Cub Generator Question

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
User avatar
Stanton
Team Cub
Team Cub
Posts: 5801
Joined: Mon Jun 22, 2009 6:56 am
Zip Code: 64070
Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
Circle of Safety: Y
Location: Lone Jack, MO

Cub Generator Question

Postby Stanton » Wed Oct 08, 2014 6:37 am

Haven't run my '47 for a while due to carb issues. Got the carb inlet heli-coiled and reinstalled. Didn't have a battery, but with a mag, decided to hand start it. Fired up just fine.

Here's the first question: While idling with the light/charge knob turned to the lowest setting, no noise. When I turn the know to high charge, I get a squealing sound from under the hood (generator). Why?

Second question: I drove it out of the barn after dusk and noticed a glow from behind the dash. I hopped off to find the light dimmer coil glowing at high idle. Is this normal? Or was it because I didn't have a battery installed?

Thanks.
Stanton
Image Circle of Safety

User avatar
raystractors
5+ Years
5+ Years
Posts: 340
Joined: Wed Aug 31, 2011 11:55 am
Zip Code: 37058
Tractors Owned: 1950 Cub, 1952 Cub, 1970 Cub, 1975 Cub, 1953 Cub, 1939 A, 1948 super A, 1952 super A, 1950 C demonstrator, 1952 Super C, 1949 H, 1956 farmall 300, 1957 international 350, 1963 Massey Ferguson 35
Circle of Safety: Y
Location: TN Dover

Re: Cub Generator Question

Postby raystractors » Wed Oct 08, 2014 7:35 am

It sounds like a short in the lighting wires. I had this happen on one of my 12 volt lowboys.

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
Posts: 23245
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Cub Generator Question

Postby John *.?-!.* cub owner » Wed Oct 08, 2014 9:19 am

Are you sure your knob is pointed right? It can be put on the switch in several different positions. All the way to the left is Lo charge, next to the right is high charge, and 3rd is dim lights, and last to right is bright lights. with no battery, and if you still have a cut out rather than a regulator, turning the lights on will result in having flashbulbs, as Scrivet learned. As Raystractors stated though, you most likely have a short in the wiring and the squeal you heard was the generator belt slipping when you switched it to high charge..
If you are not part of the solution,
you are part of the problem!!!

User avatar
Stanton
Team Cub
Team Cub
Posts: 5801
Joined: Mon Jun 22, 2009 6:56 am
Zip Code: 64070
Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
Circle of Safety: Y
Location: Lone Jack, MO

Re: Cub Generator Question

Postby Stanton » Wed Oct 08, 2014 2:22 pm

Knob is pointed correctly. Would the generator stop turning if there's a short?
Stanton
Image Circle of Safety

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 17814
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: Cub Generator Question

Postby Eugene » Wed Oct 08, 2014 2:36 pm

Install a fully charged battery and see what happens.
I have an excuse. CRS.

ShineOn
5+ Years
5+ Years
Posts: 63
Joined: Tue Aug 05, 2014 9:10 am
Zip Code: 63645
Tractors Owned: Bolens 1250

Cub 1949
Location: Roselle to Irondale - Missouri

Re: Cub Generator Question

Postby ShineOn » Wed Oct 08, 2014 6:11 pm

Eugene wrote:Install a fully charged battery and see what happens.


I always liked doing that myself when possible . Or adding a jumper battery to the circuit , just for a little boost .
The Constitution established a Government in Trust . Go from there .

User avatar
Stanton
Team Cub
Team Cub
Posts: 5801
Joined: Mon Jun 22, 2009 6:56 am
Zip Code: 64070
Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
Circle of Safety: Y
Location: Lone Jack, MO

Re: Cub Generator Question

Postby Stanton » Tue Oct 28, 2014 7:02 am

To continue...

Installed a battery (tested out at 6.11v) and had the same issues: while running (both at low and high RPM), the ammeter shows no charge at Low or High settings and there is a high pitched squeal when set to High. Removed the generator last evening and will take it to a local electrical shop for testing.

