The most common restoration question on old fans is how to replace the wiring.. The line cord is fairly straight forward, but the wiring from the motor to the base is more difficult. Here's how I do it:
Step 1: Identify the Connections
Disconnect the wiring from the motor at the speed control in the base of the fan. There are typically 2-3 wires (most of the time 3). Mark each of the three wires. I like to use Liquid White Out. Make dots on the wire and a corresponding number of dots on the point where it's connected to the speed control. (ie 1-dot, 2-dots, 3-dots) Remove the wiring at the speed control. It's also wise to make a make a little chart and measure the resistance with an ohm-meter for every combination of the three wires. (this can save time during re-assembly)
1-2: ____ ohms
1-3: ____ ohms
2-3: ____ ohms
Step 2: Prepare for Removal of the Stator
The Next step is to remove the stator from the motor case.
1. Remove the motor from the fan. Make a diagram if needed for re-assembly.
Step 3: Remove the Stator -Cast Iron Motor Case
For a cast iron motor case place a short piece of iron pipe inside the motor case (2-3" diameter) and gently tap it on a concrete or steel surface. The mass of the stator will usually break away from the case easily. A few taps and its usually out. If it's real stubborn try the freeze and heat/liquid wrench trick in 3A. Be extra careful if you have a Century skeletal or GE Pancake with an open frame motor.
Step 3A: Remove the Stator - Stamped Steel/Press Fit Motor Case
These stamped steel case stators can be a challenge (ie Westinghouse):
1. Remove the back cover of motor and completely remove stator housing studs.
2. Open a vise to precisely the ID of the motor case + a few thousands of an inch more.
3. Place edges of motor housing on top of vise jaws.
4. Get 4 long machine screws (10-32 I believe). (length > thickness of motor case) Screw them thru the housing into the stator. Make sure you get good thread contact into the stator.
5. Align two of them right over the vise jaws.
6. Use a hammer and tap the screws alternating between them. Rotate the stator 90 degrees and repeat. The stator should gradually come out thru the open vise. Go slow and don't let the stator get cockide as it comes out.
If this doesn't work and all else fails you can drill two small holes in the front of the motor case and use a pin punch to help motivate the stator to come out. The holes won't be too noticeable and it's a small price to pay to save a fan.
Before I proceed with this I would freeze the motor and then go around the housing with a propane torch to try and break the rust/corrosion hold. A little liquid wrench around the circumference might also help but go easy.
Note: For step #4 it might help to start with short machine screws which are less likely to bend and then switch to longer ones once the stator is coming out.
Step 4: Replace the Stator Leads
Step 5: Re-install the Stator