MKIV hydraulic unit 3
34
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 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 27
Foils too high, binding on swage eye
Lower foils until clear. See adjusting turnbuckle on page 27
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 with fresh water and lubricate with dry spray lubricant such as McLube
®
lubricant
Sail full of wind
Luff completely before furling or reefing
Sail flogging too much
Release a short length of sheet, furl a small amount and repeat
Foil out of clamp
Reinstall foil in lower unit and tighten clamp screws
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 27
Foils too high, binding on swage eye
Lower foils. See adjusting turnbuckle on page 27
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 with freshwater and lubricate with dry spray lubricant such as McLube
Sail will not furl completely
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
Keep some tension on sheets when furling in light air to get a tight, secure wrap
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
Attach a halyard and downhaul to a small section of luff tape and clean groove by raising
and lowering
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 halyard
turning block 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
Wrong switch used to furl sail
Unroll sail and use other switch to furl. Alternatively, rewire switch.
Once correct, label switch "furl" and the other "unfurl"
Troubleshoot
McLube is a registered trademark of McGee Industries, Inc.
Warranty
www.harken.com/manuals
or call, write, email or fax Harken, Inc.,
Pewaukee, WI USA
