This site uses cookies to maintain login information on FarmallCub.Com. Click the X in the banner upper right corner to close this notice. For more information on our privacy policy, visit this link:
Privacy Policy

NEW REGISTERED MEMBERS: Be sure to check your SPAM/JUNK folders for the activation email.

charging... only at full throttle?

The Cub Club -- Questions and answers to all of your Cub related issues.
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.
DeckSetter
10+ Years
10+ Years
Posts: 3
Joined: Thu Dec 27, 2012 5:56 pm
Zip Code: 47320

charging... only at full throttle?

Postby DeckSetter » Tue Jan 08, 2013 12:03 pm

My cub seems to be charging only at full throttle. At anything less, it will just run the battery dead. Is there a guide to troubleshooting this or is my generator probably just shot? It is a 73 cub with a 12v system.

SPONSOR AD

Sponsor



Sponsor
 

User avatar
clodhopper
10+ Years
10+ Years
Posts: 807
Joined: Sat May 07, 2011 8:20 pm
Zip Code: 27526
Tractors Owned: 1950 Cub Demo
1978 Cub Cadet 1650
cub 193 plow
cub 174 planter
cub sidedresser
cub 144 cultivator
cadet 50C deck
Circle of Safety: Y

Re: charging... only at full throttle?

Postby clodhopper » Tue Jan 08, 2013 6:04 pm

Belt tight and ingood shape?
Check for loose/corroded connections.
Is it an alternator or generator?

User avatar
bob in CT
Team Cub Mentor
Team Cub Mentor
Posts: 6018
Joined: Thu Jun 07, 2007 9:34 am
Zip Code: 06040
Tractors Owned: 77 Cub (red); 74 Cub; 52 Cub; 50 Cub ( post-demo)
Circle of Safety: Y
Location: CT, Manchester

Re: charging... only at full throttle?

Postby bob in CT » Tue Jan 08, 2013 7:19 pm

Here is a good document to get the basics. Older systems used what is called a cutout relay to control the charging system. You have a voltage regulator so follow the suggestions for a VR, not the cutout. http://www.farmallcub.com/[ Sorry, direct links to manual section is not allowed. ]/files/Service%20Manuals/Delco%20Remy/Charging%20System%20Checks.pdf

ntrenn
10+ Years
10+ Years
Posts: 804
Joined: Tue Apr 17, 2012 7:55 pm
Zip Code: 47119
Skype Name: ntrenn
Tractors Owned: 63 Cub 221833 in family since '69
65 Lo-boy 19648 with an un-stuck #4 - it lives!!!
144 Cultivators with disc hillers
193 Plow
42C mower
59L mower mounted on the Fcub
23A Disc - lost possession
Circle of Safety: Y
Location: Indiana

Re: charging... only at full throttle?

Postby ntrenn » Tue Jan 08, 2013 10:16 pm

Sounds like you have slipping belts.
1. When you turn the fan with the tractor in neutral, does the crankshaft turn?
2. Hold the cooling fan stationary, hook two fingers on the generator fan and pull. If you can't slip the generator belt, it's tight enough. If it's a double belt, 3 fingers.

Just because the belt looks good does not mean it's doing its job. For about $15 both can be renewed. Then oil the fan hub....

If belts are tight, you could have the sticking regulator like I seem to have. Rap it with a wrench has worked. Turning lights on sometimes brings it back to life. Sometimes it goes on a 30 minute vacation, sometimes shorter, but it charges enough to keep the battery up.

Matt Kirsch
10+ Years
10+ Years
Posts: 4945
Joined: Tue Jun 08, 2004 3:04 pm
Zip Code: 14559
Circle of Safety: Y
Location: Rochester, NY

Re: charging... only at full throttle?

Postby Matt Kirsch » Wed Jan 09, 2013 10:53 am

Wouldn't slipping belts produce smoke and smell after a little while, though?

Check this out for troubleshooting generators:
http://www.ytmag.com/cgi-bin/viewit.cgi?bd=jd&th=304795

lazyuniondriver
10+ Years
10+ Years
Posts: 438
Joined: Tue Aug 07, 2012 1:37 am
Zip Code: 44134
Tractors Owned: 1949 & 1951 Farmall Cubs

Several Snapper Garden Tractors
Circle of Safety: Y
Location: Southern Suburbs of Cleveland, Ohio

Re: charging... only at full throttle?

