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Question edited for clarity, full make model (what it is), and wrong type of peddle (drugs) / pedal (a bike).
Question moved from Cars and Trucks to Exercise Bike category.
That noise is normally caused by adjustable bearings that need tightening up. There is help in the link.
On my wife's machine, it was the clutch/freewheel coil spring making a chunching sound when it engaged each time. Any variation in lbs of thrust on each pedal stroke also made it crunch. This crunch is amplified through the body of the bike and becomes a clunk with each pedal stroke, and sounds just like a loose crank/ bottom bracket. I replaced the pedals to test and replaced the grease in the crank bearings/cups with Phil Wood grease, and agonized on the tightness of the cone on the crank before finding the real source of the noise. I allpied some grease to that clutch spring and worked it in a bit and there is no more clunk. Also, it is smoother in generat for my swapping out the crank bearing grease. Wife is happy. :-)
Have you lubricated all moving parts. Wheel bearings Chain and sprockets? Are there fenders if so are they a little loose?. Anything that is loose will vibrate and make a noise. Even dry pedals will make a noise. Crank also.Just a thought.
I suspect the crankset or bottom bracket. It can have the illusion of tightness when not moving, but "clunk" everytime you pres on the pedals. I would first make sure that the cranks are tight on the bottom bracket axle. This will require a metric wrench.
Your problem sounds like the brake assembly inside the hub is bad. If you bought the bike recently, take it back to the retailer. For proper repairs for this problem, I suggest taking your bike to the local bike shop.
Prepare to oil by filling a grease gun with lithium grease. Check your owner's manual for the exact type of grease for your unit.
2
Locate where it is you need to lubricate. Focus on the bearings, free-moving joints and attachments with moving parts such as handle bars, wheels, pedals arms and guide rails. Go to each location one by one when greasing.
3
Unfasten the bolts or screws that hold the joint or attachment that you wish to lubricate.
4
Grease each bolt and screw liberally. Tighten each bolt and screw back into its place when finished.
5
Wipe away any excess grease Loose Pedals
1
Kneel next to the left side of the elliptical's base. Use the Phillips screwdriver to tighten the two screws located in the center of the left pedal.
2
Use the Allen wrench to remove the bolt securing the left pedal arm to the pedal leg and body arm. Use the Phillips screwdriver to remove the screw securing the rear end of the pedal leg to the crank arm.
3
Pull the end of the pedal leg free of the crank arm. Wipe the crank arm clean, then apply a fresh coating of machine grease or silicone lubricant. Replace the end of the pedal leg back onto the crank arm and use the previously removed screw to secure it back into place.
4
Join the front end of the left pedal arm to the ends of the pedal leg and body arm. Use the previously removed bolt to connect the pieces together.
5
Move to the right side of the elliptical and repeat the above steps on the right pedal arm
Is the clunk noticed as soon as the brake pedal is released? Your brake shoes engage in the rear drum when the brake pedal is pressed and then release as the brake pedal is released. Your shoes may be worn and might be "hanging up" for a brief period, that would make a clunk sound your describing
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