How to Lubricate a Treadmill: Steps, Schedule and Belt Tension

Knowing how to lubricate a treadmill, and whether yours needs it at all, is the core of treadmill maintenance. This guide is for owners of home treadmills and walking pads who want the steps and intervals manufacturers actually publish rather than guesswork. It covers the lubrication procedure, how often Horizon, Sole, NordicTrack and walking-pad makers say to do it, which lubricant to use and how much, belt tension and tracking, and a simple maintenance schedule.

No affiliate links: this is an educational reference guide. It contains no product recommendations and no affiliate links — just the background you need before spending money. When you are ready to compare specific models, our equipment roundups (linked below) are where the affiliate links live, and they are always disclosed.

Why Treadmills Actually Fail

Most treadmill deaths follow one chain: the belt-to-deck interface dries out, friction rises, and the motor and controller work harder to drag the belt under your feet until one of them overheats. The user experiences this as “the motor died,” but the motor was usually the victim, not the cause.

This is why lubrication — the least glamorous task on this page — is the single highest-payoff habit. Nearly everything else here is either supporting that interface or catching its decline early.

Lubrication: The Habit That Matters Most

Most home treadmills use 100% silicone lubricant applied between belt and deck; typical guidance falls around every three months or a set number of usage hours, but your manual’s number wins. The general procedure: unplug the machine, loosen or lift the belt edge, apply the silicone in lines along each side under the belt, then run the machine slowly for a few minutes to spread it.

Two critical exceptions. Some belts are factory-waxed or “maintenance-free” and must not be silicone-lubricated — the manual states this. And never substitute household oils or WD-40; petroleum products degrade many belts. The quick test for a dry deck: unplug, slide a hand between belt and deck — it should feel slightly slick, not dry and dusty.

Belt Tracking and Tension

A belt that drifts to one side or slips under footstrike is adjusted at the two rear roller bolts. Small turns — a quarter turn at a time, walking speed, observing for a minute between adjustments — are the rule; large adjustments overshoot and can damage the belt edge. Tension is right when you cannot noticeably pause the belt underfoot at slow speed, but it is not guitar-string tight; overtension wears rollers and bearings.

Inspect the belt surface itself every few months: fraying edges, lifting seams, or a glazed, smooth patch underfoot mean the belt is entering its endgame. Replacing a worn belt is routine service; running a machine on one until the deck scores is how a modest repair becomes a write-off.

Ready to compare specific models? This guide stays product-neutral on purpose. When you want the shortlist, see Best Treadmills for Home Use or Best Walking Pads & Under-Desk Treadmills. Those pages carry affiliate links and say so; this one does not.

Dust, Placement, and the Motor Compartment

Treadmill motors ingest whatever surrounds them, and in homes that means carpet fiber, pet hair, and belt dust. A few habits keep the compartment breathing: vacuum around and under the machine weekly, vacuum inside the motor hood every few months (unplugged, using the vacuum — not fingers or metal tools — around components), and avoid deep-pile carpet placement, which both feeds fiber in and blocks the cooling path.

Placement also decides the machine’s electrical life: manuals specify a grounded outlet and warn against makeshift wiring — NordicTrack’s, for example, call for a nominal 120-volt circuit with a surge suppressor. A garage placement adds the humidity and temperature-swing problems covered in our garage planning guide.

Warning Signs Worth Acting On Early

Burning smell: stop immediately — belt friction or motor overheating. Check lubrication and dust first.
Hesitation or surging at constant speed: classic early sign of a dry deck, a worn belt, or a struggling controller.
New squeaks, thumps, or grinding: usually roller bearings or a debris object under the belt; a small fix early, a major repair late.
Error codes: photograph them and check the manual before power-cycling away the evidence.

The pattern in every case: symptoms are easiest to fix at first appearance. A machine that has visibly slowed under load has been asking for maintenance for months.

Repair or Replace?

Belts, decks, and rollers are consumables — replacing them on an otherwise sound machine is normal ownership, and parts availability is a real argument for buying established brands. Controller boards and motors are where the decision gets harder on entry-level machines, since replacing either is a major repair relative to the machine itself.

The honest rule of thumb: a machine with a strong frame warranty and available parts deserves repair; an entry-level machine with a failed motor rarely does. If you are at that decision point, our home treadmill roundup covers what current machines offer at each tier.