Included the wiring diagram I'm going by. Any suggestions?
Attachments
Early Cub Wiring Diagram.jpg
Early Cub Wiring Diagram.jpg (44.76 KiB) Viewed 877 times
Stanton
Image Circle of Safety

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
Posts: 23245
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Cub Generator Question

Postby John *.?-!.* cub owner » Tue Oct 28, 2014 9:07 am

That diagram would be correct for a pre-regulator tractor. I think you are correct in taking it to a generator shop, but before you do that try with the A lead disconnected, but only do it briefly. If you still get the squeal the generator probably has an internal short. If the squeal is cleared, the short is probably in the cut out relay. I said only do it briefly, because with no load the generator voltage can get high enough to damage the generator pretty quickly.
If you are not part of the solution,
you are part of the problem!!!

Jim Becker
Team Cub
Team Cub
Posts: 14426
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: Cub Generator Question

Postby Jim Becker » Tue Oct 28, 2014 11:07 am

The squealing sound could be the generator belt. On high charge, the load on the belt is increased because it takes more power to produce more power. If the belt slips enough, you won't get much charging because the generator is slowing down.

My bet is the generator will test OK.

User avatar
Stanton
Team Cub
Team Cub
Posts: 5801
Joined: Mon Jun 22, 2009 6:56 am
Zip Code: 64070
Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
Circle of Safety: Y
Location: Lone Jack, MO

Re: Cub Generator Question

Postby Stanton » Tue Oct 28, 2014 11:18 am

Appreciate your input. While the Cub was running and knob on Low setting, the voltage across the terminals at the battery was 6.05v. So, even on Low, it was not charging significantly.

I tried to adjust the belt, but the top bolt of the generator was at the outside end of the bracket. I may have to buy a little shorter belt for the fan, giving me more room for the generator to swing out.

I'll see what the shop says and let you know.
Stanton
Image Circle of Safety

User avatar
Stanton
Team Cub
Team Cub
Posts: 5801
Joined: Mon Jun 22, 2009 6:56 am
Zip Code: 64070
Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
Circle of Safety: Y
Location: Lone Jack, MO

Re: Cub Generator Question

Postby Stanton » Fri Oct 31, 2014 6:44 am

Shop tested the generator and cutout relay and there are no issues; runs just fine--didn't charge me either (no pun intended). So, this weekend, I'll reinstall and see what happens.

I asked the electrician about polarizing the unit after installation, to which he said you don't need to polarize a cutout. Does that sound right?
Stanton
Image Circle of Safety

User avatar
Bigdog
Cub Pro
Cub Pro
Posts: 24142
Joined: Sun Feb 02, 2003 12:50 pm
Zip Code: 43113
Circle of Safety: Y
Location: OH, Circleville

Re: Cub Generator Question

Postby Bigdog » Fri Oct 31, 2014 8:22 am

I suspect Jim B. is correct - your generator belt is too loose and is slipping under load.
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.

My wife says I don't listen to her. - - - - - - - - Or something like that!

Image

http://www.cubtug.com

User avatar
Stanton
Team Cub
Team Cub
Posts: 5801
Joined: Mon Jun 22, 2009 6:56 am
Zip Code: 64070
Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
Circle of Safety: Y
Location: Lone Jack, MO

Re: Cub Generator Question

Postby Stanton » Fri Oct 31, 2014 8:29 am

After picking up the gen, I also swung by and bought a short gen belt. We'll get that thing hummin'! :)
Stanton
Image Circle of Safety

Jim Becker
Team Cub
Team Cub
Posts: 14426
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: Cub Generator Question

Postby Jim Becker » Fri Oct 31, 2014 8:57 am

Stanton wrote:I asked the electrician about polarizing the unit after installation, to which he said you don't need to polarize a cutout. Does that sound right?

Technically he is right. You don't need to polarize a cutout. You better polarize the generator after it has been tested in an electrical shop. It is the one situation where you really need to.

I would question any advice from him!

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
Posts: 23245
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Cub Generator Question

Postby John *.?-!.* cub owner » Fri Oct 31, 2014 9:00 am

You polarize the generator, not the cutout or regulator,and yes, you should polarize it. With the engine NOT running, briefly jumper from the bat side to the gen. side of the cutout. A small spark is normal, and it should be done anytime the generator is removed. It usually does not HAVE to be done, but is a safety precaution to make sure it keeps the correct magnetic polarity.

Looks like Jim was faster than me, but that is normal. :P
If you are not part of the solution,
you are part of the problem!!!


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: No registered users and 3 guests