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INSTALLATION MANUAL

Specifications, gipsy and chain match, cable sizing, installation, operation, maintenance, troubleshooting and both parts lists (1700–2000 W and 2300–2700 W) for the Lofrans SX3.5 vertical windlass, with its deck and chain-pipe templates.

DocumentLofrans SX3.5 Vertical Windlass Installation & User's Manual
FormatPDF · 22 pages · 3.6 MB
LanguageEnglish
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Installation ManualPDF · 22 p.Deck template (print at 100%)PDF · 1 p.Chain pipe 636312 template (print at 100%)PDF · 1 p.
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Lofrans SX3.5 Vertical Windlass — Installation & User's Manual

Technical Data

1700 W 12 V 1700 W 24 V 2000 W 24 V 2300 W 24 V 2700 W 24 V
Vessel length, heavy duty 55–65 ft 55–65 ft 60–70 ft 60–70 ft 60–70 ft
Vessel length, light duty 60–70 ft 60–70 ft 65–75 ft 65–75 ft 65–75 ft
Maximum linear pull 1700 / 3740 1750 / 3850 1900 / 4180 2000 / 4400 2400 / 5280
Maximum lift load 850 / 1870 875 / 1925 950 / 2090 1000 / 2200 1200 / 2640
Max lift working load 215 / 473 220 / 484 250 / 550 265 / 583 320 / 704
Current at working load 135 A 68 A 90 A 110 A 125 A
Max line speed 32 / 96 32 / 96 30 / 90 30 / 90 32 / 96
Line speed at working load 15 / 45 15 / 45 16 / 48 18 / 54 18 / 54
Net weight with drum 50 / 110 50 / 110 55 / 121 60 / 132 60 / 132
Net weight, low profile 46 / 102 46 / 102 51 / 113 56 / 124 56 / 124

Pairs as printed. The table labels the load rows (lb), the speed rows (ft/min.) and the weight rows (lb), but gives two figures in each cell.

Gipsy Chain supported
10 mm 10 mm ISO, 3/8" G4
10 DIN 766 10 mm DIN 766, 3/8" BBB
12 mm 12 mm ISO; 13 DIN 766; 7/16" G4
13 DIN 764 13 DIN 764
14 mm 14 mm, pitch 42 mm
1/2" HT 1/2" G4
1/2" BBB 1/2" BBB

Electrical System

Model Motor (W) Voltage (V) Contactor (A) Cable 15–25 m Cable 50–75 ft Cable > 25 m Cable > 75 ft
SX3.5 1700 24 70 25 mm² 3 AWG 35 mm² 2 AWG
2000 24 70 25 mm² 3 AWG 35 mm² 2 AWG
2300 24 125 50 mm² 2 AWG 75 mm² 000 AWG
2700 24 125 50 mm² 2 AWG 75 mm² 000 AWG

Cable lengths are the total run, positive plus negative. The cable table has no row for the 1700 W 12 V motor (as printed).

  • Control box (solenoids): in a dry place near the windlass.
  • Circuit breakers: use the Lofrans breakers, chosen for their trip curve rather than a plain rating.
  • Remote control panel: where the operator can see the windlass during the manoeuvre, sealed so the terminals stay dry.
  • The wiring diagram (including the Thetis 1002 hand-held remote) is in the PDF.

Requirements

  • In the box: windlass with motor/gearbox, control box (DC versions), handle, screws.
  • Tools: drill, 10 mm bit for wood and steel, 65 mm hole saw, 10 mm, 13 mm and 17 mm hex keys.
  • Align the windlass precisely with the bow roller; bow roller height must keep the chain inclination below 5 degrees.
  • The deck faces must be parallel; shim the difference if they are not.
  • With all the chain stowed, leave at least 300 mm between the underside of the deck and the top of the heaped chain.
  • Deck thickness: the studs suit 60 to 90 mm (2.36–3.54"); other thicknesses on request.
  • Aluminium boats: insulate the windlass from the deck with a non-conductive gasket (not supplied), and insulate anchor and chain from the hull, including locker and fixings.
  • Lofrans recommends a chain pipe to lead the chain straight into the locker: code 636311 for SX2 & SX3, 636312 for SX3.5, 636313 for SX4, 636314 for SX5.

Fitting

  • Lay the drilling template on deck aligned with the bow; mark and drill. Leave the hole edges sharp but radius the forward edge of the chain hole at 45°.
  • Clean the deck and fit the gasket supplied; set the upper part on deck. Silicone the base if you wish, but never a permanent adhesive.
  • Below deck: grease the main shaft, offer up the gearbox with the motor away from the chain hole, fit washers and nuts to the studs and tighten; wire the motor per the diagram.
  • Models up to 1500 W come with an IP cover that protects the motor from direct water and gives the IP67 rating. It must be fitted for the warranty to be valid.
  • Chain: use calibrated chain matching the gipsy; feed it through the hole and make it fast, wrap it on the gipsy and motor it in, keeping it aligned. Always fit a swivel between chain and anchor.
  • Templates: the SX3.5 deck template and the chain pipe 636312 template (A3, 1:1). Print at 100% and check the dimensions before you drill.