Postby lazyuniondriver » Wed Jan 09, 2013 2:24 pm

Matt Kirsch wrote:Wouldn't slipping belts produce smoke and smell after a little while, though?


Almost never. If its slipping, horsepower is lost between the drive and driven pulley, its still turning but not at full efficiency. The belt will glaze up creating a protective coating preventing the belt material from melting.

If the driven pulley is completely locked up and the drive pulley has enough power to remain in motion, at that point you will observe smoke and usually some noise to go along with it.
"HAVE ALL YOUR DELIVERIES MADE BY UNION DRIVERS"
Image

ntrenn
10+ Years
10+ Years
Posts: 804
Joined: Tue Apr 17, 2012 7:55 pm
Zip Code: 47119
Skype Name: ntrenn
Tractors Owned: 63 Cub 221833 in family since '69
65 Lo-boy 19648 with an un-stuck #4 - it lives!!!
144 Cultivators with disc hillers
193 Plow
42C mower
59L mower mounted on the Fcub
23A Disc - lost possession
Circle of Safety: Y
Location: Indiana

Re: charging... only at full throttle?

Postby ntrenn » Wed Jan 09, 2013 5:39 pm

Mine was doing something a little different, but along the same lines - it would charge at low speeds, but the at higher speeds, it would stop charging.
I checked the belts and lo and behold, they were a little loose - fan especially. They were too shot to tighten so then new belts.
New snug belts charged perfectly, but loaded up the dry fan hub and it locked up in just a little bit of running.

Your belts may be transmitting just enough torque at the higher speed to excite the field.
Slipping belts don't normally make enough heat to actually smoke the belt, but rather they just get a little hot.

The 2 finger/3 finger trick I learned in service school at Cat. Works like a champ.

User avatar
Boss Hog
Cub Pro
Cub Pro
Posts: 10290
Joined: Mon Oct 24, 2005 8:35 pm
Zip Code: 23962
eBay ID: dmb2613
Circle of Safety: Y
Location: VA. Randolph

Re: charging... only at full throttle?

Postby Boss Hog » Wed Jan 09, 2013 6:52 pm

I am betting on the voltage reg!
IN GOD WE TRUST
All others pay cash
Boss Hog
Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg

ntrenn
10+ Years
10+ Years
Posts: 804
Joined: Tue Apr 17, 2012 7:55 pm
Zip Code: 47119
Skype Name: ntrenn
Tractors Owned: 63 Cub 221833 in family since '69
65 Lo-boy 19648 with an un-stuck #4 - it lives!!!
144 Cultivators with disc hillers
193 Plow
42C mower
59L mower mounted on the Fcub
23A Disc - lost possession
Circle of Safety: Y
Location: Indiana

Re: charging... only at full throttle?

Postby ntrenn » Thu Jan 10, 2013 10:06 am

Take the cover off the regulator and while it's running, push down on the contactor tabs one at a time. They should spark when you break contact. If they are closed and not charging, you have a generator problem. Sometimes cycling the tabs convinces everything to work again like it's supposed to. That's one ME solution to an electrical problem....

DeckSetter
10+ Years
10+ Years
Posts: 3
Joined: Thu Dec 27, 2012 5:56 pm
Zip Code: 47320

Re: charging... only at full throttle?

Postby DeckSetter » Mon Jan 14, 2013 4:39 pm

Looks like we have a winner with "SLIPPING BELT".

I did get a little smell out of it..... after it threw the belt off the generator!

Anyone know the correct size belts for generator and fan off the top of their head?

User avatar
Boss Hog
Cub Pro
Cub Pro
Posts: 10290
Joined: Mon Oct 24, 2005 8:35 pm
Zip Code: 23962
eBay ID: dmb2613
Circle of Safety: Y
Location: VA. Randolph

Re: charging... only at full throttle?

Postby Boss Hog » Mon Jan 14, 2013 4:53 pm

22 inches
IN GOD WE TRUST
All others pay cash
Boss Hog
Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg


Return to “Farmall Cub”

Who is online

Users browsing this forum: inairam and 27 guests