Where can I purchase a replacement WG-630-1 timer motor?

The motor will turn faster with higher frequency because the phase changes is faster. No damage to the motor. Just ensure that the voltage is within the operating range. Amperage kills the motor, subjecting high loads on it will eventually burnt it's windings and become expensive to repair.

my suggestion would be to replace the whole thing, if that gear is wore out. it would get ruined again run against a wore part. I would say you will be fixin it constantly just replacing gear

Which timer is this for?
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#T100

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

1) Copy fo0llowing links:
http://waterheatertimer.org/How-to-replace-Intermatic-clock-motor.html#clock
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#Hz

2) The suffix, -1 and -3 are not important.

3) WG733 is 208-277 Volt clock motor, normally found on sprinkler timer or T1900 series. WG430 is 120Volt clock motor normally found on T1400 series.

4) T103 timer is stock 120Volts, but can be changed into different voltage timer by changing clock motor.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Open following link for T106 240volt troubleshoot and repair steps.
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html

Timer is probably repairable if manual override clicks crisp and clean and load turns on-off.
If the timer dial is not rotating or not on time, then replace clock motor. WG number is printed on clock motor.
If dial is rotating on time, then replace 156T1978A trippers.

Open following link for Intermatic parts:
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#clock-motor

WG5094 does not show in Intermatic charts as a replaceable part.
None of the regular sellers of clock motors show that part.

What timer does this come off of?
Add a comment with in-focus photo of timer (not motor) that you post on Flickr for possible help identifying part.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

208-277 Volt 40 amp 5HP at 240Volt
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK2?Pid=search

http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/t104%20-%20english.ashx

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

WG1573 is a 240 Volt clock motor for T100 series timers.
This means you have T-104 timer.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
Image shown on link above is T104R outdoor timer.
T104 indoor timer is the same except door does not have rubber gasket.
Terminals are labeled A 1 2 3 4
If this is not your timer, then add a comment.

Following instructions will convert T104 240V timer to T103 120V timer

Clock motor can be replace with identical 120V clock motor from Grainger
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK1?Pid=search

Timer mechanism snaps out and clock motor is located on back.
Remove clock motor with star screwdriver tip

Connect new clock motor wires to DIFFERENT terminals than before.
Old clock was connected to terminals 1 and 3
New 120V clock motor is connected to terminals A and 1

Wiring for 120V T103 is shown on link below.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T103
White neutral wire must connect to terminal A
Black hot wire must connect to terminal 1

http://www.amazon.com/Intermatic-Clock-Motor-Leads-WG433-20D/dp/B0031DOHLG

http://www.nextag.com/intermatic-wg_-_433/compare-html

http://www.midlightelectric.com/acatalog/Intermatic_WG433-10D.html

I did ordinary google search for WG-433

looks like $21-33

If you can also manually turn the dial so that the load turns ON and OFF, then the timer motor is bad :-( Replacements are available here for about $30:
http://www.aplussupply.com/intermatic/timer.htm
Scroll down to "WG 1573", Timer motor 208-277"