How Do You Lubricate a Treadmill, Step by Step?

First, find out what your deck is. Horizon’s help center says to check the owner’s manual for whether the deck is silicone or waxed: waxed decks are maintenance-free and must never get silicone, and Sole says the same of its waxed-deck TT8. If your manual calls for silicone, this is the procedure Horizon and Sole publish:

Unplug it. Switch off, remove the safety key and pull the cord.
Loosen the rear roller bolts, counting turns. Horizon says 10 to 15 counterclockwise turns gives enough slack to lift the belt. Sole says to loosen both sides evenly and count so you can reverse exactly.
Apply under the belt, onto the deck. Lift the belt edge and squeeze the silicone in a zigzag across the deck surface, never on top of the belt. Sole describes about 15 inches of zigzag along each side.
Use the stated amount. Horizon specifies 20 ml, up to 10 ml more if needed, never over 30 ml at once.
Retighten the same number of turns on each bolt.
Spread it. Horizon runs the belt at 3 mph for 3 minutes, then walks on it for 3 minutes; Sole walks at about 3 mph for at least 5 minutes.
Wipe excess from the belt edges with a damp cloth, and check centering.

On Horizon consoles with a LUBE message, hold Speed Up and Stop together for 5 to 7 seconds to clear it.

How Often Should You Lubricate a Treadmill?

Your manual wins, but published schedules cluster around three months:

Manufacturer	Published interval	Notes
Horizon	Every 3 months or 150 miles	Console shows LUBE at 300 miles and will not run until reset
Sole	Every 90 hours or 90 days	Check the deck every other month; TT8 is waxed, no lube
NordicTrack (UK)	Every 3 months or 130 miles	Check more often under heavy use
iFIT (NordicTrack US blog)	At least once a year	Even if the treadmill is not used daily
KingSmith WalkingPad	Every 3 months	5–10 ml of silicone oil
Yesoul W2 Pro walking pad	By weekly use	Under 3 h/week: every 5 months; 4–7 h: every 2 months; over 7 h: monthly

Rather than trusting the calendar, do the check NordicTrack and Yesoul describe: unplug, lift the belt edge and touch the center of its underside. If your fingers come away with no oil, it is time. If it is already slick, leave it.

Why the iFIT figure looks so different: the three-month intervals assume regular use, while iFIT’s once-a-year guidance is a floor for lightly used machines, because silicone dries and collects dust even when the belt is idle. Heavy use, a dusty room or a heavier user pushes you toward the short end. Log the date and the odometer reading each time you lubricate, so you can follow mileage-based schedules like Horizon’s 150 miles instead of guessing.

What Lubricant Should You Use on a Treadmill?

100% silicone made for treadmills, or the product your manufacturer names. Sole specifies 100% silicone-based treadmill lubricant; Horizon ships its machines with 100% silicone oil; Yesoul calls for methyl silicone oil.

What not to use, per the manufacturers:

WD-40, silicone caulk, and spray or foam products (Sole). Silicone spray from a hardware store is not the same as treadmill silicone and often carries solvents.
Oils and greases made for other purposes, which NordicTrack UK warns can clog or damage the treadmill.
Anything at all on a waxed deck (Horizon, Sole).

More is not better. KingSmith’s WalkingPad manual warns that excess silicone oil makes the belt slip, and Horizon caps a single application at 30 ml. Over-lubrication shows up as a belt that hesitates under footstrike and oil creeping out of the edges; wipe the edges and run the belt at walking pace to work off the surplus.

How Do You Adjust Treadmill Belt Tension and Tracking?

Both adjustments use the two rear (idler) roller bolts at the end opposite the motor. Always unplug before touching them.

Tension (belt slips or hesitates): NordicTrack’s support page says to turn both idler roller bolts clockwise a quarter turn with the hex key, then check: a correctly tensioned belt lets you lift each edge 2 to 3 inches off the walking platform. Walk on it for a few minutes and repeat if it still slips. NordicTrack’s T5.7 manual warns that overtightening decreases performance, and it also loads the roller bearings.

Tracking (belt drifts to one side): Sole’s rule is to tighten the bolt on the side the belt is moving toward by a quarter turn clockwise, run it, and recheck. Drifting left means tightening the left bolt. iFIT’s guidance is the visual check: the gap between belt and frame should be even on both sides. Walking pads work the same way at smaller scale; Yesoul’s manual uses half-turn steps on both sides equally.

