On the second time I rode my new Cozybike, which is an electric bicycle that was shipped to me in a huge box, the crankarm fell off after only driving about 7 or 8 blocks. I hired a guy to put pedals on and the other work needed to set up the bike. He seemed to have all the right tools and experience. The problem that happened, was the area peddling was making noise and feeling strange, then the crankarm with the pedal still on it came off on the street. Turns out this product is made in China. How can things go wrong so fast and how would it be repaired?
Crank bolts are rarely ckecked when building a bike, they are usually tight from the factory and don't need to be looked at.
Sometimes they are not, but you can fix it at home if you have metric socket tools and a ratchet handle.
Grab a small flat blade screwdriver and pry off the grey plastic cap, you should find the nut in there, you'll need that!
Rotate the arm that is still attatched so the pedal is at the bottom,
Move to the other side of the bike and slide the other arm onto the axle with the pedal at the top and facing away from the frame. Thread the nut on by hand.
Grab the ratchet and tighten it tight (same weight as doing a push-up or lifting a 50lb bag of something), go to the other side, take the grey cap off tighten that arm as well. Then put both caps back on and ride in peace.
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Usually takes special tools. The pedals should be removed, the crankset is either a single arm or a 3 piece unit. If its a single, remove large nut on one side of the crank, usually the left side. Then remove the inside cone, the bearings are visible and should be removed. The last is the crankarm itself. It will only come out if thew left side bear is removed. Twist it gently and it usually comes out at the 3 o'clock position.
If its a 3 piece crankset, special tools are need to remove. SAuggest you take it to the nearest bike shop.
If its a onepiece crankset, there should be a large bolt on the rear side. This bolt is bvackwards threads. Tighten spocket cone, grease the bearing on that side of the bike. Put crankarm thru frame, put other bearing in, with ample supply of grease. Tighten cone, add washer, then locknut. Crank bearinbgs should be set so they spin freely without extra up and down motion or slop.
I went to a five and dime and bought streamers for my kids, they made their own and had a blast doing it,, you can use a ziptie, once they add all the colors they want, and stuff that in the handlebar grip hole to mount them,
YEA! Iron Horse blows.... its cause i test rode one in this demo I went to and the whole rear derailleur came right off... Sticking with the Trek, Cannondale and Specialized.... with the budget I have of course.
If, the threads aren't stripped, you can put it back on by getting a pedal wrench, and standing in front of the bike, now take the wrench and turn it towards you (clockwise) to tighten. But, if you rode with it loose, then you need a new crank arm. If, the store put it together go back to them but if you did, it is not a defect and you have to pay for one.
On these newer pumps, the plastic piston comes apart, and to fix it a new part is in order. Without looking at it, I think that is what might have happened. Bicycle pumps are almost throw-away items these days. In the old days you could buy all sorts of pump parts, but not anymore. Good luck