Install Cotter Pins, Cups, and Bearings in Bicycle Cottered Crank
Install Cotter Pins, Cups, and Bearings in Bicycle Cottered Crank
> > > REMOVING COTTER PINS
Copy and paste this link in Google SEARCH. That article tells how to remover old cotter pins with a hammer and how to install new cotter pins.
http://www.sheldonbrown.com/cotters.html
Remove the old cotter pins by hitting them with a hammer. Do
not hit the cotter pin with a hammer unless you have the end of the
crank axle (spindle) that you are working on resting on a piece of pipe
or something or you will damage the bearings and the cup. Just getting
the wheels of the bicycle off the floor or ground is not enough. The
bicycle has to be supported by something that is under the cotter pin
that you are hitting with a hammer, or under the crank spindle next to
the cotter pin. The end of the pipe or whatever you have under the
cotter will be holding one wheel of the bicycle off the floor (one wheel
can be on the floor) and it needs to be on a HARD surface, not on the
soft ground, so the crank bearings will not move downward when you hit
the cotter pin with a hammer. Hit the cotter pin with a downward
motion of the hammer so the pipe of board that you have under the
cotter pin will prevent the bearings from being pushed with great force
against the bearing race when you hit the cotter pin with a hammer.
You can hit the old cotter pin fairly hard to drive it out, but do not hit the new cotter pin very hard when tightening it. Some people want to have a
wrench on the nut and be putting some pressure on the wrench when they
hit the cotter pin with a hammer so that the nut will tighten instantly
as soon as they hit the cotter pin with a hammer, but the instructional
videos that I have seen do not say to do that.
How to remove stuck crank cotter pin with a hammer - youtube. Time 4:57. Published Dec 19, 2013. To see the video, put the title in the Google or youtube SEARCH.
If you hit the threaded part of the cotter pin with a hammer,
the surface of the hammer that hits the pin might be at a slight angle
to the pin, causing the threaded part of the pin to bend or break. It
will be less likely to bend or break if you do it the the way this video
shows.
How to remove stuck crank cotter pin with a vice on vintage bike - youtube. Time 3:15. Published Dec 18, 2013. To see the video, put the title in the Google or yahoo SEARCH.
> > > INSTALLING COTTER PINS
On some bicycles, you may have to file the flat part of the
cotter pin down some more to make the cotter pin go in far enough for
the nut to go on.
After you put in the second cotter pin, and before you tighten
the nut, check to see that the crank arms are at the correct angle to
each other.
It may be best to install cotter pins in matched pairs because
if you install only one cotter pin, it may not match the cotter pin in
the other arm and the arms might not be straight with each other when
you finish.
Put some grease on the cotter pin and on the flat surface of the spindle that the cotter pin slides onto.
You cannot tighten a cotter pin tight enough just by
tightening the nut. You have to tap it with a hammer lightly, then
tighten, then tap some more, then tighten, and continue doing that until
the nut will not tighten any more after you hit the cotter pin with a
hammer.
After riding the bicycle a few miles with the new cotter
pins, check to see if it needs tightening as it may work loose soon
after you start riding the bicycle. If you ride with a loose cotter
pin, the cotter pin will soon be ruined and you cannot tighten it so it
will hold the crank arm in place. To see if it needs tightening, hit it
with a hammer the same as when it was installed and see if the nut will
turn to tighten it.
> > > IF YOU ARE TAKING THE CUPS OUT TO CLEAN OR REPLACE THE BEARINGS
The direction that you will probably need to turn the cups to unscrew them are:
On most bicycles with cottered cranks, unscrew the left lock
nut and cup counter clockwise. Unscrew the right cup clockwise EXCEPT
on vintage French and Italian bicycles, unscrew the right cup counter
clockwise.
> > > TO SEE VIDEOS ON YOUTUBE SHOWING HOW TO
INSTALL ALL KINDS OF BICYCLE PARTS, GO TO THIS GUIDE ON THE blogger.com WEBSITE. I wrote the guide, but the videos are by several different people.
DISCLAIMER:
I am not responsible if anyone is injured because they
followed the instructions in of the articles I wrote, or in any video or
article by others that I recommend. Some information in the articles
that I wrote and in the videos and articles by others that I recommend
could be dangerous, and anyone who tries to follow the instructions in
those articles and videos could be seriously injured. Repairing or
servicing bicycles can be dangerous.
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