Run the belt empty at walking speed between adjustments, and stand clear of the rear roller while it moves.

Common mistakes to avoid:

Turning only one bolt to fix slipping. Tension needs equal turns on both sides, or you create a tracking problem.
Big adjustments. A quarter turn is the step NordicTrack and Sole both use; more overshoots.
Tightening a slipping belt that is really dry. Check lubrication first: a dry deck grabs the belt and feels like slip.
Adjusting with someone on the belt or with the machine plugged in.

What Maintenance Does a Treadmill Need? A Schedule

Put together, the manufacturer guidance above makes a short routine:

When	Task	Source of the interval
Every session	Clip on the safety key; wipe sweat from console and rails	General practice
Monthly	Check belt centering; vacuum around and under the machine	Sole (centering)
Every 2 months	Touch-check the deck for dryness	Sole
Every 3 months or 130–150 miles	Lubricate a silicone deck	Horizon, NordicTrack UK
At least yearly	Lubricate, even with light use; vacuum inside the motor hood	iFIT
When it slips	Quarter-turn tension adjustment	NordicTrack

Unplug before cleaning or opening the motor hood, as NordicTrack’s manual warns. When the machine is idle in a home with children, the CPSC’s advice after the Peloton Tread+ recall applies: unplug it and keep the safety key out of children’s reach. For choosing a machine that is easy to service, see our best treadmills for home guide.

FAQ

How often should I lubricate my treadmill?

Follow the manual first; common guidance for silicone-lubricated belts clusters around every three months or a stated number of hours, more often under heavy use or in dusty rooms. Machines with factory-waxed belts must not be silicone-lubricated at all — check which type you own before applying anything.

Can I use WD-40 or household oil on the belt?

No. Petroleum-based products can swell or degrade belt backings and gum the deck surface. Use only 100% silicone treadmill lubricant, or the specific product your manufacturer names.

Why does my belt drift to one side?

Usually minor unevenness in tension between the two rear roller bolts, occasionally an unlevel floor or a one-side-dominant running gait. Correct it a quarter-turn at a time on the side it drifts toward, at walking speed, per your manual’s procedure.

Is it bad to keep a treadmill in the garage?

Manufacturers generally discourage it: humidity corrodes, temperature swings stress electronics, and dust load rises. If the garage is the only option, a dehumidifier, a machine mat, a dust cover, and stricter cleaning intervals mitigate the worst of it — but check whether garage placement affects your warranty.

Do you put treadmill lubricant on top of the belt or underneath?

Underneath, on the deck. Horizon's procedure is to loosen the rear roller bolts, lift the belt and squeeze silicone in a zigzag across the deck surface, never onto the top of the belt. Lubricant on top makes the walking surface slippery and does nothing for the friction between belt and deck, which is what lubrication is for.

Can you over-lubricate a treadmill?

Yes. KingSmith's WalkingPad manual warns that excess silicone oil can make the belt slip, and Horizon caps a single application at 30 ml. Signs of too much are a belt that hesitates under your feet and oil seeping from the belt edges. Wipe the edges, run the belt at walking pace for a few minutes, and use less next time.

How tight should a treadmill belt be?

NordicTrack's support guidance is that you should be able to lift each edge of the belt 2 to 3 inches off the walking platform. If the belt slips under footstrike, tighten both rear roller bolts a quarter turn clockwise and walk on it to check. Overtightening, which NordicTrack's manual warns against, reduces performance and loads the roller bearings.

How do I know if my treadmill belt is waxed?

Check the owner's manual, which Horizon names as the way to tell. Waxed decks are described as maintenance-free, and Horizon says nothing should be applied to them for their life, including silicone. Sole's TT8, for example, uses a waxed deck that specifies no lubrication. If the manual calls for silicone, it will give an interval and an amount.

Sources

About This Guide

Written by Mike Callahan, AmericaLifts’s founder and editor. Our educational guides follow the same standard as our reviews — see the editorial policy. Nothing on this page is medical or personalized training advice; if you have an injury or health condition, talk to a qualified professional first.

Note: Always follow your specific model’s manual where it differs from this guide — lubrication type and interval especially, since using the wrong lubricant (or lubricating a pre-waxed belt) can cause damage and void warranties.

How to Lubricate a Treadmill, Plus the Rest of Treadmill Maintenance