Sailboat Wheel Steering Cables and Conduit - Service, Tension and Replacement

At the dock, turn the wheel lock to lock and pay attention. Notchy or gritty feel, a clunk, dead spots, uneven effort from side to side, or more free play than you remember all point to something in this guide. Note it before you take anything apart so you can tell later if it's fixed.

If the steering feels stiff, Edson's troubleshooting advice is to find out where the friction lives before changing parts: disconnect the cables at the quadrant (and the autopilot drive, if fitted) and turn the rudder by hand. A spade rudder should swing easily and a skeg-hung rudder a bit more firmly, but both smoothly. Hard spots at that point mean the rudder bearings, not the cables (see the rudder bearings guide). Then reconnect the autopilot and try again; older hydraulic autopilot rams can add noticeable drag.

Remove the compass or pedestal top cover to reach the chain and sprocket. Open the cockpit lockers or lazarette panels to reach the sheaves, idlers and quadrant. Center the rudder, then lash the wheel (or set the wheel brake) and tie the quadrant or tiller arm so the rudder can't swing while you work. Have a helper below if you can: one person turns the wheel, the other watches.

Turn the battery switches off before you work in the steering compartment. Steering cables often run past battery cables and the engine's starter wiring in the same lockers. An Edson writer describes helping a friend replace an old chain-and-cable set when the steel steering wire touched a cracked spot in a battery cable's insulation: the current was strong enough to weld the two together. While you are in there, look for battery or starter cables resting on or near the steering wire and secure them away from it.

Turn the wheel hard to one side and coat the chain with the chain lubricant your steering maker names, then turn it the other way and do the rest of the chain. SpinSheet ranks Edson's own chain lubricant first, a protective spray such as Boeshield T-9 second, and plain motor oil only as a messy fallback (and not on the wire cables). With the cover off, also grease the steering shaft's needle bearings through their small grease holes, using the grease your maker specifies. While you're there, set the wheel brake and rock the wheel, then push and pull it along the shaft: Edson says the shaft should have essentially no fore-and-aft movement, and that worn or missing snap rings, which are cheap, let the chain run out of line. Roughness or play as the wheel turns points to worn needle bearings. Edson gives them a typical life of about 20 years with good care, and warns that a needle bearing whose plastic cage breaks can jam the wheel.

Down below, run a cotton ball along each cable from the pedestal idler to the quadrant. If it snags, there are broken wire strands and that cable is due for replacement. Look closely where the wire bends around sheaves, where it enters end fittings, and where it's joined to the chain. Rust staining or a cable that looks thinner in one spot are also warnings. Practical Sailor's rule for conduit systems: at the first sign of cracked conduit or corroded wire, replace the whole cable. If the open cables pass the test, dress them with a rag and the lubricant your maker recommends, from the pedestal idler back to the quadrant.

Each sheave should spin freely, with the wire running in the middle of its groove, not rubbing the cheeks or the bracket. Practical Sailor says to check sheaves for corrosion and wear and that the right sheave diameter is about 20 times the wire diameter: a sheave that's too small fatigues the wire fast. Look for metal dust under a sheave, a wobbling sheave, worn axle pins, and cotter pins or clevis pins that are rusted or missing. Make sure every bracket is bolted solidly; a bracket that flexes lets the cable go slack under load. Edson adds two checks: replace any bronze sheave pins you find (it stopped using them decades ago), and look for worn sheave cheeks, a sign of low tension or a misaligned cable. It suggests a few drops of light machine oil on the sheave pins.

Follow the cable with a light. Anything it touches besides its sheaves will wear it: bulkhead edges, the engine controls, hoses, wiring, stored gear in the locker. Practical Sailor found a chafed synthetic (Dyneema) steering cable on a brand-new boat where play in the system let it rub a bulkhead. If you have synthetic steering line instead of wire, check it even more often: it doesn't resist chafe as well as wire.

