Should You Grease Boat Lift Cables?
Quick answer
Not with a brushed-on coat of grease, but do lubricate them: a light oil or thin penetrating wire rope lubricant, applied to clean, dry cable at the sheaves and drum so it reaches the core, at least once a season. Grease belongs on winch shaft threads, sheave pins and bearings, and nothing at all goes on the brake. The "never grease cables" rule is right about a thick outside coat, which seals a dry, wet core; rope makers use greases too, but only when they are worked into the rope.
On this page
No, not the way most people mean it. Do not brush grease over the outside of a boat lift cable. Do lubricate it: light oil or a thin penetrating wire rope lubricant, worked in where the cable bends over a sheave or the drum, on rinsed, dry cable. Grease goes on winch shaft threads, sheave pins and bearings. Nothing goes on the brake.
Two answers circulate: lift guides say never grease a cable, while wire rope makers recommend greases. Both describe the same rule: the lubricant has to reach the inside of the rope.
- On the cable: light oil or thin penetrating wire rope lubricant, not a brushed-on coat of grease
- How often: at least once a season, more often in salt or brackish water
- Grease goes on: threaded winch shafts, sheave pins and bearings
- Nothing goes on: brake linings, ratchet wheels or brake discs
Safety: Lubricate with the boat off the lift. Never stand under a raised cradle, and stop the lift before a hand or rag goes near a cable, sheave or drum: rope running onto a drum pulls fingers in with it. On powered lifts, lock out power at the breaker before reaching into a winch housing. Dock wiring belongs to a licensed electrician on a GFCI or ELCI protected circuit; see boat lift electrical.
Why a cable needs lubricant at all
A wire rope is a bundle of small wires that slide against each other every time it bends. A 7x19 lift cable has 133 of them. Lubrication Engineers, writing in Machinery Lubrication, gives a rope lubricant two jobs: "to reduce friction as the individual wires move over each other" and "to provide corrosion protection and lubrication in the core and inside wires." The first job applies to stainless as much as galvanized: friction between wires has nothing to do with rust.
Cable leaves the factory lubricated, but not permanently. Chevron's marine bulletin on wire rope says the manufacturing lubricant "does not last": it works out or dries out, so rope must be relubricated. Its figure: "Rope tests show that the service life of a regularly relubricated wire rope is two to three times longer than that of a dry rope." Those were not lift tests, and no lift maker publishes a number, but the direction is not in dispute.
Not every lift cable starts out lubricated. Aircraft Spruce sells 7x19 aircraft cable in both forms, listing one stainless part as "not lubricated (uncoated)" and another as "pre lubricated." If you do not know which you have, assume it needs lubricant from the first season (construction is covered in boat lift cables explained).
Where the two answers come from
"Never grease the cable"
BoatTEST's boat lift maintenance tips (from Great Lakes Scuttlebutt, 2023) say stainless cables "need to be lubricated with penetrating oil or chain and cable fluid," and warn: "Grease can trap moisture in cable strands, so avoid lubricating cables with anything that contains grease." Dutton-Lainson, which makes a hand winch for boat lifts, writes in its CD4500/CD5500 manual that "winch cable will last longer and remain more flexible with occasional application of light oil."
"Rope needs grease"
Chevron's bulletin notes that "many types of greases" are "excellent at lubricating wire ropes, depending on composition and method of application," and recommends a synthetic grease for wire rope relubrication. Lubrication Engineers describes two classes of rope lubricant: penetrating types, whose solvent carries the lubricant into the core and then evaporates, and coating types, which seal the outside. Because "most wire ropes fail from the inside," it recommends penetrating first and coating second.
Which is right
The lift rule is right for a dock with a brush and a can, and Chevron's own bulletin explains why. Painting and swabbing, it says, "rarely penetrate the lubricant down to the core of the rope." The grease it recommends goes in through a high-pressure lubricator, which forces it into the rope. Brushed onto a lift cable, the same grease stays outside, holds water in a wet core, seals the next dose of oil out, and catches grit that grinds wherever the cable meets a sheave.
So the useful rule is not "oil good, grease bad." It is penetrate first, keep the outside thin. Light oil gets inside when a homeowner applies it; thick grease does not.
