Harken 3220 User Manual

INSTRUCTION SHEET

Black Magic Footblocks

Tel: [phone], Fax: [phone] • Web: www.harken.com, Email: [e-mail]

Block load increases when the line turns at a greater angle. Block loads
double when the line turns 180 degrees. See example below. Select blocks
carefully.

5000 lb

(2268kg)

3800 lb

(1723kg)

Angle of

deflection Load factor

30° 52% 90° 141% 150° 193%
45° 76% 105° 159% 160° 197%
60° 100% 120° 173% 180° 200%
75° 122% 135° 185% — —

N15W24983 Bluemound Rd., Pewaukee, WI 53072-4974 USA

WARNING! Strictly follow all instructions to avoid an accident,
damage to your vessel, personal injury or death.
See www.harken.com/manuals for additional safety information.

Block Loading vs Angle of Deflection

7000 lb

(3175kg)

5000 lb

(2268kg)

Example shows single
footblock with a sheet
load of 5000 lb (2268kg)

5000 lb

(2268kg)

5000 lb

(2268kg)

Angle of

deflection Load factor

8650 lb

(3923kg)

10000 lb
(4535kg)

5000 lb

(2268kg)

5000 lb

(2268kg)

Angle of

deflection Load factor

5000 lb

(2268kg)

5000 lb

(2268kg)

Installing Block

Make sure block bisects the angle as shown in block loading images on first
page. Take block apart, secure base to deck and assemble block per diagram.

WARNING! You must mount to solid deck construction using
specified fasteners in all mounting holes and nuts, washers
or backing plates to achieve correct maximum working load
to avoid a failure leading to an accident.

Loctite® is a registered trademark of Henkel AG & Company KGaA

Maintenance

Keep your equipment clean and free-running by frequently flushing with fresh water.
Periodically clean with mild detergent and water solution. Spin sheaves to distribute
soap solution evenly. Occasionally disassemble and clean rollers and balls with
detergent and water solution. Assemble using Blue Loctite® on screws.

IMPORTANT! Exposure to some teak cleaners and other caustic solutions can
result in discoloration of part and is not covered under the Harken warranty.

Warranty

For additional safety, maintenance and warranty information see www.harken.com/
manuals or the Harken® catalog.

Printed in USA 4546/10-13