farmal m turns over super slow

ronba · Jul 31, 2011

My m turns ovey slow. The batteryis new and the starter is rebuilt. Connections and ground is good. Also tried another starter that I knew was good. Now I know a little about working on tractors but Im guessing that I have a draw on voltage somewhere. Im wondering if the battery cabels are not heavy enough? Tractor runs like a top when it turns over enough to start. Any help would be appreciated. Thank you and have a great weekend. Ron

Pete_5959 · Jul 31, 2011

What is the voltage at the starter when you are trying to turn over. I assume you are still using a 6V system and no one has messed with the timing. Voltage should be darn near 6V. I use double ott welding cable to make my battery cables with correct sized solder on type terminals. The 6V battery will spin the motor even in cold temps.

El Toro · Jul 31, 2011

Do as Pete suggested and use 00 battery cables and don't have them any longer than necessary. Clean all areas until shiny where your cables connect that includes where the battery is grounded. Hal

oldtanker · Jul 31, 2011

You may need to insure the stater mounting are is clean too.

Rick

mkirsch · Jul 31, 2011

If you have a "draw on voltage somewhere" you can quickly and easily measure it with a voltmeter. Your battery should show significantly lower voltage when it's connected to the tractor than when it isn't.

Frankly, I don't think that's your problem. A heavy dead short is the only draw on the tractor that could be significant enough to cause slow cranking. If you had a heavy dead short, you'd know it because the battery would get hot very quickly, and/or you could see wires smoking.

I know you THINK your connections are good, but I still think there's work to do there. Are all the cables new? What gauge? Are they old cables with temporary/repair ends?

Connections include the battery end to the cable, not just the battery post.

Brownie 450 · Jul 31, 2011

Can you turn the engine over with the crank? How hard to turn---as in bearings/ pistons tight? Any other drag on the engine?

teddy52food · Jul 31, 2011

Any cables or connections getting warm? Good place to find the trouble.

CNKS · Jul 31, 2011

For me that is usually a cable problem. Corrosion gets under the insulation where it is not visible. Happened to me at least twice with clean and tight connections everywhere. You might consider replacing them.

Tom Fleming · Jul 31, 2011

In addition to what others have already suggested, there is another issue that I just fixed for someone. They had their starter rebuilt. Put it on the tractor and it barely turned it over. I made them up new cables, soldered conntections, the whole works. Same result. I even made up a temp cable for ground and ran it from the positive post on the battery to the mounting bolt on the starter. Same result. Checked out the new switch on top of the starter, all good.

So, I opened up the starter, and low and behold, the brushes had NO SPRINGS. Uh, DUH to the place that rebuilt it. I corrected the issue, and told the person to go back to the place he had it rebuilt and slap the guy.

What I am trying to say is that you may also want to check that the brushes are making good contact on the armature.

Nebraska Cowman · Jul 31, 2011

If it's 6 volts you guessed your own problem. The cables are not heavy enough. I worked for an old school mechanic starting out. He always said that when car makers went from 6 to 12 volt systems they "stole half the copper out of you car" I guess he's right cuz they never lowered the price.

heavyhaulertoo · Jul 31, 2011

Some times the rebuilt is not up to standerd's

RedRoundhead · Jul 31, 2011

In addition to the other great suggestions, if the machine has a "push type" contactor for the starter, the contact areas of the switch is sometimes burned/corroded. I have taken a number of those apart, resurfaced them, and reinstalled. They then work. Real common on Ford 9N's, for some reason. Best of luck!

farmal m turns over super slow

ronba

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