Service a sailboat winch before the season and at least once more during it — Harken's own baseline, tightened to before every regatta if you race hard. Disassemble, degrease with mineral spirits, diesel, or a commercial degreaser (never gasoline), inspect gears and pawls for wear, then oil the pawls with light oil and grease everything else. Reversing that — grease on the pawls — is the single most common cause of a winch that free-spins under load.
Winch servicing at a glance
| Brand | Recommended interval | Pawl lubricant | Gear / spindle / bearing lubricant |
|---|---|---|---|
| Harken | Before the season + at least once during it; before every regatta if racing hard | Light pawl oil only — never grease | Thin, even coat of winch grease, brushed on |
| Lewmar | Regularly through an active season; a full strip, clean and re-lubrication at season start and end | Light machine oil | Light coat of winch/gear grease on gears, spindle and needle bearings |
| Andersen | Every 2 years for normal recreational use; annually for racing, charter, or blue-water use | Very thin film of ANDERSEN Winch Grease (not oil) | Light coat of ANDERSEN Winch Grease only — other marine greases can cause malfunction |
The core routine — dismantle, degrease, inspect, lubricate, reassemble — is identical across every winch on a 30–45 ft cruiser's deck, whether it's a Harken primary, a Lewmar halyard winch, or an Andersen self-tailer. What differs by brand is the interval and, more importantly, exactly what goes on the pawls. Get that one detail wrong and a perfectly good winch can start slipping or free-spinning under load.
This guide works from the manufacturers' own published service instructions — Harken's technical support article, Lewmar's service literature, and Andersen's official product manual — so every step and interval below is sourced, not guessed.
What do you need before you start?
Lay out the right tools first: a screwdriver or Allen wrench set for your specific winch (top-cap or handle-socket screw, depending on brand), needle-nose pliers, a small brush, a container of mineral spirits, diesel, or a commercial degreaser for cleaning, and the correct winch grease and pawl oil for your brand. Get the exploded diagram for your exact model from the manufacturer first — Harken includes one in every winch manual, and doing this without a diagram invites reassembly mistakes.
Surround the winch with towels to protect the deck and catch dropped parts, and if you're near the rail, drape a towel over the lifelines too. Work methodically: lift the drum slowly, since the main bearings inside it are the parts most likely to fall out unnoticed, and lay every part down in the order you removed it.
How do you clean and inspect a winch safely?
Place all the metal parts in a tub of solvent — mineral spirits, diesel fuel, or a commercial degreaser all work. Harken is explicit on one point: never use gasoline, which can damage plastic components in the winch. Scrub off every trace of old grease, salt, and grime with a brush, paying particular attention to the pawl pockets, where hardened grease is the most common cause of a sticking or slow-ratcheting winch.
With the parts clean, inspect them one by one. Look for bent or chipped teeth on the gears — including the teeth machined into the inside of the drum — and confirm the bearings are intact and roll smoothly. Check the pawls and their tiny springs for wear or weak tension; these are the cheapest parts in the winch and the most likely to cause a failure, so replace anything questionable rather than reuse it.
Why does grease on the pawls ruin a winch?
This is the mistake behind most "sluggish" or free-spinning winches. Harken's own service guidance is blunt about it: do not grease the pawls and springs, because grease's viscosity can slow or stop their snapping action — which can leave the drum spinning freely under load, a real safety issue on a loaded sheet or halyard. Lewmar's service literature makes the identical point: pawls get a light machine oil, never grease, because a greased pawl can stick and either ratchet sluggishly or let the drum turn backward under load.
The fix is simple and the same across both brands: a single drop of light pawl oil on each pawl pivot and spring, nothing more. Save the grease for the gear teeth, the spindle, and the bearings, where its job is to resist water and carry load, not to move freely on a spring-loaded part.
How does Andersen's own service guidance differ?
