8N -8 volt

[Anonymous-0]

I have a 8N tractor with an 8 V battery and it won"t start without jumping off - runs great once it starts and won"t start again once you turn it off- I"m no mechanic- whats the matter with it?

 

[Anonymous-0]

Bad battery, worn out starter, bad battery cables. Using an 8 volt battery is just a bandaid for not having cared for the starter and the starter circuit. When the worn out brushes and bearings in the starter take 8 volts at the battery to overcome bad connections and wimpy battery cables, it goes on down hill.

A 6 volt generator with a regulator won't properly charge the 8 volt battery either.

Basically it needs (and my 8N needed that nearly 30 years ago) the starter cleaned up with new brushes, a turned commutator, and new bearings (just sleeve bushings in the 8N). It needs FAT battery cable and ground strap with clean connections. Nothing from Walmart's battery kiosk is appropriate for a 6 volt system. Then it needs a good 6 volt battery and probably similar attention to the generator. On the 8N that I had, most of the wiring was shorted out from the insulation having rotted off and the wiring running through that conduit over the engine.

It will start and run fine on 6 volts, but it takes care and good wiring to get there. Battery post and all starter circuit connections need to be clean. These days, I'm applying a bit of silicone dielectric ignition grease to such connections out in the weather to keep that weather out and its making them last a lot longer between cleaning tasks.

Gerald J.

 

[rrlund]

Don't quite understand what you're saying..."jumping off"?? What do you mean? The battery is dead? If it's an 8 volt,you won't get it charged. You have a 6 volt generator and won't find an 8 volt battery charger. You need a 6 volt battery.

 

[Anonymous-0]

The 8v batt will charge with your system with no problem. You dont change anything and it will work. I have worked on systems that have an 8v batt and the sp gravity will be up to spects. You must have something else wrong if it wont start.

 

[2t2@IA]

First and cheapest, I would clean the battery terminals and the cable ends that clamp to the terminals.

 

[IaGary]

Either your battery or your wires are bad, or your charging system is not charging.My guess is battery or the connections.

And yes a 8volt battery will charge with a 6 volt system.

I have a 8 volt in my Farmall 300 and it recharges to about 8.2 volts with a 6 volt alternator. Most generators and alt. put out more than 6 volts just as a 12 puts out 14.5 or more.

That extra 2 volts on the battery spins the tractor better in cold weather.And you don"t need to switch the lights cause 8 volts will not blow a 6 volt bulb.

 

[Bob]

A fully-charged 8-Volt battery will read about 9.6+ Volts. At 8.2, you've got a LONG ways to got to have the 8-Volt battery "charged"!

 

[David, Surrey UK]

(quoted from post at 04:47:47 08/25/07)Most generators and alt. put out more than 6 volts just as a 12 puts out 14.5 or more.

Nominal voltage for lead-acid batteries is 2.0 volts per cell, but the fully charged float voltage is about 2.4 volts per cell. So to charge a 4-cell battery to 100% you'll need 9.6 volts (as Bob says).

The exception to this 2V rule is 28 volt batteries, as used on military and some other vehicles. This 28V is actually the float voltage, not the discharge voltage. They're only 12 cells (e.g. two 12 volt batteries in series), so they should really be called 24V batteries. (Alternatively, car batteries should be called 14V batteries!)

David