background image

 

MKIV Ocean Unit 3 

29

Problem

Probable Cause

Solution

Sail will not furl or  

is difficult to furl.

Jib halyard is wrapping around headstay because  

angle between mast and and halyard is too shallow

See installation instructions regarding optimal halyard angle. It may be necessary  

to mount a halyard restrainer on front of your mast to hold halyard to rear.

Jib halyard is wrapping around the headstay  

because halyard swivel is too low.

See installation instructions regarding optimal halyard swivel height. A wire pendant  

may be needed at head of sail to raise halyard swivel to proper height.

Jib halyard is too tight.

Ease jib halyard.

Foils riding on turnbuckle.

Raise foils. See adjusting turnbuckle on page 21

Foils too high, binding on swage eye.

Lower foils until clear. See adjusting turnbuckle on page 21.

Spare halyard is wrapping in sail as it furls.

Secure spare halyards away from furling headstay by flipping them behind spreaders

Salt or dirt in bearings.

Flush bearings frequently with fresh water and detergent solution.

Furling line tangled in drum.

Overrides are best prevented by using a 7402 ratchet block as the last furling line lead to 

maintain proper drag on line while unfurling.

Stop knot catching.

Make sure knot is a single overhand and is pushed up inside drum.

Sail full of wind.

Luff completely before furling or reefing.

Sail flogging too much.

Release a short length of sheet, pull some furling line and repeat.

Jib sheets are not free.

Free jib sheets.

Foil out of drum assembly.

Reinstall foil in drum assembly and tighten clamp screws.

No wraps of furling line on drum.

Remove sheets. Rotate stay wrapping as much furling line on drum as possible.

Lineguard assembly has slipped down.

Tighten line guard assembly screws securely.

Line through 7402 ratchet backwards.

Rerun line.

Halyard swivel installed upside down.

Remount swivel correctly.

Sail will not unfurl  

or will not unfurl  

completely.

Jib halyard is wrapping around headstay because  

angle between mast and halyard is too shallow.

See installation instructions regarding optimal halyard angle. It may be necessary to  

mount a halyard restrainer on front of your mast to hold halyard to rear.

Jib halyard is wrapping around the headstay  

because the halyard swivel is too low.

See installation instructions regarding optimal 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 tight.

Ease jib halyard.

Spare halyard is wrapping in sail as it furls.

Secure spare halyards away from furling headstay by flipping them behind spreaders

Salt or dirt in bearings.

Flush bearings frequently with fresh water and detergent solution.

Furling line is not free.

Free furling line.

Sail will not furl  

completely.

Insufficient furling line on drum.

Remove sheets. Rotate stay, wrapping as much furling line on drum as possible.

Too much line on drum.

Adjust amount of line on drum or change position of forward lead block to allow line  

to roll evenly on drum.

Spare halyard catching in sail as it furls.

Move halyards away from furling headsail as above.

Headstay rotates in 

jerks or elliptically.

Insufficient tension on headstay.

Tighten headstay and/or backstay to eliminate sag in headstay.

Sail does not stay 

furled.

Sail not furled tightly on stay.

Maintain drag on sheets while furling.

Furling line not secure.

Secure furling line.

Sail will not go up.

Luff tape will not go into groove.

Check luff tape for fraying.
Check luff tape size.

Sail catching at prefeeder.

Flake sail more loosely on deck.

Dirt in groove.

Clean groove.

Sail will not raise  

completely or luff  

will not tension.

Halyard swivel is hitting end stop.

Luff of sail is too long and must be recut.

Angle between halyard and mast is too sharp  

and halyard is pulling too much to the rear.

Halyard must be routed from a point higher on mast. This may require that any halyard 

turning blocks aloft be replaced or sail shortened.

Sail will not  

come down.

Halyard is wrapping on headstay.

Angle between headstay and halyard is too shallow and must be optimized per installation 

instructions.

Halyard swivel off foil.

Sail luff too long or foil is too short or low and must be lengthened or raised.

Ultravoilet cover rolls 

up inside of sail.

Furling line is wrapped on drum in wrong direction.

Remove sheets. Pull line to remove all furling line from drum. Turn stay to rewind line on 

drum in opposite direction. Line guard and cowling alignment may need to be adjusted.

Line jams between guard 

and plastic spool plate.

Line is not led through windows.

Pull line through enclosed window.

Troubleshooting

Warranty 

https://www.harken.com/en/worldwide-limited-professional-customer-warranty/ 

or call, write, email or fax Harken, Inc.,  

Pewaukee, WI USA

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...

Reviews: