1951 farmall cub

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johnthomas
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1951 farmall cub

Postby johnthomas » Wed Feb 28, 2018 6:05 pm

I inherited this tractor which was serviced every year the owner was alive.It sat for 10 years in a dry garage with no fuel in tank. I installed a battery and nothing..no lights ,no crank, silence. any suggestions would be greatly appreciated.
Thanks,
John

tst
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Re: 1951 farmall cub

Postby tst » Wed Feb 28, 2018 6:53 pm

welcome to the forum, it is a 6 volt POSITIVE ground tractor, no power probably bad connections on the battery cables, check both ends

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Willy
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Re: 1951 farmall cub

Postby Willy » Wed Feb 28, 2018 7:19 pm

Welcome to the forum and 1951 was a very good year for Cubs. Since it won't crank, I'm thinking something with the battery too. 6 volts are a bit more fussy than 12 volts about connections. And like tst mentioned, don't forget it's positive + ground.
Waking up the ol' Cub

Nah, it's not leaking oil. It's just marking it's territory.

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ricky racer
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Re: 1951 farmall cub

Postby ricky racer » Wed Feb 28, 2018 7:24 pm

Prior to start up you'll need to prime the oil pump. You can do a search here to find out how.

Check your ground connection.
1929 Farmall Regular
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub

staninlowerAL
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Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
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Re: 1951 farmall cub

Postby staninlowerAL » Wed Feb 28, 2018 8:12 pm

Can the crankshaft be turned with the fan. hand crank or prybar at the flywheel?

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Re: 1951 farmall cub

Postby Smokeycub » Thu Mar 01, 2018 8:23 am

Hi and welcome to the best Cub site around. As others have said check all the cable connections particularly the ground cable at/in the battery box or were ever yours is connected (previous owners will move things around). The cleaner the connections the better when dealing with 6 volts. If it still uses a pull rod for the starter the switch itself could be suspect after 10 years. Good luck!
Ray
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Stanton
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Re: 1951 farmall cub

Postby Stanton » Thu Mar 01, 2018 8:36 am

Welcome to the forum!

If you're going to be cranking on the engine, better remove each spark plug and put about a tablespoon of motor oil into each hole to provide some lubrication w/o scarring your cylinders.

Here's another thread discussing how to prime the oil pump: http://www.farmallcub.com/phpBB2/viewtopic.php?f=1&t=92801&p=765604&hilit=priming+oil+pump#p765604
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Larry in WNY
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Re: 1951 farmall cub

Postby Larry in WNY » Thu Mar 01, 2018 9:18 am

I agree with the other posts. My Cub sat for 10+ years and the positive ground was bolted to the side of the battery box. For a test I ran a new ground cable to a bolt near the toolbox. Turned over good after that. I will attach another cable from the battery box ground bolt to the frame so I can put the battery box cover back on.

Larry

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Glen
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Re: 1951 farmall cub

Postby Glen » Fri Mar 02, 2018 9:09 pm

Hi,
If the engine hasn't been run in several years, you should prime the oil pump, if it loses it's prime sitting, then there is no oil pressure when the engine is running. It is common for them to lose the prime sitting for years.
Engine damage can happen if you run it with no oil pressure.

Below is a picture of where the hole is that I use for priming the oil pump. Just remove the oil filter top, and oil filter, and it is easy to see, use a light if you need to.
I fill a clean oil can with motor oil, and pump it into the hole, you might need more than one filling of the oil can to fill the passages in the engine.
Put the oil filter and cover on before starting the engine.
Watch the oil gauge after starting, it takes 15 - 20 seconds for the gauge to show pressure, it has to fill the oil filter housing before the gauge will show pressure.

A used Cub usually needs a good tune up, like cars with distributors needed years ago.
If it has low power, the timing could be wrong. Set the timing with a timing light.
The ignition points, distributor cap, rotor, spark plugs, spark plug wires, all have to be good, and need replacing if not in good condition.

If you check or change the Touch Control fluid, the Cub owner's manual says fill the Touch Control up to the filler plug hole, only with the arms in the rear or down position. The fluid goes up in the unit as the arms go to the rear. There is an airspace in the top of the unit. If you fill it with the arms ahead, you will overfill the unit. If you filled it up to the filler plug hole with the arms ahead, remove the filler plug, run the engine, move the Touch Control lever to the rear, and let the excess fluid run out.
The Cub owner's manual tells how to change the Touch Control fluid.

You should check or change all the oils, and be sure they are not low. The owner's manual tells how.

Below is the 1955 Cub owner's manual, the experts on here recommend that everyone with a Cub read it. It has much info about operation, maintenance, and lubrication. There is a table of contents on page 1. There are 2 pages gone in the lubrication section, pages 19, and 20, so use the lubrication info in another year of Cub owner's manual to see the missing info.
This manual shows the same electrical system that a 1951 Cub would have originally had. :)

http://farmallcub.com/rudi_cub/www.clea ... index.html
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Cub oil filter.jpg

johnthomas
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Re: 1951 farmall cub

Postby johnthomas » Tue Mar 06, 2018 12:32 pm

Thanks for all the comments really appreciate it. I noticed that there is a fuse behind the ignition switch will examine that also.

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Stanton
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Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
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Location: Lone Jack, MO

Re: 1951 farmall cub

Postby Stanton » Tue Mar 06, 2018 1:25 pm

johnthomas wrote:Thanks for all the comments really appreciate it. I noticed that there is a fuse behind the ignition switch will examine that also.


Take some time and read through a few threads to acquaint you with the Forum:

Now that you have 2 posts, you can access all the free PDF downloads in the Manuals section. They are located via "Quick Links" in the upper left corner of your screen. Hit that and a pull-down appears where you'll find "PDF Manuals". Through that link, you'll be able to download an Owner's Manual (very strongly recommended) and any service manuals that interest you. Implement Manuals are also available.

Glad you joined us.
Stanton
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staninlowerAL
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Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
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Re: 1951 farmall cub

Postby staninlowerAL » Tue Mar 06, 2018 1:46 pm

johnthomas wrote:Thanks for all the comments really appreciate it. I noticed that there is a fuse behind the ignition switch will examine that also.

You should find a wiring diagram in the owners manual. The fuse you see behind the dash on the light switch is part of the charging/lighting system and not part of the starting circuit of the tractor (if it has not been changed sometime in the past). An inline fuse may have been added. Original wiring had the electrical supply connection at the starter switch connection, probably about a 12ga wire.

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AL Farmall Boy
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Re: 1951 farmall cub

Postby AL Farmall Boy » Tue Mar 06, 2018 2:37 pm

Post pictures of your tractor. It would be nice to see it and also helpful in case things might have been changed around.
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johnthomas
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Re: 1951 farmall cub

Postby johnthomas » Wed Mar 07, 2018 1:55 am

Thank you.I will post some pics in the near future.I look forward studying your forum and will continue reading service manual. So far am impressed with the way this machine is engineered, Really amazing ...built like a tank.

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Willy
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Re: 1951 farmall cub

Postby Willy » Wed Mar 07, 2018 9:49 am

Built like a tank and to where most farmers could figure out how to fix it themselves. Sheer mechanical beauty.
Waking up the ol' Cub

Nah, it's not leaking oil. It's just marking it's territory.


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