Harken 70.3 ST E Manual

Installation and Maintenance Manual
MRW-04
Powered Radial Winch
70.3 ST E/HY

2
Radial Winch 70.3 ST E/HY
Installation and Maintenance Manual
Index
Introduction 3
Technical characteristics 3
Performance data 3
Weight 4
Maximum working load 4
Outline 5
Installation 6
Installation procedure 7
Winch installation procedure 9
Positioning the self-tailing arm 10
Motor installation procedure 10
Electric wiring diagrams 11
Hydraulic connections diagram 13
Maintenance 14
Washing 14
Maintenance table 14
Disassembly procedure 14
Exploded view with maintenance products 18
Assembly 19
Harken®limited worldwide warranty 20
Ordering spare parts 20
Exploded view 21
Parts List 25
Radial Winch 70.3 STA 25
Radial Winch 70.3 STC 26
Radial Winch 70.3 STCW 27
Radial Winch 70.3 STBBB 28
Radial Winch 70.3 STCCC 29
Horizontal electric motor 30
Vertical electric motor 31
Hydraulic motor 32

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Radial Winch 70.3 ST E/HY
Installation and Maintenance Manual
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 [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 9,00 : 1 2,30 : 1
2nd speed 22,20 : 1 5,70 : 1
3rd speed 72,00 : 1 18,50 : 1
The theoretical power ratio does not take friction into account.
Performance data
Winch 70.3 ST E (electric)
horizontal motor
12 V (1500 W) 24 V (2000 W)
1st
speed
2nd
speed
3rd
speed
1st
speed
2nd
speed
3rd
speed
line speed (m/min)** 40,0 16,1 5,0 48,1 19,4 5,0
max load (Kg) 350 870 2700 350 870 2700
**Line speed is measured with no load
vertical motor
12 V (1500 W) 24 V (2000 W)
1st
speed
2nd
speed
3rd
speed
1st
speed
2nd
speed
3rd
speed
line speed (m/min)** 45,8 18,5 5,7 55,1 22,2 6,9
max load (Kg) 350 870 2700 350 870 2700
**Line speed is measured with no load
Introduction - Technical characteristics - Outline

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Radial Winch 70.3 ST E/HY
Installation and Maintenance Manual
motor nominal power (W) current absorption at winch
MWL (A)
12 V 24 V 12 V 24 V
winch 70.3 ST E horizontal 1500 2000 280
250
150
140
vertical
Winch 70.3 ST HY (hydraulic)
1st speed 2nd speed 3rd speed
line speed (m/min)* 68,4 27,6 8,5
max load (Kg)*** 350 870 2700
* at 30 l/min oil ow (5,28 Gal/min)
*** at 110 bar at 30 l/min
NOTE
The ratio of the line load - pressure is evaluated at nominal ow rate.
The performance is evaluated measuring the pressure and ow on the motor ports.
The performance data are based on oil with a viscosity of 35mm2/s [165 SUS] and
temperature of 50°C [120°F].
Weight
ST A EH ST C/CW EH ST A EV ST C/CW EV ST A H ST C/CW H
weight (Kg) 23,6 27,4 24,3 28,1 20,3 24,1
ST BBB EH ST CCC EH ST BBB EV ST CCC EV ST BBB H ST CCC H
weight (Kg) 29,0 29,0 29,7 29,7 25,7 25,7
Versions:
A = drum in anodised aluminium
C = drum in chrome bronze
CW = chrome/white
BBB = all bronze
CCC = All-Chrome bronze
EH = horizontal electric winch
EV = vertical electric winch
H = vertical hydraulic winch
Maximum working load
WARNING!
The maximum working load (MWL) for the 70.3 ST Radial Winch is 2700 Kg (5952 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.

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Radial Winch 70.3 ST E/HY
Installation and Maintenance Manual
Outline
Vertical electric motor (12 V / 24 V)
Hydraulic motor
Winch 70.3 ST E/HY Horizontal electric motor (12 V / 24 V)
Ø130
Ø240
264
115
Line entry height
264
Ø130
115
Ø240
181
69
Line entry height
264
115
233
Ø130
Ø240
130
Line entry height
264
Ø130
115
Ø240
394
156
Line entry height

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Radial Winch 70.3 ST E/HY
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.
Once you have chosen the correct mounting position for the winch on the deck proceed with
installation.
After correctly positioning the  nal drive gear with respect to the load, check that the motor,
gearing, electrical wiring and/or hydraulic pipes can be housed below decks. To help  nd the
optimal compromise, remember that, to make the installation of the motor easier, it can be
coupled to the winch in different positions.
Once you have decided the correct mounting position for the winch on the deck and checked the
space available below deck, proceed with the installation.
drive gear
SHEET
8°
Installation

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Radial Winch 70.3 ST E/HY
Installation and Maintenance Manual
Installation procedure
To install the winch you must remove the drum and use Socket Head (SH) bolts.
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. Pull out the disconnect rod n°39 2. Unscrew the central screw ( 2Nm/18 in-lb)
3. Slide off the assy socket n°30 and the cover
n°29
4. Unscrew the three screws n°28
( 4Nm/35 in-lb)
5. Remove the self-tailing arm n°27 by rotating
and lifting it.
6. Lift off the drum n°24
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.

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Radial Winch 70.3 ST E/HY
Installation and Maintenance Manual
11. Remove the drum support n°16
7. Remove the stripper arm housing n°21
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 M8
bolts.
9. Slide out the central shaft n°19 10. Unscrew the 6 hex screws n°17
( 20Nm/177 in-lb)
Follow steps below only to install the winch using hexagonal headed bolts
8. Slide out the assy clutch n°38

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Radial Winch 70.3 ST E/HY
Installation and Maintenance Manual
B. Remove the winch and drill the six 9 mm and a 80 mm diameter holes.
C. Bolt the base of the winch to the deck using six M8 bolts (not supplied by Harken®) 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 sufcient 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 Installation procedure (page 7) in the reverse
order, and apply the products indicated in the section on maintenance.
Winch installation procedure
Carry out Installation procedure 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
Ø205
28°
41°
53,5°
60°
64°
60°
53,5°
Winch outside Ø240
final pinion
position
Ø9
n°6
Ø80 cut out for
powered winches

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Radial Winch 70.3 ST E/HY
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.
Motor installation procedure
WARNING!
Make sure that the power is switched off before installing or carrying out maintenance on
the winch.
Once you have installed the winch on the deck, proceed with motor installation. The motor can be
coupled to the winch in different positions. Check the space available below deck and choose the
suitable position.
Tools needed:
A number  ve hex key
A number six hex key (only for vertical electric motor)
A number ten hex key (only for hydraulic motor)
Two number thirteen wrenches
1. Position the  ange (see Page 12) 2. Tighten six M6 precote coated screws
( 8 Nm/ 71 in-lb)
3. Position the reduction gear and motor 4. Tighten the two screws ( 8 Nm/ 71in-lb).
Be sure to align the  ange.