Operation

Lowering

  • Electrically: clutch tight, brake off, chain stoppers off; switch on the safety switch and press DOWN; then switch off and re-engage the stoppers.
  • By gravity: clutch tight, stoppers and brake off, then ease the clutch with the handle. Clockwise brakes the chain (to a full stop), anticlockwise lets it run. Make the chain fast to a strong point.
  • A fully released clutch drops the anchor at high speed and can damage the hood and bow roller: control the speed.
  • Wait for the windlass to stop before reversing direction.

Recovery and Drum

  • Breaker on, clutch tight, brake off, handle removed, stoppers off; press UP until the anchor seats in the bow roller; breaker off and chain on the stopper.
  • Do not recover on the batteries alone: run the engine or generator.
  • If the hydraulic-magnetic breaker trips on overload, reset it and wait some minutes before running again. It does not protect the motor from overheating on long runs.
  • Warping drum: brake on, anchor secured; put the handle in the drum and turn clockwise to release the clutch (drum now independent of the gipsy); three turns clockwise, tail the rope and press UP; make the line fast on a bollard afterwards.
  • Never use the windlass as a mooring point; hold the load on a chain stopper.

Maintenance Programme

Use of the yacht Less than 2 months From 2 up to 6 More than 6 Charter
Every 3 months A – A (as printed) A – B A – B
Every 6 months A – B
Every 12 months A – B – C C C C – D
Every 24 months D D E
Every 36 months D – E E E
  • A – Rinse all surfaces and hidden points with fresh water and a soft cloth or non-abrasive sponge. No chlorine, bleach or acid: they damage the stainless parts and seals. Polish the stainless parts with metal polish.
  • B – Grease the rotating parts with non-conductive yellow marine grease, especially main shaft threads and clutch cones; check for corrosion and stress. Anti-seize on the clutch nut and main shaft thread (635479+630821).
  • C – Check the motor terminals and test the voltage drop.
  • D – Replace all gaskets.
  • E – Remove the windlass from the deck, clean the salt from under the base and re-seal.

Gipsy Service

  • Turn the hand-wheel anticlockwise with the handle and remove it.
  • Slide off the upper clutch cone, gipsy and lower clutch cone.
  • Wash with running water, never a pressure washer, and check for corrosion or stress; reassemble in reverse order, greasing threads and moving parts.

Disconnect power before any maintenance. Skipping the programme voids the warranty.

Troubleshooting

Problem Possible causes Solution
Windlass does not run when a control is operated Protection switch OFF; no voltage; control box, control or motor failure Switch ON; check battery charge and connections; check/replace control box or control; measure motor voltage, if OK clean the brushes, otherwise replace the motor
Chain jams frequently Locker not deep enough for the chain carried; chain does not suit the gipsy; chain not calibrated Fit the windlass over the deepest point of the locker or carry less chain; change the gipsy; replace chain that is out of tolerance
Windlass turns slowly Cable section too small; deck faces not parallel; bad connections; dirty brushes; water in the motor Increase cable section; shim the faces parallel; check connections; clean brushes; replace the motor
Motor runs, shaft does not turn UP or DOWN Worn or broken wormwheel/worm teeth; broken motor spindle (Service) remove the windlass, replace the broken parts and check no fragments got into the oil circuit; replace the motor and check no broken piece is left in the worm bore. Replace gaskets, screws, keys, circlips and oil at the same time
Motor runs, shaft turns UP but not DOWN The emergency mechanism engages: tangled chain in the locker, poor chain (burrs, zinc), chain stowed in a block, worn emergency spring, or stripper fouling the gipsy Fit a swivel joint after the anchor; inspect and free the chain link by link; lower all the chain in deep water and recover it with the windlass; (service) replace the spring; reposition or replace the stripper. The emergency mechanism can be locked only with the owner's authorisation: this removes the emergency function
Motor runs but the drum will not warp Drum used the wrong way, so the emergency mechanism engages Warp with the main shaft turning in the same direction as the gipsy when it recovers chain
Motor and shaft run, gipsy stays still Gipsy not closed on the clutch cones; clutch or gipsy cones deformed Check clutch tightening, measure for deformation, shim if needed and replace damaged parts; replace the clutch and/or gipsy
Shaft runs out of line with the gipsy and/or drum Shaft bent by excessive load Check the windlass is used within its specification; (service) replace the shaft plus worn parts, gaskets, circlips, keys and oil
Oil leak between motor and gearbox Loose motor coupling makes the worm run irregularly and the seal leaks (Service) find why the fixings loosened, check the spindle and worm bore for ovality and repair on the bench; check for oil in the motor; replace gaskets, keys, circlips, screws, oil and worn parts
Shaft and studs too short for the gearbox at installation Wrong deck thickness given when ordering If the keyed shaft engages the gearbox along its full length, adapt the studs; otherwise order a longer shaft
Runs slowly and sometimes trips the breaker Cable section, connections, brushes, water in the motor, faces not parallel, oil loss, motor labouring, or works in one direction only Increase cable section; check connections; clean brushes; replace the motor; restore parallel faces; (service) inspect gearbox and motor; check 12/24 V across B2–C and B3–C on the control box with each button pressed, and replace the control box if a relay does not work

Spare Parts

Two lists, headed "X3.5 170W-2000W" (as printed; the motors listed are 1700 W and 2000 W) and "X3.5 2300W-2700W". Item numbers are drawing references; kit letters as printed (A seals, B screws & nuts, C keys, D circlips).

