Back Wheel The back left wheel is loose. I can't figure out how to tighten it. I can't seem to tighten it with a wrench. And it doesn't shorten with a hammer whacking away. Do I need a special tool?

Tighten axle bolt, item 12.

Loosen rear axle nuts.
Pull back on the rear wheel until the chain is tight, then move forward just a bit and tighten both sides with your hands at the same time. Try to keep the wheel centered.
Tighten the right axle nut, center the wheel and then tighten the rear.
Turn the crank slowly. The chain should have slight play at the tightest point in the crank rotation.
If the chain is too tight or too loose loosen the right nut and move the axle forward or back, tighten and retest.
When tension seems OK loosen left nut and center the wheel, then retest.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

Flip bicycle up-side-down so it sits on the seat and handlebars. Loosen the 2 nuts that hold the rear wheel on. Sitting behind the bike on the ground, so that you can align the wheel to a straight position, pull the wheel back so that the chain is snug. You don't need to pull hard, just hold the wheel in place and straight. Using the other hand, slowly tighten the axle nuts back down until the wheel is held in place. Once the nuts are tight enough to securely hold the wheel, tighten the nuts. Sometimes this method will make the chain too tight. If this happens, repeat the process as above, only this time when you go to tighten the nuts back down, squeeze the chain slightly to create a bit of slack. Ideally, the chain will be tight enough not to skip or slip, and at the same time, loose enough not to make noise, bind up, or do any damage.

There are "chain tensioners" available that hook around the rear dropouts of the frame and also around the axle, allowing you to tighten the chain to exact specs. simply by tightening or loosening adjuster screws. They will also help to keep things from loosening up over time. These make things much easier and I highly suggest looking into them.

Use any of a variety of oils and lubes available, but try to avoid WD-40 for chain lube. It will stop a squeak for now and make things seem to move smoother, but in the long run, WD-40 will attract dirt and debris to the constantly moving parts of your chain and can shorten the life of a chain considerably. Hope this helps.

~Ed

A bench grinder has left handed threads on one shaft and right handed on the other,so that the grinding stones don't unscrew the nut as you grind something.I haven't ever gotten around to getting a bench grinder,but on my father's, I used to just hand tighten the nut,then grab the grinding wheel with my hand while tightening the nut with a wrench.(You don't have to make it real tight,as the wheel pushing against the nut will keep it tight)

Hi emsfy...

When you put your chain back on this time, you will need a open end adjustable wrench or a wrench that will fit the nuts that are on the rear axle shaft and wheel assembly.
When you get your wrench, loosen the two nuts (1 on each side of the axle) and pull the axle wheel assembly back towards the back of the slot the axel is sitting in to tighten the chain, when the chain is tight you will tighten the two axel nuts and the job is finished.
The chain will stay on now.
Please take time to rate me thumbs up

Not supposed to use air gun on axle nut

Torque Wrench -- as you did

Check Wheel Sensors -- one may be bad or more
likely the mechanic damaged it.

Use a Volt Meter --put on A/C unplug sensor &
put meter on wires and spin the wheels

Do all four & compare

If its a singlespeed:

Examine the tightness of the bolts that attach the axle to the frame by loosening then with a wrench. If it was loose that could have been the problem.

Now check the alignment and equal spacing of the wheel inside the frame. Pull the wheel back in the dropouts so the chain has an inch or two of looseness. Lightly tighten the bolts and check again and crank the wheel with the pedals and spin. Check the chain and equal alignment of the wheel. Tighten the bolts that attach the wheel to the frame.

If its a quick release, make sure that when tightening you apply a good amount of force to close the lever at least 90 to 100 degrees. And do all of the above.

Hi:
Your guess is probably correct that they were over tightened on installation, or perhaps not greased at all? even if they were loose, they wouldn't be destroyed.

hummm the nut should be at 100nm which is a bit really when you tighten it a tad does the wheel move side to side or feels rough get back to me

Loosen the Back Nuts on the Side of the Rear Wheel, Then use a Wrench to Turn the Bolts extending out the Rear of the Bike in Clockwise to pull the Rear Wheel Back, Thus Tacking Slack out of the Chain. Do Not over Tighten as the CHain Tightens some itself with Flex when you put Weight on it. Retighten Axle Nut. Thats it.