Harken 1988 Instructions

Mastbase Blocks
Over-the-Top Blocks
N15W24983 Bluemound Rd. • Pewaukee, WI 53072 U.S.A.
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.
Part
No. Block
1988 Mastbase
1990 Mastbase
3123 Mastbase
C8508 Mastbase
3192 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
Install 1988,1990, 3123, 3192 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 speci-
fied 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
Port Side: "Harken" must be towards mast.
I N S T R U C T I O N S
Telephone: (262) 691-3320 • Fax: (262) 701-5780
Maximum
Max Working Load
Line Ø
3/8" 2500 lbs
10 mm
5000 lbs
1/2"
12 mm
" 11000 lbs
11/16
18 mm
3/4" 15000 lbs
19 mm
5/8" 13227lbs
16 mm
2500 lbs
3/8"
10 mm
3/8" 2500 lbs
10 mm
2500 lbs
3/8"
10 mm
"
2500 lbs
1/2
12 mm
5000 lbs
9/16"
14 mm
on screw threads and secure.
®
Mast
1988, 1990, 3123, C8508, 3192
3002, 3003, 3004, C8322, C8624
Breaking Load
(MWL)
5000 lbs
1136 kg 2272 kg
10000 lbs
2273 kg 4536 kg
22000 lbs
4990 kg 9980 kg
30000 lbs
6804 kg 13608 kg
26455 lbs
6000 kg 12000 kg
5000 lbs
1136 kg 2272 kg
5000 lbs
1136 kg 2272 kg
5000 lbs
1136 kg 2272 kg
5000 lbs
1136 kg 2272 kg
10000 lbs
2272 kg 4536 kg
Fasteners (FH)
A4 (316) or A2 (18-8)
stainless steel
(BL)
Size
1/4"
6 mm
5/16"
8 mm
5/8"
16 mm
5/8"
16 mm
5/8"
16 mm
1/4"
6 mm
1/4"
6 mm
1/4"
6 mm
5/8"
16 mm
5/8"
16 mm
Purchase
Type Qty
Flathead 3
Flathead 4
Hexhead
2
Bolt
Hexhead
3
Bolt
Hexhead
3
Bolt
Flathead 2
Flathead 4
Flathead 6
Flathead 2
Flathead 2
Flat in hole
retains post