Lower foils See adjusting turnbuckle on page 21 Jib halyard is too ti...

Page 30: ...nt de Nemours and Company or its affiliates Loctite is a trademark of Henkel AG Company KGaA 3 7312 21 5 8 7312 21 3 4 8 2 6 8 8 6 2 5 8 7 1 4 7 3 9 5 No Description Order Part No Part No Part No Part...

Page 31: ...MP 128 7 6 7 1 2 3 6 Connector w Bushings and Foil Screws 1 7513 31 4 Connector 1 7513 31F 5 Connector Bushing top half shorter 1 H 84186 6 Connector Bushing bottom longer w hook 1 H 84187 7 Foil Scre...

Page 32: ...it Email info harken it Harken New Zealand Ltd 129 Westhaven Drive Westhaven Auckland 1011 New Zealand Telephone 64 9 303 3744 Fax 64 9 307 7987 Web harken co nz Email harken harken co nz Harken Pols...

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