SX3.5 1700 W – 2000 W

Lofrans SX3.5 1700W 2000W exploded view

Item Description Kit
209 Key 6×6×30 Kit C
227 Nut M8 Kit B
250 Hd cap screw M5×8 Kit B
307 Spring washer for M8 screw Kit B
308 Washer for M8 screw Kit B
309 Bearing 6203 –
311 Bearing 51105 –
312 Circlip – 43 DIN 472 Kit D
351 Hd cap screw M6×20 Kit B
368 Pivot –
378 Circlip – 62 DIN 472 Kit D
382 Key – 8×7×160 –
450 Key – 8×7×80 –
453 Bearing 6206 –
507 Brake cover –
534 Gearcase – upper –
535 O-ring 4500 Kit A
536 Seal 45-60-7 Kit A
537 Bearing 16009 –
546 Seal 25-45-10 Kit A
639 Washer Kit B
796 Hd cap screw M10×20 Kit B
830 Seal 30-45-8 Kit A
937 Brake pivot –
938 Knob –
1003 Spiral retaining ring –
1030 Magnet –
1031 Sensor –
1033 Stud M8×105 –
1233 Base –
1238 Key – 8×7×18 –
1281 Seal 30-52-7 Kit A
1282 Clutch nut –
1283 Circlip – 45 DIN 472 Kit D
1284 Drum –
1285 Band brake –
1287 Barbotin guide –
1288 Stripper –
1289 Clutch cone – inner –
1290 Main shaft –
1291 Chain guide –
1317 Worm –
1318 Spacer –
1319 Gearcase – lower –
1321 Electric motor 2000 W 24 V B14 –
2002 Wormwheel –
1320a Electric motor 1700 W 12 V B14 –
1320b Electric motor 1700 W 24 V B14 –
1322a Gipsy chain 10 ISO – 3/8" G40 –
1322b Gipsy chain 3/8" DIN 766 – BBB – 10 DIN 766 –
1322c Gipsy chain 12 ISO – 13 DIN 766 – 1/2" DIN 766 –

SX3.5 2300 W – 2700 W

Lofrans SX3.5 2300W 2700W exploded view

Item Description Kit
226 Washer for M8 screw Kit B
250 Hd cap screw M5×8 Kit B
255 Key – 6×6×25 Kit C
259 Hd cap screw – M8×16 Kit B
260 Spring washer for M8 screw Kit B
361 Seal – 40×50×5 Kit A
368 Pivot –
378 Circlip – 62 DIN 472 Kit D
382 Key – 8×7×160 –
389 Stud M10×140 –
390 Washer for M10 screw Kit B
391 Nut M10 Kit B
392 Hex hd screw – M8×25 Kit B
393 Gearcase – upper –
394 O-ring seal – 4625 Kit A
395 Seal – 50×70×10 Kit A
396 Bearing – 16010 –
412 O-ring seal – 153 Kit A
414 Hex hd screw – M8×30 Kit B
419 Electric motor 2300 W 24 V –
433 Electric motor 2700 W 24 V –
450 Key – 8×7×80 –
453 Bearing 6206 –
507 Brake cover –
675 Spacer –
796 Hd cap screw M10×20 Kit B
812 Worm –
830 Seal 30-45-8 Kit A
937 Brake pivot –
938 Knob –
1003 Spiral retaining ring –
1030 Magnet –
1031 Sensor –
1084 Gearcase – lower –
1086 Flange –
1087 Motor flange DC motor –
1093 Bearing 6002 –
1233 Base –
1238 Key – 8×7×18 –
1241 Wormwheel –
1281 Seal 30-52-7 Kit A
1282 Clutch nut –
1283 Circlip – 45 DIN 472 Kit D
1284 Drum –
1285 Band brake –
1287 Barbotin guide –
1288 Stripper –
1289 Clutch cone – inner –
1290 Main shaft –
1291 Chain guide –
1318 Spacer –
1322a Gipsy chain 10 ISO – 3/8" G40 –
1322b Gipsy chain 3/8" DIN 766 – BBB – 10 DIN 766 –
1322c Gipsy chain 12 ISO – 13 DIN 766 – 1/2" DIN 766 –
1322d Gipsy chain 14 –
632b Bearing 51108 –

Warranty

  • 3 years from purchase by the end user, with the maintenance programme followed.
  • 1 year for electric motors and equipment, electronic controls, hydraulic pumps, valves and actuators, gaskets and seals, and products used on charter boats.
  • Not covered: wrong product choice, use outside the design application, corrosion, UV and wear, skipped maintenance, wrong installation, modifications, removal/transport/installation costs, maintenance by people not authorised by Lofrans.

Need a part that isn't listed? Ask us to source it and quote the part number from the PDF.

Products in this Manual