What goes on each part
The right product on the wrong part does more harm than skipping it. What the manuals reviewed for this page say, part by part:
| Part | Lubricant | What the source says |
|---|---|---|
| Cable | Light oil, penetrating oil, or thin penetrating rope lubricant | Dutton-Lainson: "occasional application of light oil." BoatTEST: penetrating oil or chain and cable fluid, nothing containing grease |
| Threaded winch shaft (hand-wheel lifts) | Grease | Lakeshore Products LSC964: grease the winch shaft annually, because the wheel "must be able to thread and unthread easily in order for the braking mechanism to work properly." Dutton-Lainson: light coat of wheel bearing grease on the drive shaft threads |
| Brake linings, ratchet wheel, brake discs | Nothing | Dutton-Lainson: "Do not grease or oil any of the brake mechanism parts" |
| Roller chains in the winch | Oil, by brush or oil can | Dutton-Lainson: oil each link between pin and bushing. Lake Lifter motor manual: frequently inspect and lubricate winch box chains and bearings |
| Sheave pins and bushings | Water-resistant marine grease | Grease the pin, not the groove; see pulleys and sheaves |
| Enclosed worm gearbox | Only the oil or grease the maker specifies | Never top up with a different type; grades are in what oil goes in a boat lift gearbox |
Some makers never mention cable lubricant: ShoreStation's hoist manual 0004405 asks for a seasonal inspection of pulleys, cables and frame and nothing more.
The brake is the part to protect
Many winches and drives hold the boat with a friction brake, and a lining that picks up drifting spray loses grip. Dutton-Lainson's rule is flat: no grease or oil on any brake part. Its manual also says to check the brake linings, ratchet wheel and hub for "build up or glaze (shiny spots)" and to remove it by rubbing lightly with sandpaper.
- Close the winch housing and apply cable lubricant with a rag or a short, aimed burst, never a fog.
- Grease the threaded winch shaft where the manual says, and wipe off what squeezes out toward the brake.
- If a lift that held fine starts creeping down after you lubricated it, suspect lubricant on the brake first; the diagnosis is in boat lift slipping or not holding.
How to lubricate a lift cable, step by step
- Rinse and clean. Hose off salt and silt; brush off grit and growth. Lubrication Engineers says to clean dirty rope and dry it right away so rust does not start.
- Let it dry. Oil applied over a wet cable sits on the water instead of getting in.
- Inspect while it is clean. Broken wires, kinks, flattening, birdcaging or heavy rust retire the cable; oil only hides them. The criteria are in boat lift cable problems.
- Apply where the rope bends. Lubrication Engineers says the best results come "at a drum or sheave where the rope strands have a tendency to separate slightly due to bending." Run the lift a short way, stop, oil the cable just before a sheave, and repeat along the working length.
- Wipe off the excess. The cable should look damp, not coated.
- Treat the other parts from the table above, keeping the brake dry, then run the empty cradle up and down once and listen.
Worked example: how much cable actually works
A 4-post vertical lift raises its cradle 4 ft. Each corner cable runs from the drum down around a sheave on the cradle and back up to the top beam, which is 2:1 reeving.
- With 2:1 reeving the cable winds in twice as far as the cradle rises: 4 ft x 2 = 8 ft onto the drum per corner on each raise.
- Both legs between drum and dead end shorten by 4 ft, so 4 ft of cable rolls over the cradle sheave on each raise, and it is a different stretch from the 8 ft nearest the drum.
- Per corner: 8 + 4 = about 12 ft of cable that bends every cycle. Four corners: 4 x 12 = about 48 ft on the whole lift.
That 48 ft is where the wires slide against each other, and where the oil has to go. The dead end at the top beam and its termination need a wipe and an inspection, not a soaking. Reeving differs by lift, so trace your own cable path once.
What to buy
Brand names matter less than properties. Chevron's bulletin lists the basic requirements for wire rope lubricants from ISO 4346. In plain terms, a cable lubricant should:
- cover well and penetrate into the core;
- repel and resist water and not emulsify (turn milky) when wet;
- not go brittle over time;
- carry no grit, water or chlorine, and no additives that turn corrosive when water gets in.
In practice: light oil, penetrating oil, chain and cable fluid, or a spray wire rope lubricant that leaves a thin film. If a data sheet lists lab figures, Lubrication Engineers looks for a four-ball weld point (ASTM D2783) above 350 kg and salt spray resistance beyond 60 hours. Over swimming water, use as little as does the job.
