Re: Cub Voltage Reg.

Posted by Bob M on October 16, 2000 at 05:35:40 from (192.232.120.194):

In Reply to: Cub Voltage Reg. posted by Randy on October 16, 2000 at 04:12:17:

Randy - A couple of possibilities:

1 - The volt/current relay in the regulator may be outta whack. Best bet is to replace the entire regulator unit. However if you are careful and have an accurate voltmeter you can try adjusting it yourself:

Remove the regulator cover and find the volt/current relay - it's the one with a normally closed contact (a spring tends to hold the relay contacts shut). Stick the voltmeter across the battery terminals. Now start the engine and run at max RPM. Very gently push on the relay armature spring hook with your finger finger while observing the voltmeter - voltage should increase with pressure on the spring hook. CAREFULLY bend the fixed spring hanger to increase the regulator spring tension -stop when the voltmeter reads 7.3 to 7.5 volts. It's a delicate, trial-and-error kind of procedure - be patient and take your time. When you are finished, sure the ammeter doesn't indicate more than 12 - 15 amps output at max RPM with the lights off - otherwise you risk burning out the generator.

2 - If the above has no effect, could be the 3rd brush inside the generator needs adjustment. Remove the dust band from the back end of the gen and peer inside. Check for worn out brushes and a dirty commutator. If all looks OK, you'll notice one of the three brushes is arranged so it can be rotated somewhat around the commutator - it is clamped in place by a machine screw thru the rear end plate. Loosen (but don't remove!) this screw and rotate the brush toward the next closest brush. However leave no less than 3 commutator bars of space between the 3rd brush and it's neighbor. Finally secure the 3rd brush clamp screw. Fire up the motor and check the ammeter to see if it shows more current. But if the ammeter shows greater than 12 - 15 amps, readjust the 3rd brush back the other way as required until you get this output.

If neither of the above have any effect, time to get the generator rebuilt. And plan to spend the extra $35 and put on a new regulator at the same time - you'll be glad you did.

Good luck!

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