Kubota B7300 tractor question

NavyDoc · #1 02/18/13, 06:33 PM

not sure if anyone can help but I have a Kubota B7300 tractor. It died on me and I cant get it started. Thought it might be the battery so I pulled it off and put it on my charger. That didnt help. Then thought (since Ive had problems with my Taurus) it might be the starter (since I didnt get the "click" of the starter). Thats not it. Someone suggested I just jump across the poles on the starter but when I did that I got a hiss from the negative terminal of the battery. Anyone experience/know what this means? is it something that I can fix myself? ANY help is most appreciated.

k9 · #2 02/18/13, 07:20 PM

Clean the cable connections.

jwal10 · #3 02/18/13, 07:20 PM

Do you have a good terminal on the ground side? If it hisses, either the cable is bad or there is not good contact between the battery post and terminal....James

Fire-Man · #4 02/18/13, 07:23 PM

Quote:

Originally Posted by NavyDoc

not sure if anyone can help but I have a Kubota B7300 tractor. It died on me and I cant get it started. Thought it might be the battery so I pulled it off and put it on my charger. That didnt help. Then thought (since Ive had problems with my Taurus) it might be the starter (since I didnt get the "click" of the starter). Thats not it. Someone suggested I just jump across the poles on the starter but when I did that I got a hiss from the negative terminal of the battery. Anyone experience/know what this means? is it something that I can fix myself? ANY help is most appreciated.

OK, you said it "died on me" to me that means you were using it and it cut of and will not restart. That could be alot of things. Now if you got on it and tried to start it and it does nothing and your battery checks good I would check my neutral switch if yours has one. My switch acted up and I could wiggle my netural shifter and could get it to start, but over time it got bad enough I had to repair it.

You said "jump across the poles on the starter"---how many poles you got on your starter? If you jumped from the positive post of your battery to the post on the starter and the negative post hissed----you got a bad connection on the negative post. Good Luck!

am1too · #5 02/18/13, 08:11 PM

I assume it will crank. I assume it has fuel to the cylinders. IOW the injectors are working.

Don't laugh to hard but as a youngster I ran my car out of gasoline and could not figure out why it would not run. From a family of mecanics too.

Had the car towed to the dealer and they spent a day trying to figure it out. They finally checked the gas gaguge. I think they were more embarrassed than me.

NavyDoc · #6 02/18/13, 08:39 PM

there is desiel in the tank (not out of gas). jumped across the terminals on the starter (bypass the cylinoid) and the hiss is comeing from the negative terminal on the battery (cable or the terminal not sure which could be bad....I have two batteries and it happens on both). where the negative cable touches the frame (to ground it) is super corroded (cant get the old cable off the frame but its not hissing there....its at the terminal). There are two nuts/screws on the starter. when I was advised to "jump the poles" I assumed to take a piece of metal and go between the two nuts/screws on the starter

NavyDoc · #7 02/18/13, 08:41 PM

am1too...it wont crank. from time to time I get a "click" from the starter but at other times I get nothing which is why I was advised to try to "jump" between the starter poles/terminals

farmrbrown · #8 02/18/13, 10:33 PM

Quote:

Originally Posted by NavyDoc

there is desiel in the tank (not out of gas). jumped across the terminals on the starter (bypass the cylinoid) and the hiss is comeing from the negative terminal on the battery (cable or the terminal not sure which could be bad....I have two batteries and it happens on both).

where the negative cable touches the frame (to ground it) is super corroded (cant get the old cable off the frame but its not hissing there....its at the terminal).

There are two nuts/screws on the starter. when I was advised to "jump the poles" I assumed to take a piece of metal and go between the two nuts/screws on the starter

That sounds like a likely spot to start. If you don't have a good connection for your ground, the juice won't get to the starter. Same thing just happened to my truck, just took a few minutes to fix.

NavyDoc · #9 02/19/13, 08:32 AM

Quote:

Originally Posted by farmrbrown

That sounds like a likely spot to start. If you don't have a good connection for your ground, the juice won't get to the starter. Same thing just happened to my truck, just took a few minutes to fix.

since it is a diesel there is a warmer/heater? I get power to the dash lights but the starter does not give the click like its trying to start. unfortunately where the negative terminal connects to the frame is rusted and I cannot remove/clean off that connection point.

o&itw · #10 02/19/13, 11:13 AM

First take a set of jumper cables and using only one side of them hook it between the negative post on the battery and a good solid piece of iron on the tractor frame. If it starts OK then, you will need to replace that existing cable that is hooked between the post and the frame. If you have a voltmeter, connect it across the posts of the battery it should read at least 12 volts. If it does, try starting the tractor while the voltmeter is across the posts, it should sag down a few volts, but if it goes down to only a few, you have a bad battery. Actually, the very first thing you should probably do is, try to jump the tractor from a battery on your car or truck. Again, if the tractor starts, you probably have a bad battery.

If you don't have a set of jumper cables, get one... a homesteader shouldn't be without them.

Bearfootfarm · #11 02/19/13, 01:10 PM

Quote:

where the negative terminal connects to the frame is rusted and I cannot remove/clean off that connection point.

