Winch Inspection and Servicing

Annual Winch Disassembly and Cleaning

Winch service takes about 45 minutes per winch with the right materials ready in advance. The mechanism is simpler than it looks. There are only a few moving parts — the drum, the gear stack, the pawls, the pawl springs, and the top cap — and the service procedure is the same on almost every brand.

Before you start: lay out a clean cloth or paper on which to place parts as you remove them. Winch components are small — pawls and pawl springs in particular — and they will roll off any surface that isn't completely flat and confined. Have a small container for each layer of the disassembly to keep parts organized.

Disassembly sequence (standard self-tailing winch):

1. Remove the self-tailing arm (usually lifts off) and set aside.

2. Remove the top cap — typically held by a single screw or simply lifted after the self-tailing arm is off.

3. Lift the drum straight up off the base. It should come off with gentle upward pressure. Note the orientation.

4. Inside the base, you'll find the gear stack — typically two or three gears of decreasing size — and the pawls and pawl springs at the base of each gear layer. Lift each gear out carefully and note its position. Most winches have a specific orientation for the gears (marked with a dot or asymmetric teeth).

5. Remove the pawls and pawl springs from their recesses. There are typically 2–4 pawls per gear layer. These are the most likely parts to fall and be lost — keep your work area contained.

Cleaning: once disassembled, clean all metal surfaces with a degreaser or isopropyl alcohol and a stiff brush. Remove all old grease and oil from the drum interior, gear teeth, and base casting. Rinse with fresh water or isopropyl alcohol. The surfaces should be clean metal — no black grime, no old grease residue. Pay attention to the inside of the drum and the pawl recesses — these trap the most contamination.

Lubrication: What Goes Where

Winch lubrication is not simply 'grease everything.' Different components need different lubricants, and using the wrong lubricant — or over-lubricating — causes failures. Grease on the pawl springs prevents them from flexing correctly; oil on the gear teeth doesn't stay in place under load.

Winch grease (gear teeth and drum bearing surfaces): apply a thin, even coat of winch-specific grease (Lewmar and Harken both make their own; any quality marine winch grease works) to:

— The bearing surfaces at the base of the drum where it contacts the base casting

— The gear teeth of each gear layer

— The central spindle the gears rotate on

— The drum interior bearing surfaces

Do not apply grease to the pawl recesses themselves. Grease in the pawl recess can hold the pawl in the retracted position, causing the winch to slip rather than engage the load.

Light machine oil (pawl springs only): apply one small drop of light oil to each pawl spring. The spring must flex freely to throw the pawl into engagement under load. Grease is too heavy — it damps the spring and slows response. Oil keeps the spring free-moving without damping its action.

Pawls — no lubricant: the pawl itself needs no lubrication. It engages and disengages from the ratchet surface by moving freely in its recess. Any lubricant on the pawl contact surface or ratchet surface reduces the grip that stops the drum under load.

Anti-seize on the cap screw: if the top cap is retained by a stainless screw into a stainless body, apply a small amount of anti-seize compound to the threads before reinstalling. Stainless-on-stainless threads gall (seize permanently) over time without anti-seize, making the next disassembly very difficult.

Over-greasing: is as damaging as under-greasing. A thick coat of grease on gear teeth builds up mixed with grit and salt into an abrasive compound that accelerates gear wear. Thin, even coats, applied to clean surfaces, are correct.

Reassembly, Testing, and Troubleshooting

Reassembly is the reversal of the disassembly sequence — gears go back in the order they came out, drum goes back on top, cap screws on. But the details matter.

Pawl and spring installation: each pawl sits in a machined recess and is held by its spring. The pawl should fall into its recess and be held gently by the spring — not forced. If a pawl doesn't sit correctly, check its orientation. Most pawls are asymmetric and can only be installed one way. The angled face of the pawl must engage the ratchet teeth correctly — if installed backwards, the pawl will allow the winch to reverse freely rather than holding under load.

Gear orientation: if the gears are marked with dots, arrows, or offset features, reinstall them matching those marks. Even on gear sets that appear symmetric, there is often a designed-in orientation that ensures correct engagement. Reversed gears cause unusual wear patterns and noise.

Test before putting the winch back in service: reinstall the drum and cap without the self-tailing arm first. Insert a winch handle and turn in each direction. In the 'load' direction (clockwise on most winches, verified by the direction you tighten a sheet), the winch should turn with smooth resistance and no clicking or slipping. In the 'free' direction, you should hear the pawl clicking as it rides over the ratchet teeth. If the winch turns freely in both directions, a pawl is installed backwards or missing. If it's stiff in both directions, check for debris or a pawl stuck out of its recess.

Self-tailing arm reassembly: reinstall the self-tailing arm last, aligning it with its mounting features. The arm should snap down firmly — a loose self-tailing arm will jump off under load. Test by loading a line into the self-tailing groove and turning the winch handle under hand pressure. The line should advance smoothly and release cleanly when tension is eased.

Troubleshooting slipping under load: if the winch slips when a loaded sheet is on it, the most common causes are: grease on the pawl surfaces (re-clean and re-service), worn pawl ratchet teeth on the drum interior (inspect and replace the drum or drums — the ratchet teeth are part of the drum casting), or a broken pawl spring that's not holding the pawl in full engagement.