Harken 20 STA Manual

Radial Winch 20 ST
Installation and Maintenance Manual
MRW-03

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Radial Winch 20 ST
Installation and Maintenance Manual
Index
Introduction 3
Technical characteristics 3
Weights 3
Maximum working load 3
Outline 3
Installation 4
Procedure 1 5
Procedure 2 6
Installation procedure 8
Positioning the self-tailing arm 9
Maintenance 9
Washing 9
Maintenance table 9
Disassembly procedure 9
Exploded view with maintenance products 12
Assembly 13
Harken®limited worldwide warranty 14
Ordering spare parts 14
Exploded view 15
Parts List 19
Radial Winch 20 STA 19
Radial Winch 20 STC 20
Radial Winch 20 STCW 21
Radial Winch 20 STBBB 22
Radial Winch 20 STCCC 23

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Radial Winch 20 ST
Installation and Maintenance Manual
Introduction - Technical characteristics - Outline
Introduction
This manual gives technical information on winch installation and maintenance, including
disassembling and reassembling.
This information is DESTINED EXCLUSIVELY for specialised personnel or expert users.
Installation, disassembling and reassembling of the winch by personnel who are not experts may
cause serious damage to users and those in the vicinity of the winch.
Harken®accepts no responsibility for defective installation or reassembly of its winches.
In case of doubt the Harken®Tech Service is at your disposal at techser[email protected]
This Manual is available only in English. If you do not fully understand the English language, do
not carry out the operations described in this Manual.
Technical characteristics
Power ratio Gear ratio
1st speed 19,20 : 1 2,76 : 1
The theoretical power ratio does not take friction into account.
Weights
ST A version ST C/CW versions ST BBB/CCC versions
Weight (Kg) 2,4 3,4 3,9
Versions: A = drum in anodised aluminium; C = drum in chrome bronze; CW = chrome/white;
BBB = all bronze; CCC = All-Chrome bronze
Maximum working load
WARNING!
The maximum working load (MWL) for the 20 ST Radial Winch is 550 Kg (1213 lb)
Subjecting the winch to loads above the maximum working load can cause the winch to fail or
pull off the deck suddenly and unexpectedly during high loads causing severe injury or death.
Outline
Winch 20 ST Winch 20 PT
148
Ø73,5
Ø137
61
128
Ø73,5
Ø137
61
Line entry height

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Radial Winch 20 ST
Installation and Maintenance Manual
Installation
The winch must be installed on a at area of the deck, reinforced if necessary to bear a load equal
to at least twice the maximum working load of the winch.
It is the installer's responsibility to carry out all structural tests needed to ensure that the deck can
bear the load.
Harken®does not supply the screws needed to install the winch since these may vary depending
on the deck on which it is to be installed.
It is the installer's responsibility to choose the correct screws taking account of the loads they will
have to bear.
Harken®assumes no responsibility for incorrect installation of its winches or for an incorrect choice
of mounting screws.
DANGER!
Incorrect installation of the winch may cause severe injury or death. Consult the yard that built
the boat in the case of doubt over the correct positioning of the winch.
WARNING!
Failure to use the correct number and type of mounting fasteners or failure to ensure the
correct deck strength can result in the winch pulling off the deck suddenly and unexpectedly
during high loads causing severe injury or death.
WARNING!
Verify the entry angle of the sheet. This must be 8° with tolerance of
±2°, to avoid sheet overrides and damaging the winch or making the
winch inoperable leading to loss of control of the boat which can lead to
severe injury or death.
WARNING!
Mount the winch on the deck so that the drive gear is positioned where
the sheet enters the winch drum.
Incorrect position of drive gear can weaken winch leading to failure
which can cause an accident leading to severe injury or death.
NOTICE
For winch STA, STC and STCW versions only
you can nd the icon on the skirt to identify the drive
gear position.
Once you have chosen the correct mounting position for the winch on the deck proceed with
installation.
Installation
drive gear
SHEET
8°

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Radial Winch 20 ST
Installation and Maintenance Manual
The winch can be installed following one of the two procedures below (Procedure1 or Procedure 2):
Procedure 1
To install the winch you must remove the drum and use bolts as described ahead.
Tools needed One medium at-bladed screwdriver
To identify the various parts, refer to the exploded view at the end of this Manual.
Torque to apply when assembling
1. Unscrew the central screw ( 2Nm/18 in-lb) 2. Slide off the assy socket n°20 and the cover
n°19
3. Unscrew the three screws n°18
(4Nm/35 in-lb)
4. Remove the self-tailing arm n°17 by rotating
and lifting it.

