The treadmill cost you £800, it lives in the spare room, and you’ve never done a single thing to maintain it. The belt’s starting to slip, there’s a squeaking noise that wasn’t there six months ago, and you’re vaguely aware that you were supposed to lubricate something at some point. Sound about right?
Treadmills are mechanical devices with moving parts under load. They need maintenance — not much, not often, but consistently. A treadmill that’s looked after properly lasts 10–15 years. One that’s ignored starts breaking down after 3–4. The good news is that the two most important tasks — belt lubrication and tension adjustment — take less than 15 minutes combined and cost about £10 per year. Here’s the full care schedule.
In This Article
- Why Treadmill Maintenance Matters
- Belt Lubrication: The Most Important Task
- How to Lubricate a Treadmill Belt Step-by-Step
- Belt Tension and Alignment
- Cleaning Your Treadmill
- Motor and Electrical Care
- When to Replace the Belt
- Maintenance Schedule at a Glance
- Frequently Asked Questions
Why Treadmill Maintenance Matters
A treadmill belt slides over a deck surface at speed, with your full body weight pressing down on it. That’s a lot of friction. Without lubrication, the belt and deck grind against each other, generating heat, increasing motor load, and wearing both surfaces prematurely.
What Happens Without Maintenance
- Belt slipping — the belt hesitates or jerks during foot strikes, especially during running. This is the first sign of a dry belt
- Motor strain — extra friction means the motor works harder, draws more current, and overheats. Motor replacements cost £150–300
- Belt and deck wear — a dry belt develops hot spots and can warp. A new belt costs £50–100 plus fitting
- Increased noise — squeaking, grinding, or a burning smell all indicate friction problems
- Higher energy consumption — a struggling motor uses noticeably more electricity
The Cost of Neglect vs Maintenance
A bottle of treadmill lubricant costs about £8–12 and lasts 6–12 months. A motor replacement costs £200+. Belt replacement with fitting costs £100+. Regular maintenance is roughly 100 times cheaper than the repairs it prevents.
Belt Lubrication: The Most Important Task
If you do one thing for your treadmill, make it this. Belt lubrication reduces friction between the belt and the deck, keeping the motor running cool, the belt running smooth, and the deck surface intact.
What Lubricant to Use
100% silicone lubricant — specifically designed for treadmills. It comes in liquid or spray form. Do not use WD-40, petroleum-based lubricants, or general-purpose silicone sprays that contain additives. These can damage the belt material and leave residue that attracts dust.
Recommended products available in the UK:
- Treadmill Doctor silicone lubricant — about £10 for a bottle that lasts 4–6 applications
- GymMaster treadmill lube — about £8, widely available on Amazon UK
- Your manufacturer’s own lubricant — check your manual. Some brands (NordicTrack, Life Fitness) recommend specific products
How Often to Lubricate
- Home use (3–5 sessions per week): every 3–6 months
- Heavy home use (daily running): every 2–3 months
- Light use (1–2 sessions per week): every 6–12 months
Check your manual for the manufacturer’s recommendation — some modern treadmills have pre-lubricated decks that need less frequent attention.
How to Tell If Your Belt Needs Lubricant
Lift the edge of the belt at the centre of the deck and slide your hand underneath. The surface should feel slightly slippery — like there’s a thin film of oil. If it feels dry, tacky, or rough, it needs lubricating. You can also tell by sound: a properly lubricated treadmill runs almost silently under the belt. If you hear a rhythmic squeaking or feel the belt hesitate during foot strikes, it’s overdue.
How to Lubricate a Treadmill Belt Step-by-Step
This takes about 10 minutes and requires no tools beyond the lubricant bottle.
- Switch off the treadmill and unplug it from the wall — not just the power button, physically unplug it
- Lift the belt at the edge, roughly in the centre of the deck. Most belts have enough slack to lift 5–10cm
- Apply lubricant to the deck surface underneath the belt — about a tablespoon’s worth per side. Squeeze it in a zig-zag pattern along the centre third of the deck
- Repeat on the other side
- Lower the belt, plug in, and run the treadmill at a slow walking speed (2–3 km/h) for 3–5 minutes with nobody on it. This distributes the lubricant evenly across the deck surface
- Walk on the treadmill for 2 minutes to press the lubricant into full contact with the deck
- Wipe any excess lubricant from the edges of the belt with a dry cloth — excess on top of the belt makes it slippery to walk on
Important Safety Notes
- Always unplug before putting your hands near the belt or deck
- Don’t over-lubricate — too much makes the belt slip and creates a mess on the floor underneath
- Wear old clothes — silicone lubricant stains and doesn’t wash out easily
- The Fitness Industry Association recommends following manufacturer maintenance schedules, which universally include belt lubrication as the primary task
Belt Tension and Alignment
The belt should be tight enough not to slip but loose enough to lift 5–7cm at the centre edge. Too tight and you overwork the motor. Too loose and it slips during running.
Checking Tension
Stand on the treadmill, hold the handrails, and walk at a moderate pace. Push off firmly with each step. If the belt hesitates or slips under your feet, it’s too loose. If it feels abnormally stiff to walk on (more resistant than usual), it might be too tight.
Adjusting Tension
Most treadmills have tension bolts at the rear of the deck — one on each side. Use an Allen key (usually 5mm or 6mm, often supplied with the treadmill):
- Turn each bolt a quarter-turn clockwise to tighten (equal amounts on each side to keep the belt centred)
- Test by walking on it again
- Repeat until the belt doesn’t slip but still lifts 5–7cm at the edge
Belt Alignment
If the belt drifts to one side, the tension is uneven. Tighten the bolt on the side the belt is drifting toward by a quarter-turn. Run the treadmill at walking speed for 30 seconds and check again. Small adjustments — never more than a quarter-turn at a time.
