Jib Furling Service and Maintenance | Harken Marine
Quick Service HEADSAIL HANDLING Jib Reefing & Furling Systems SERVICE AT REGULAR INTERVALS Flush unit with soap and fresh water. Occasionally lower sail and flush halyard swivel with soap and fresh water. At least twice a year unit should be cleaned more thoroughly by removing line (first note direction of spool) and flushing bearings with soap and fresh water. See manuals online for detailed troubleshooting tips and procedures at www.harken.com/manuals. Inspect carefully for: Halyard wrapping: Correct the halyard angle with a wire pendant or halyard restrainer so halyard is at an 810° 8- to 10-degree angle from foil. Alternatively use a halyard deflector. Line jumps above guard on MKIII or MKIV and jams system: Make sure line is led through one of two enclosed windows in guard. Hard to furl or unfurl: · Too little headstay tension. Increase headstay tension by accessing and adjusting the turnbuckle. · Too much halyard tension. Try easing halyard. Remember, tensioning backstay tightens halyard. Set backstay, then tension halyard. · Line scrapes on line guard: There may be too much line on the spool, or an incorrect lead block angle is spooling line onto the bottom of the spool. Make sure the lead angle is 90-degrees perpendicular to headstay, then if necessary untie and adjust the sheets to reduce the amount of line. · Line is wound on spool too loosely or has overrides: Be sure the last block in lead system is a ratchet block to spool tightly. · Leads for furling line creating too much friction: Use ball bearing blocks. · Furling line runs backwards through ratchet block: Re-rig block in correct direction. · Stopper knot is catching: MKI: Deadend with an overhand knot outside the drum. MKII, MKIII, MKIV: check that it runs through the correct hole, or reduce knot size. · Foils are scraping at top or bottom: Foil may be too high or too low. Make sure foil hasn't dropped into torque tube and started riding on turnbuckle. · Tensioning halyard makes it hard to furl: Missing top bushing, or swivel may be installed upside down. Sail won't furl/unfurl completely: · Too much/too little line on the drum: Untie sheets, turn furled unit to reduce/add line to drum, retie. · Line spools on bottom of drum and won't unfurl completely: Adjust forward lead block so line exits drum at 90 degrees to headstay from middle of spool. Find specific information including parts list at www.harken.com/manuals. ACCESSORIES AND REPLACEMENT PARTS See manual for replacement component part numbers. Note for ordering parts: Pre-1987 MKI units have different locking collars for swage, Norseman/STA-LOK®, and rod. Furling unit 00AL 0 1 2 3 3.25 Halyard restrainer 944 944 944 945 945 945 Snap shackle 884 884 884 885 -- -- Halyard deflector -- 7301 7302 7303 7304 -- 944 945 7401 7402 7405 7301, 7302 884 7303, 7304 885 STA-LOK® is a registered trademark of STA-LOK Terminals Ltd. 7403 7404 FURLING LEAD BLOCK KITS Harken recommends equipping every system with Carbo® lead blocks for safe furling from the cockpit. The 7404 lead block kit provides a complete system for most boats. Fits 25 mm (1") stanchions. 7402 Ratchet: Maintains tension when spooling for smooth furling. 7403 Outboard assembly: Keeps furling line outboard of stanchion. 7401 40 mm block: Inboard lead on the bow pulpit. Part No. Description Sheave Ø in mm Max line Maximum Ø working load in mm lb kg 7401 40 mm Carbo lead block assembly 19/16 40 3/8 10 485 220 7402 57 mm Carbo ratchet lead block assembly 21/4 57 3/8 10 500 227 7403 29 mm Outboard lead block assembly 11/8 29 3/8 10 -- -- 7404 Lead block kit* Includes 3 x 7403/1 x 7401/1 x 7402/1 cleat 7405 40 mm Carbo double lead block assembly 19/16 40 3/8 10 485 220 *Max line Ø: 10 mm (3/8") Quick Service HEADSAIL HANDLING Jib Reefing & Furling Systems FAMILY IDENTIFICATION Use to help order replacement parts. Note: Some parts on older furlers may not be available. Find specific information including parts list at www.harken.com/manuals. Family Line guard Spool material & color Torque tube Screws near torque tube base Unit Number/Date of manufacture MKI Stainless cup, Gray-anodized Straight cylinder Yes one opening aluminum Size and date stamped on top of spool Stainless curved MKII plate secured to gray aluminum single line opening Gray plastic Tapered No unit size marked. See chart below. Yes Date on hub of halyard swivel and lower unit (must remove split drum) MKIII Black aluminum line guard with 4 openings, 2 for line. Black plastic Tapered No unit size marked. See chart below. Yes Date on hub of halyard swivel and lower unit (must remove split drum) 00AL Black aluminum line guard with 4 openings, 2 for line. Black plastic Tapered top No unit size marked. See chart below. No Date on halyard swivel and lower unit (must remove drum) MKIV Black aluminum line guard with 4 openings, 2 for line. Black plastic Tapered top No Size on label. No date marked. Black aluminum Cruising* line guard with Black plastic Straight cylinder No Size on label. 4 openings, 2 No date marked. for line. ESP* Stainless steel line guards with 5 openings, 1 for line. Black plastic None Hub extension connects to foils using set screws Measure drum Ø *Cruising and ESP furler foils have a single sail groove. All other families have two. SIZE IDENTIFICATION (MKI, MKII, MKIII, ESP) MKIV and Cruising furlers have unit size printed on label. For other models use drum diameter (measure across top of drum), clevis pin diameter, and torque tube length. Torque tube length Drum Ø Unit size 00AL 0 1 1.5 2 2.5 3 3.25 ESP 0 ESP 1 ESP 2 ESP 3 Drum Ø in mm 5 3/4 146 5 13/16 147 7 7/16 188 7 7/16 188 9 1/2 241 9 1/2 241 12 305 12 305 6 1/2 166 8 200 9 7/8 250 11 3/4 298 Clevis pin Ø in mm 1/4, 5/16, 3/8, 7/16 6, 8, 9.5, 11.1 5/16, 3/8, 7/16 8, 9.5, 11.1 1/2 12.7 5/8 15.9 5/8 15.9 3/4 19.1 3/4, 7/8 19.1, 22.2 7/8, 1 22.2, 25.4 5/16, 3/8 8, 9.5 7/16, 1/2 11, 12.7 5/8, 3/4 15.9, 19.1 7/8, 1 22.2, 25.4 Torque tube length in mm 9 1/2 241 5 7/8 150 7 7/16 189 13 330 10 5/16 262 17 1/4 438 13 330 15 381 -- -- -- -- -- -- -- -- Clevis pin ØAdobe PDF Library 15.0 Adobe InDesign 15.0 (Windows)