How often, by water
No lift maker reviewed here publishes a cable lubrication interval; Chevron says intervals depend on lubricant, storage and use. The nearest firm schedule is Dutton-Lainson's: at least once a year, "more frequently when the winch is exposed to an environment which is particularly dirty or wet."
- Freshwater lake: once a season, at the spring inspection, plus a rinse and wipe before fall storage.
- Brackish or salt water: this is the "particularly dirty or wet" case. Rinse with fresh water often and oil whenever a rinse leaves the working length looking dry; see tidal and saltwater installations.
Do it the same day as the rest of the maintenance checklist. Overdue looks like dull, dry wire on the working length, a creak as the cable crosses a sheave, or rust bleeding from between strands.
What lubrication will not do
Oil does not restore a cable with broken wires or a kink; replace it (see cable replacement). It does not stop galvanic corrosion where stainless and galvanized parts touch, which is a hardware matching problem, and it does not save a cable from a seized sheave grinding a flat into it. Hydraulic and air lifts have no hoist cable, so none of this applies to them.
Frequently asked questions
Can you put grease on boat lift cables?
Not as a brushed-on coat: hand-applied grease stays outside, traps moisture and collects grit. Rope makers use greases only when a pressure lubricator forces them in. A homeowner gets lubricant into the core with light oil or a thin penetrating rope lubricant applied at a sheave or the drum.
Do stainless steel boat lift cables need to be lubricated?
Yes. Stainless resists rust, but lubricant also reduces friction as the wires slide against each other each time the cable bends over a sheave, and that wear happens on any metal. Some stainless 7x19 cable is sold with no lubricant at all.
Should I grease the winch on a manual boat lift?
Grease the threaded winch shaft, which lets the wheel thread on and off to set the brake; Lakeshore Products says to do it yearly. Oil the chains if the winch has them. Never put oil or grease on the brake linings, ratchet wheel or discs: Dutton-Lainson's winch manual says not to grease or oil any brake part.
How often should boat lift cables be lubricated?
At least once a season on a freshwater lake, at the spring inspection, and more often on brackish or salt water, whenever a fresh-water rinse leaves the working length looking dry. Clean, dry and inspect the cable first, and replace it instead of oiling it if you find broken wires, kinks or birdcaging.
Sources and further reading
- Chevron Marine Products, Marine Lubricants Information Bulletin 9: Wire Rope Lubrication, 2019 (ISO 4346 requirements, painting and swabbing vs pressure lubrication, relubricated rope life) (https://www.chevronmarineproducts.com/content/dam/chevron-marine/technical-bulletins-2020/09%20Wire%20Rope%20Technical%20Bulletin.pdf)
- Jeffrey E. Turner and Christopher Barnes, Lubrication Engineers, Inc., "Wire Rope Lubrication Basics," Machinery Lubrication (penetrating and coating lubricants, application at drums and sheaves, cleaning, ASTM D2783 and salt spray figures) (https://www.machinerylubrication.com/Articles/Print/372)
- Dutton-Lainson Company, CD4500/CD5500 Boat Lift Winch owner's manual 206742 (brake parts not to be oiled or greased, light oil on cable, chain oiling, shaft thread grease) (https://www.dutton-lainson.com/assets/pdf/owner-manuals/206742.pdf)
- Lakeshore Products, LSC964 owner's manual (grease winch shaft annually) (https://www.boatliftanddock.com/MediaStorage/Product/Documents/Document/4951_20210111145912494.pdf)
- Midwest Industries (ShoreStation), hoist manual 0004405 rev B, safety maintenance (https://www.boatliftanddock.com/MediaStorage/Product/Documents/Document/3715_20220602120213498.pdf)
- Lake Lifter, AC 120v Direct Drive Boat Lift Motor manual (lubricate winch box chains and bearings) (https://www.boatliftanddock.com/MediaStorage/Product/Documents/Document/5699_20231205111029683.pdf)
- BoatTEST, "Maintenance Tips for Your Boat Lift," Great Lakes Scuttlebutt, August 29, 2023 (https://boattest.com/article/maintenance-tips-your-boat-lift)
- Aircraft Spruce, 7x19 aircraft cable listing 15-06681 (lubricated and non-lubricated versions) (https://www.aircraftspruce.com/catalog/appages/15-06681.php)