If you’ve set up your treadmill in a home gym space, ensure the floor is level. An uneven surface causes persistent alignment drift that no amount of bolt adjustment will fix.
Cleaning Your Treadmill
Dust and debris accumulate around the motor, under the belt, and on the frame. Left unchecked, dust clogs motor ventilation, accelerates belt wear, and makes the treadmill look and smell unpleasant.
After Every Session
- Wipe down the handrails, console, and belt surface with a damp cloth
- Clear any debris from around the base of the machine
Weekly
- Vacuum around and under the treadmill — pet hair and dust accumulate here fast
- Wipe the exposed deck edges where dust collects between the belt and frame
Monthly
- Under the belt: carefully vacuum under the edges of the belt using a narrow nozzle. Dust buildup here grinds into the deck surface
- Motor housing: if your treadmill has a removable motor cover (check the manual), vacuum the motor compartment gently. Never use a wet cloth near the motor
- Console buttons and touchscreen: use a slightly damp microfibre cloth. Avoid cleaning sprays directly on the console — spray onto the cloth first
Sweat Management
Sweat is corrosive. It contains salt that accelerates rust on exposed metal surfaces and degrades rubber components. If you’re doing intensive treadmill workouts, drape a towel over the console and handrails during the session and wipe everything down immediately afterwards. Pay particular attention to the area where the belt meets the frame — sweat drips down here and pools, causing premature belt edge deterioration.
Reducing Dust and Debris
Place the treadmill on a purpose-made mat (about £20–35 from Amazon UK or Argos). This catches dust, reduces vibration, protects the floor, and makes noise reduction in your home gym easier. Keep the area around the treadmill clear of clutter that could get pulled under the belt.
Motor and Electrical Care
The motor is the most expensive component. Keeping it cool and clean is mostly about airflow and dust management.
Motor Brush Inspection
Treadmill motors use carbon brushes that wear down over time. Most last 2,000–3,000 hours of use. Signs of worn brushes include:
- Sparking visible through the motor housing vents
- Burning smell from the motor area
- Speed inconsistency — the belt surges or slows unexpectedly
Brush replacement is a 20-minute job if you’re handy with a screwdriver, or a £40–60 service call from a technician. Your manual will specify the brush type needed.
Power Surge Protection
Always plug your treadmill into a surge protector, not directly into a wall socket. Power surges from the mains can fry the control board — and control board replacements cost £150–250. A decent surge protector costs £15 and protects your entire investment.
Grounding
Make sure the treadmill’s plug has a functioning earth pin and that your socket is properly earthed. Treadmill motors generate static electricity, and improper grounding can cause erratic console behaviour and minor electric shocks from the handrails. If you get static shocks when touching the machine, check the socket’s earth connection — or use a mat underneath, which also reduces static buildup.
When to Replace the Belt
Even with perfect maintenance, treadmill belts wear out. The typical lifespan is:
- Standard belts: 3,000–5,000 km of use (roughly 3–5 years of regular home use)
- Premium belts: 8,000–10,000 km (5–8 years)
- Commercial-grade belts: 15,000+ km
Signs the Belt Needs Replacing
- Visible wear — shiny, smooth patches where the texture has worn away
- Fraying edges — the belt material is breaking down along the sides
- Dark marks on the deck — belt material transferring to the deck surface
- Persistent slipping after proper lubrication and tension adjustment
- Wrinkles or bunching — the belt material has stretched unevenly
Replacement belts cost £40–80 for most home treadmills. Fitting yourself saves the labour cost — there are plenty of video guides for specific models. Otherwise, a technician charges £60–100 for the job. If you’re building out your gym setup, our guide to choosing home gym equipment covers when repair vs replacement makes sense.
Maintenance Schedule at a Glance
After Every Use
- Wipe down surfaces
- Clear debris from around the base
Weekly
- Vacuum around and under the treadmill
- Check belt alignment visually
Monthly
- Clean under the belt edges
- Vacuum motor compartment (if accessible)
- Deep clean console and frame
Every 3–6 Months
- Lubricate the belt (the most important task)
- Check belt tension and adjust if needed
- Inspect power cable and plug for damage
Annually
- Full inspection: belt condition, deck surface, motor brushes
- Check all bolts and fixings for looseness
- Consider professional service if the treadmill is over 5 years old
Frequently Asked Questions
Can I use WD-40 on my treadmill belt? No — WD-40 is a solvent and water displacer, not a lubricant. It evaporates quickly, leaves residue, and can damage the belt material. Use only 100% silicone treadmill lubricant. Check your manual for any specific product recommendations from your manufacturer.
How do I know if my treadmill belt needs replacing rather than lubricating? If the belt still slips after proper lubrication and tension adjustment, or if you can see shiny worn patches, fraying edges, or dark transfer marks on the deck, the belt needs replacing. Lubrication fixes friction problems but can’t fix physical wear.
My treadmill smells like burning — is that serious? Yes. Stop using it immediately. A burning smell usually indicates either a dry belt overheating against the deck (lubricate and test) or worn motor brushes creating friction. If lubrication doesn’t fix it, have the motor inspected. Running a treadmill that smells burnt risks motor damage and in extreme cases, fire.
How much does treadmill servicing cost in the UK? A professional home service typically costs £60–100 for a standard maintenance visit (lubrication, tension, cleaning, inspection). Motor brush replacement adds £20–40 in parts. Full belt replacement is £40–80 for the belt plus £60–100 labour. Annual servicing is recommended for machines over 5 years old or those in heavy use.
Does a treadmill mat help with maintenance? Yes — it catches dust and debris that would otherwise get pulled under the belt, reduces vibration that can loosen bolts, and protects the floor from lubricant drips. A £25 mat reduces cleaning time and helps keep the motor compartment cleaner.