Harken 1988 User Manual
INSTRUCTIONS
Mastbase Blocks 1988, 1990, 3123, C8508
Over-the-Top Blocks 3002, 3003, 3004, C8322, C8624
N15W24983 Bluemound Rd. • Pewaukee, WI 53072 U.S.A.
Telephone: (262) 691-3320 • Fax: (262) 701-5780
Web: www.harken.com • E-mail: harken@harken.com
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.
Fasteners (FH)
A4 (316) or A2 (18-8)
stainless steel
Size Type Qty
5
/8"
16 mm
5
/8"
16 mm
5
/8"
16 mm
5
/8"
16 mm
5
/8"
16 mm
5
/8"
16 mm
5
/8"
16 mm
5
/8"
16 mm
5
/8"
16 mm
Part
No. Block
1988 Mastbase
1990 Mastbase
3123 Mastbase
C8508 Mastbase
3002 Over the top
single
3003 Over the top
double
3004 Over the top
triple
C8322 Over the top
single
C8624 Over the top
single
Max
Line Ø
3
/8"
10 mm
1
/2"
12 mm
11
/16"
18 mm
3
/4"
19 mm
3
/8"
10 mm
3
/8"
10 mm
3
/8"
10 mm
1
/2"
12 mm
9
/16"
14 mm
Maximum
Working Load
(MWL)
2500 lbs
1136 kg
5000 lbs
2273 kg
11000
4990 kg
15000
6804 kg
2500 lbs
1136 kg
2500 lbs
1136 kg
2500 lbs
1136 kg
2500 lbs
1136 kg
5000 lbs
2272 kg
Breaking Load
(BL)
5000 lbs
2272 kg
10000 lbs
4536 kg
22000 lbs
9980 kg
30000 lbs
13608 kg
5000 lbs
2272 kg
5000 lbs
2272 kg
5000 lbs
2272 kg
5000 lbs
2272 kg
10000 lbs
4536 kg
Purchase
Flathead 3
Flathead 4
Hexhead
Bolt
Hexhead
Bolt
Flathead 2
Flathead 4
Flathead 6
Flathead 2
Flathead 2
2
3
Install 1988,1990, 3123 Mastbase Blocks
Note: Install blocks so sheave is leaning away from mast. “Harken”
will be towards mast. See drawing below.
1. Remove sheave. Remove screw from port side of assembly. Pull
out centerpost from starboard side.
Tip: Don’t worry about losing balls in sheave, they are captive. If
post is stuck, leave screw halfway in and push on screw head to
push post out port side.
2. Mark position of holes. Keep “Harken” towards mast.
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.
Tip: To make sure block is aligned with load, drill forward hole, insert
screw and sheave, run line to deck block and let block center itself.
Remove and drill other hole(s).
3. Mount carrier. Drill holes and screw to deck using sealant, backing
plates, and locknuts. 1988, 1990 – Do not overtighten screws; sheave
will bind. Tip: Slightly bevel top of hole in deck to allow sealant to mass
near top of hole.
4. Installing sheave: Slip post in from starboard side and seat end of shaft
in flat. Use blue Loctite
Mast
®
provided on screw and secure.
Flat in hole
retains post
Port Side: “Harken” must be towards mast.
Install 3002, 3003, 3004 Over-the-Top Blocks
1. Remove sheave(s). Remove phillips screw from left side of assembly
(see diagram below) and pull out center post.
Tip: Don’t worry about losing balls in sheave(s), they are captive. If
post is stuck, leave screw halfway in and push on screw head to push
post out right side.
2. Mark position of holes.
Tip: Insert shaft without sheaves to hold carriers together while marking
holes.
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.
3. Mount carrier(s). Drill holes and screw to deck using sealant and backing
plates.
Tip: Slightly bevel top of hole in deck to allow sealant to mass near top
of hole.
Note: On multiple sheave models, make sure carrier with flat in hole is
placed on left side.
4. Install sheave. Slip post in from right side and seat end of shaft in flat.
Use blue Loctite
®
provided on phillips screw and secure.
Left side (sheave towards left)
Additional information:
www.harken.com/manuals
Loctite® is a registered trademark of Henkel AG & Company KGaA
®
is a registered trademark of Ultra Safety Systems, Inc.
Tef-Gel
Flat in hole to retain post.
Note: C8624 – 3" (75 mm) sheave
version has flat on opposite side so it
is visible with sheave towards right.
Use Blue
Loctite® here
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.
Stainless fasteners which pass through aluminum blocks should be coated with an
antiseize compound such as Tef-Gel®.
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. 4542 01/14
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