Conduit (cable inside a plastic-lined tube) needs a different approach:

• Grease: SpinSheet's method is to turn the wheel hard over, grease the exposed cable with the maker's synthetic grease, then turn the wheel so the cable pulls grease into the conduit. Use only what your maker specifies. SpinSheet warns that petroleum-based lubricants attack the conduit's plastic lining. Edson's conduit guidance calls for a Teflon-based lubricant only, applied often (its product notes say monthly), with conduit greasers on long runs. Edson's product page says an in-line greaser belongs in an easy-to-reach straight section, as close to the middle of each conduit run as you can manage, so the grease spreads both ways.
• Exits: check for binding or sticking where the cable leaves the conduit, which Practical Sailor singles out as a trouble spot.
• Route: look for cracks, flattened spots and tight bends. Make sure the conduit is clamped where the maker shows, so it can't move and chafe. Edson's layout rules for its pull-pull conduit say to avoid 90-degree bends, use conduit only for slight changes in height, and turn corners with a sheave-type conduit idler instead; a run that breaks those rules will always feel stiff.
• Inspect the wire itself: Practical Sailor recommends pulling the cable out of the conduit for inspection at least once a year, since you can't see corrosion inside the tube.

Have a helper turn the wheel hard over each way while you watch the quadrant or radial drive. SpinSheet's test: the quadrant should hit the rudder stop before the wheel stops turning, on both sides. If the wheel stops first, the chain is either off center on the sprocket or the stops need moving. Check the quadrant clamp bolts are tight on the rudder post and the stop bumpers aren't crushed or missing. The cable and its end fittings should never be what stops the rudder.

If the rudder hits the stop on one side but not the other, the chain is off center. Following SpinSheet's method: slack the cable tension completely at the tension eyes, lift the chain off the sprocket and move it one link toward the side where the stop doesn't engage, then retest. Repeat a link at a time until both stops engage. Check your maker's sheet; some chains have a marked center link.

Too loose and the cable can jump off a sheave or the quadrant; too tight and the steering gets stiff and everything wears faster. Tighten the tension eyes at the quadrant a few turns on one side, then the same on the other, to keep the chain centered. SpinSheet's check: with the wheel hard over, the slack cable should just barely start to droop. Then lock each tension eye with its second nut so it can't back off. If your maker's sheet gives a different tension method, follow the maker. Recheck tension after the first sail and again during long passages, as Practical Sailor recommends.

If a cable has broken strands, corrosion, kinks or is near the end of its service life, replace it, and replace both cables together. In general:

• Order the right parts. Most makers sell matched chain-and-wire assemblies and conduit kits by pedestal model and boat. Give them the boat make and model and measurements of the old cables; don't guess lengths.
• Photograph and label the routing. Note which side each cable runs and which way it wraps each sheave. Tape a label to each cable end.
• Remove the old cables. With the rudder lashed centered, slack the tension eyes, free the cable ends at the quadrant, and lift the chain off the sprocket from above.
• Route the new ones exactly the same way. Drop the chain over the sprocket centered, lead each wire around its sheaves (or through its conduit), and connect the ends at the quadrant using the end fittings the maker supplies and their instructions. BoatUS points to Edson's video showing the whole process.
• Replace pins and small parts like clevis pins, cotter pins and worn rudder-stop bumpers while you're in there. Then set the tension (step 10) and repeat the stop check (step 8).

While the lockers are open, find the emergency tiller and test-fit it on the rudder post. Practical Sailor found that many boats have deck plates that are hard to open, keys nobody can find, and tillers that don't fit well. Make sure the deck plate opens with a tool you always have aboard, the tiller slides on without tools, and it swings far enough to steer without hitting the pedestal. Show your crew where it lives.

Steer lock to lock at the dock, then take a short sail in light air and make sharp turns both ways under power and sail. Listen for clicks, feel for notches, and recheck tension and fittings when you're back. Log the date, what you lubricated and any parts you replaced in BoatMend.