Quote:
Originally Posted by sanddrag
If you can heat up the gear a bit without heating up the motor, that will help. also, you shouldn't be using the can or mounting holes to hold the motor while pressing. You need to put the corner of a plate under the back end of the armature to support it. Also, make sure your press is in good order (not real sloppy) and have someone hold the motor straight while the other person slowly presses the gear on. A bit of oil on the shaft may help as well. If you still can't get it without bending the shaft, the press fit may be to tight and you may want to ream out the gear half a thou or so and try again.
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All sounds like good advice to me.
I've pressed on a lot of gears in that shaft size in recent times. Another thing to notice is that sometimes the shafts are oversize and the gear is way under. Sanding a running motor with emory paper (cover holes to prevent dust from entering motor) is a decent way to fix this. Otherwise, it's almost impossible to press on straight.