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I have an old Simpson Lawrence electric windlass. It’s fine at winding in the anchor but has stopped doing the down bit. The one-way needle roller clutch bearing at the top of the motor is in good nick. I understand that this is to hold the anchor when I take my finger off the ‘up’ button. To me that begs the question: given its one-way nature, how does the windlass wind down? All the other bearings are working. All the gears/cogs engage.

I can turn them by hand and the main shaft turns freely. I suppose my real problem is that I don’t understand how the windlass actually works! If anyone could enlighten me I’d be most grateful. I think I know the one he's talking about. Can't remember the name, but it doesn't have a manual clutch and it doesn't motor down.

Rather, it has a clever mechanism which releases an internal clutch when you give it a short burst of 'down' motor, then the chain free-falls out. The clutch is locked up again when you heave in. It's designed to be used remotely from the cockpit of a small motorboat, hence all control being driven by spinning the motor.

Sadly I can't remember the details of how it works or advise on the specific problem, but hopefully someone else will recognise it and advise. Thanks for all the advice. Sorry for not identifying it before: it's a Simpson Lawrence Horizon 900, horizontally mounted.

Yes, in the past the 'down' button worked. It sounded and felt as if it was driving the chain down rather than merely letting it fall. That might have been an illusion, of course! There are no obvious signs of any particular cleverness in its innards.

To me, the big puzzle is the one-way bearing at the top of the electric motor. That acts as a brake when you take your finger off the 'up' button, but I don't understand how the 'down' function works.

Even if the motor goes into reverse, that bearing will stop the shaft from following suit. Thanks for all the advice.

Sorry for not identifying it before: it's a Simpson Lawrence Horizon 900, horizontally mounted. Yes, in the past the 'down' button worked. It sounded and felt as if it was driving the chain down rather than merely letting it fall. That might have been an illusion, of course! There are no obvious signs of any particular cleverness in its innards.

To me, the big puzzle is the one-way bearing at the top of the electric motor. That acts as a brake when you take your finger off the 'up' button, but I don't understand how the 'down' function works. Even if the motor goes into reverse, that bearing will stop the shaft from following suit. You probably have this already, but this is the pdf instruction manual if it is of any help Electrical and mechanical breakdown of installation. Mention was made of the 'free fall' - http://www.lewmar.com/%5Cassets%5Cimg%5Cdataset%5CManual-Horizon_free_600-900.pdf.

If you look at the diagram on page 11 in the manual You can see that there is only two wires going to the windlass, the polarity is switched in the box numbered 1 (left picture, detailed diagram page 12) or 6 (right picture, detailed diagram page 13). Assuming you have an installation similar to the right picture.

The box (6) will have relays inside that give power to the winch when one of the buttons are pressed. Since the winch go one way we can assume that the power supply is OK.

Some possible failure points; -The switch -A relay inside the box (500 SERIES CONTROL BOX) -Cabling between the switch and the control box -Connections You don't give us a clear description of the symptoms. Do you here any sound when pushing down button, click or other sound? Btw: Manual free fall is described on page 16.

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