Is your treadmill slowing down during your walk or run? This common problem can be frustrating, but you can often fix it yourself. This guide will show you how to fix treadmill slows down issues with clear, step-by-step solutions.
Before you call for expensive service, try these troubleshooting steps. Most slowdowns are caused by a few simple things you can check at home.
How To Fix Treadmill Slows Down
Start with the simplest solutions first. This systematic approach saves you time and effort. Always unplug the treadmill before inspecting or touching any mechanical parts for safety.
1. Check for Basic Power Issues
A treadmill that isn’t getting enough power will struggle to maintain speed. This is a very common culprit.
- Plug Directly into the Wall: Ensure the treadmill is plugged directly into a dedicated wall outlet. Avoid power strips, extension cords, or outlets shared with other large appliances.
- Test the Outlet: Plug another device into the same outlet to confirm it’s working properly. Sometimes a tripped circuit breaker is the simple answer.
- Inspect the Power Cord: Look for any visible damage, fraying, or bent pins on the cord and plug.
2. Clean and Lubricate the Deck
Friction is the enemy of speed. A dry or dirty running belt creates drag, forcing the motor to work harder and often slowing down.
- Unplug the Treadmill: Safety first! Always disconnect power.
- Check Belt Alignment: The belt should be centered on the deck. If it’s off to one side, use the adjustment bolts at the rear roller to center it (usually a 1/4 or 1/2 turn at a time).
- Clean the Deck: Lift the belt and wipe down the deck underneath to remove dust, dirt, and old lubricant residue.
- Apply Lubricant: Use only treadmill-specific silicone lubricant. Apply as per your manual’s instructions, typically in a thin line down the center of the deck under the belt.
- Let it Soak In: Allow the lubricant to distribute for a few minutes, then run the treadmill at a slow speed for a few minutes to spread it evenly.
3. Inspect the Drive Belt
The drive belt connects the motor to the front roller. If it’s loose, worn, or glazed, it can slip under load, causing slowdowns.
- Locate the Motor Cover: You’ll need to remove the motor hood, usually held by a few screws.
- Check for Tightness: With the treadmill off and unplugged, press on the drive belt midway between the motor and roller. It should have about 1/4 to 1/2 inch of deflection. If it feels loose, it may need tightening.
- Look for Wear: Inspect the belt for cracks, fraying, or a shiny, glazed appearance. A worn belt needs replacement.
Note: Tightening or replacing a drive belt can be tricky; consult your manual or consider a pro if your unsure.
4. Examine the Walking Belt Tension
The walking belt (the part you run on) also needs correct tension. If it’s too loose, it can slip on the rollers, especially when you step on it.
- Perform the Lift Test: With the treadmill off, stand on the side rails. Lift the walking belt from the center of the deck. You should be able to lift it about 2-3 inches. If you can lift it higher, it’s too loose.
- Tighten the Belt: Use the adjustment bolts at the rear of the treadmill (both sides) to tighten. Always make equal, small turns (quarter-turn increments) on both sides to keep the belt centered.
- Re-test: After adjusting, re-check the tension and alignment. Run the treadmill empty to test.
5. Test the Motor and Motor Controller
If the mechanical parts check out, the issue might be electrical. The motor or its controller (the circuit board that tells the motor how fast to go) could be failing.
- Listen for Strain: Does the motor sound labored, or do you smell a burning or electrical odor? This points to motor strain.
- Check for Obstructions: Make sure nothing is caught around the rear roller or motor fan, like a piece of clothing or string.
- Consider the Load: Treadmill motors are rated by horsepower. If you are near the weight capacity of your machine, the motor may struggle, causing slowdowns during use.
The motor controller is harder to diagnose. If the console powers on but the motor acts erratic or weak, a failing controller is likely. This part usually requires professional diagnosis and replacement.
When to Call a Professional Technician
Some repairs are best left to experts for your safety and to avoid further damage.
- You suspect a problem with the motor or motor controller board.
- The drive belt needs replacement and you’re not comfortable doing it.
- You’ve tried all basic fixes and the problem persists.
- There are error codes on the display that you cannot clear.
Prevent Future Slowdowns
Regular maintenance is the key to keeping your treadmill running smoothly and preventing slowdowns.
- Lubricate Regularly: Follow your manufacturer’s schedule, typically every 3-6 months or every 130 miles.
- Keep it Clean: Vacuum around the motor and deck area to prevent dust buildup.
- Check Belt Tension: Give the walking belt a quick lift test every month or so.
- Allow Proper Ventilation: Don’t place the treadmill in a hot, cramped space. The motor needs airflow to stay cool.
Frequently Asked Questions (FAQ)
Why does my treadmill slow down when I step on it?
This almost always indicates a lack of traction, usually from a loose walking belt or a worn/dry deck that needs lubrication. The motor can’t maintain speed under the extra load because the belt is slipping.
Can a bad outlet cause a treadmill to slow down?
Yes, absolutely. A faulty outlet, a long extension cord, or a overloaded circuit can restrict the power flow to the treadmill motor, causing it to slow down under load. Always plug your treadmill directly into a dedicated wall outlet.
What does it mean if the treadmill motor is humming but the belt is slow?
A humming motor that isn’t turning the belt properly usually points to a drive belt issue. The belt may be broken, extremely loose, or has come off the pulley entirely. The motor is trying to run but can’t transfer power.
How much does it cost to fix a treadmill that slows down?
The cost varies widely. If it just needs lubrication, that’s under $20. A new drive belt might cost $50-$150 plus labor. A motor controller replacement can range from $200 to $500 with service. A professional diagnosis fee is typical first.
Is it worth repairing an older treadmill that slows down?
It depends on the repair cost versus the value of the treadmill. If it’s a simple fix like lubrication or a belt adjustment, yes. For major motor or controller repairs on a very old, basic model, replacement might be more economical in the long run.
By following this guide, you can diagnose and often solve the problem of a slowing treadmill. Remember to start simple, prioritize safety, and don’t hesitate to seek professional help for complex electrical issues. With a little maintenance, you can keep your treadmill running at the right pace for years to come.