Andersen is the one brand of the three that breaks from the "oil only" rule for pawls — and it's worth knowing before you reach for the wrong tube. Andersen's official product manual calls for gear teeth, the drive shaft, roller bearings, shafts, springs, and bushings to be lightly greased on reassembly, and specifies that the pawls themselves get only a very thin film of ANDERSEN Winch Grease, not oil, so they can still move freely. Andersen also states plainly that other greases — including some products labeled "marine grease" — may not be suitable and can cause the winch to malfunction, so the brand's own grease is not interchangeable with a generic tub from another manufacturer.
Service intervals differ too: Andersen recommends a full clean, grease, and inspection of all moving parts every two years for normal recreational use, stepping up to once a year for winches that see racing, chartering, or blue-water sailing. Pawl arm springs are replaced every second year regardless of apparent condition, since they're inexpensive and a failed spring can take the winch out of service mid-maneuver.
How do you reassemble a winch correctly?
Reassembly is the cleaning and inspection process in reverse, lubricating as you go. Squeeze grease into a small container and apply it with a brush to the teeth of each gear, the shaft each gear sits on, and any bearings if the winch is large enough to have them. Oil the pawls with a single drop each, and grease the handle socket where it contacts a bronze housing. On winches with a thrust bearing under the drum, leave that section alone unless it's actually dry — opening it unnecessarily risks scattering a row of loose ball bearings.
Once the winch is closed up, test it by hand before it goes back into service: spin the drum, fit a handle, and wind it in both directions to confirm the ratchet engages cleanly and nothing binds.
Common mistakes when servicing a winch
The most common failure we see on the rigging bench is grease on the pawls — often from someone who ran out of pawl oil and used "just a little" gear grease instead, not realizing it would stop the pawls from snapping cleanly. The second is skipping the inspection step and reassembling a winch with a weak or corroded pawl spring still in place, because replacement springs are cheap and the labor to strip the winch again is not. The third is mixing lubricant brands — using a generic marine grease in an Andersen winch, for instance, when Andersen specifically warns that non-Andersen greases can cause malfunction.
Which should I choose: DIY or a rigger?
A healthy winch that's been serviced on schedule is a straightforward DIY job with the manufacturer's own diagram in hand — none of the three brands above require special tools beyond a screwdriver, an Allen key, and patience with small parts. If a winch has been neglected for several seasons, shows corrosion inside the drum, or turns in both directions under load (a sign of a seriously worn or jammed pawl), have a rigger inspect it before you sail; a winch that free-spins under a loaded sheet is a safety issue, not just a maintenance one.
Frequently asked questions
How often should I service my sailboat's winches?
At minimum, before the season starts and again at least once during it, per Harken's own guidance — more often if you race hard or sail mostly in salt water. Andersen's published interval is longer for light recreational use (every two years) but drops to annually under racing, charter, or blue-water conditions.
Can I use the same grease on every winch on my boat?
Not necessarily. Harken and Lewmar both lubricate gears and bearings with a general winch grease, but Andersen specifically requires ANDERSEN Winch Grease and warns that other marine greases, including some sold as "marine grease," may not be compatible and can cause the winch to malfunction.
Why is my winch turning in both directions or spinning freely?
That's a classic sign of a pawl problem — either grease has gotten onto the pawls and is preventing them from snapping into the drum's teeth, or a pawl spring has weakened or broken. Strip the winch, clean the pawl pockets thoroughly, and replace the pawl springs; they're inexpensive and should be swapped at every service regardless of how they look.
Do I need to remove the winch from the deck to service it?
No. All three brands are designed to be serviced in place — the drum, gears, and pawls come out from the top without unbolting the base from the deck.
What should I do if I can't find an exploded diagram for my winch?
Contact the manufacturer directly with your model or serial number; Harken, Lewmar, and Andersen all publish model-specific service diagrams, and Harken includes them with every winch manual. Working from a diagram — or from photos you take during disassembly — is what keeps reassembly from turning into guesswork.