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Radial Winch 20 ST
Installation and Maintenance Manual
Procedure 2 (not pertinent for ST BBB/CCC versions)
To install, you must remove the winch skirt and use hexagonal headed bolts.
Tools needed One medium at-bladed screwdriver
To identify the various parts, refer to the exploded view at the end of this Manual.
2. Take off the skirt n°2
1. Remove the skirt n°2 with the help of the
screwdriver placed as shown by the
symbol
5. Lift off the drum n°13
Winch STA, STC and STCW versions:
Install the winch on the deck in the position you have chosen, keeping in mind
the limits described on page 4 and using socket head (SH) bolts.
Winch STBBB and STCCC versions:
Install the winch on the deck in the position you have chosen, keeping in mind
the limits described on page 4 and using socket head (SH) bolts or hexagonal
headed bolts (HH).

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Radial Winch 20 ST
Installation and Maintenance Manual
NOTICE
Make sure the skirt is correctly clipped on to the base of the winch.
Install the winch on the deck in the position you have chosen, keeping in mind the limits described
on page 4 and using hexagonal headed bolts (HH).
(See paragraph on installation)
4. Reposition the skirt n°2 in its housing 5. Press down the skirt to position it correctly
3. Position the 5 M6 hexagonal headed bolts
in their holes

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Radial Winch 20 ST
Installation and Maintenance Manual
B. Remove the winch and drill the ve 6.2 mm diameter holes.
C. Bolt the base of the winch to the deck using ve M6 bolts (not supplied by Harken®) as
described at Procedure 1 or Procedure 2, correctly chosen for the thickness and type of the
boat deck. Consult the yard that built the boat in case of doubt.
WARNING!
To install the winch on the deck, use only bolts in A4 stainless steel (DIN 267 part11).
Bolts made of other materials may not have sufficient strength or may corrode which can result
in winch pulling off deck suddenly and unexpectedly during high loads causing severe injury or
death.
NOTICE
To mount winches on the deck, do not use countersunk bolts.
D. Fill the mounting holes with a suitable marine sealant.
E. Remove the excess adhesive/sealant from the holes and base drainage channels
F. Reassemble the winch following the steps in Procedure 1 or Procedure 2 in the reverse
order, and apply the products indicated in the section on maintenance.
Installation procedure
Carry out Procedure 1 or Procedure 2, then install the winch on the deck in the chosen
position.
A. Position the base of the winch on the deck and mark the position of the holes or use the
drilling cut-out template at the point where you have decided to place the winch.
Below is a reduced scale diagram.
The drilling cut out template is available on the Harken®website, www.harken.com
Ø110
50°
60°
60°
70° 60°
60°
Winch outside Ø137
final pinion
position
Ø6
n°5

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Radial Winch 20 ST
Installation and Maintenance Manual
NOTICE
Before closing the winch, make sure the holes and drainage channels in the base of the winch
are not obstructed.
Positioning the self-tailing arm
Position the self-tailing arm so that the line leaving the winch is led into the cockpit.
Maintenance
Washing
Winches must be washed frequently with fresh water, and in any case after each use.
Do not allow teak cleaning products or other cleaners containing caustic solutions to come into
contact with winches and especially anodised, chrome plated or plastic parts.
Do not use solvents, polishes or abrasive pastes on the logos or stickers on the winches. Do not
use polishes or abrasive pastes on anodised, chrome plated or plastics surfaces.
Make sure that the holes and drainage channels in the base of the winch are not obstructed so
that water does not collect.
Maintenance table
Winches must be visually inspected at the beginning and end of every season of sailing or racing.
In addition they must be completely overhauled, cleaned and lubricated at least every 12 months.
After an inspection, replace worn or damaged components. Do not replace or modify any part of
the winch with a part that is not original.
WARNING!
Periodic maintenance must be carried out regularly. Lack of adequate maintenance shortens
the life of the winch, can cause serious injury and also invalidate the winch warranty.
Installation and maintenance of winches must be carried out exclusively by specialized
personnel.
In the case of doubt contact Harken®Tech Service at [e-mail]
Disassembly procedure
Tools needed
One medium at-bladed screwdriver
A number ve hex key
Rags
To identify the various parts refer to the exploded view at the end of this Manual.
Torque to be applied in assembly phase
Maintenance

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Radial Winch 20 ST
Installation and Maintenance Manual
Carry out Procedure 1 as shown in the paragraph on winch installation and then do the following:
6. Completely unscrew the three screws n°18
8. Slide out the central shaft n°7
10. Slide off gear n°3
7. Remove the self-tailing arm support n°12
and slide out the bushing
9. Remove the pin n°6
11. Slide off gear n°11