I think that may be your problem

Fire-Man · #12 02/19/13, 01:32 PM

Quote:

Originally Posted by NavyDoc

where the negative cable touches the frame (to ground it) is super corroded (cant get the old cable off the frame but its not hissing there

Well get you a new cable and move it to another location for the ground and cut the old one loose. As already stated several times, a hissing sound is a loose connection---you need to clean this end and battery post and put it back on and retighten----if it will not tighten, put a new end on it. These problems might not even be related to why it will not crank, but these problems are problems and need to be fixed.

am1too · #13 02/19/13, 08:08 PM

Quote:

Originally Posted by NavyDoc

there is desiel in the tank (not out of gas). jumped across the terminals on the starter (bypass the cylinoid) and the hiss is comeing from the negative terminal on the battery (cable or the terminal not sure which could be bad....I have two batteries and it happens on both). where the negative cable touches the frame (to ground it) is super corroded (cant get the old cable off the frame but its not hissing there....its at the terminal). There are two nuts/screws on the starter. when I was advised to "jump the poles" I assumed to take a piece of metal and go between the two nuts/screws on the starter

Having fuel in the tank does not mean it get to the cylinders. Diesels have a very powerful injector pump. Pull an injector to see if it emitts fuel. It seems that the engine turns over. Has it ever over heated? My B7500 has a very powerful fan sucking air through the radiator. I have had to stop and clean the screen to keep from over heating. I have to watch it very closely when brush hogging.

Oh get some baking soda water on that electric connection till the corrosion is gone and grease it. You will need to spray and flush till clean. It is clean when there is no more fizz. I do not mean to insult you.

am1too · #14 02/19/13, 08:20 PM

Quote:

Originally Posted by NavyDoc

am1too...it wont crank. from time to time I get a "click" from the starter but at other times I get nothing which is why I was advised to try to "jump" between the starter poles/terminals

Can you turn the engine over some other way? It helps if it is a manual and not a hyrdostatic drive train. You may have a vapor lock. It happened to me when I drove a big rig. Lots of ether in the breather while turing it over to start it. Not much fun. If a manual vapor lock can be over come by pulling and poping the clutch like a gas engine.

am1too · #15 02/19/13, 08:23 PM

Quote:

Originally Posted by NavyDoc

since it is a diesel there is a warmer/heater? I get power to the dash lights but the starter does not give the click like its trying to start. unfortunately where the negative terminal connects to the frame is rusted and I cannot remove/clean off that connection point.

Use a hammer and cold chisel or a grinder (done that too) and replace bolt. If necessary drill new hole.

am1too · #16 02/19/13, 08:26 PM

Quote:

Originally Posted by o&itw

First take a set of jumper cables and using only one side of them hook it between the negative post on the battery and a good solid piece of iron on the tractor frame. If it starts OK then, you will need to replace that existing cable that is hooked between the post and the frame. If you have a voltmeter, connect it across the posts of the battery it should read at least 12 volts. If it does, try starting the tractor while the voltmeter is across the posts, it should sag down a few volts, but if it goes down to only a few, you have a bad battery. Actually, the very first thing you should probably do is, try to jump the tractor from a battery on your car or truck. Again, if the tractor starts, you probably have a bad battery.

If you don't have a set of jumper cables, get one... a homesteader shouldn't be without them.

There may be a blown fuse. I have had a main fuse blow. A blown main fuse will allow every thing else to work and not allow the starter to work. But the problem occured while it was running. Diesels do not require electricity while running.

am1too · #17 02/19/13, 09:06 PM

Quote:

Originally Posted by NavyDoc

not sure if anyone can help but I have a Kubota B7300 tractor. It died on me and I cant get it started. Thought it might be the battery so I pulled it off and put it on my charger. That didnt help. Then thought (since Ive had problems with my Taurus) it might be the starter (since I didnt get the "click" of the starter). Thats not it. Someone suggested I just jump across the poles on the starter but when I did that I got a hiss from the negative terminal of the battery. Anyone experience/know what this means? is it something that I can fix myself? ANY help is most appreciated.

Why did it die? I sometimes over load an engine and kill it.

How many hours does it have on it?

I already asked if it over heated.

You could pull the starter and test it easy enough.

Since it died while in use I doubt it is vapor locked. But could become so in the restart.

The injector pump could be shot. Or blocked injectors from contaminated fuel.
Is there any signs of water in the fuel filter? My B7500 has a clear fuel bowl. Water will block them.

Get good connections for your electrical gear. As I suggested replacing the rusted bolt connection. Clean the corrosion with damp baking soda or spray soda solution on it.

How long have you owned it?

fordy · #18 02/20/13, 08:56 AM

Quote:

Originally Posted by NavyDoc

there is desiel in the tank (not out of gas). jumped across the terminals on the starter (bypass the cylinoid) and the hiss is comeing from the negative terminal on the battery (cable or the terminal not sure which could be bad....I have two batteries and it happens on both). where the negative cable touches the frame (to ground it) is super corroded (cant get the old cable off the frame but its not hissing there....its at the terminal). There are two nuts/screws on the starter. when I was advised to "jump the poles" I assumed to take a piece of metal and go between the two nuts/screws on the starter

................That engine probably has a 'Low' oil shutdown sensor on the engine !!?? A short in the electricial system is capable of shutting down the engine because it has an Electricial fuel pump , otherwise the engine is quite capable of running without any electricial power at all . , fordy

am1too · #19 02/20/13, 10:04 AM

Quote:

Originally Posted by fordy

................That engine probably has a 'Low' oil shutdown sensor on the engine !!?? A short in the electricial system is capable of shutting down the engine because it has an Electricial fuel pump , otherwise the engine is quite capable of running without any electricial power at all . , fordy

I have not looked at my injector pump. The fuel is gravity flow to it. I thought all injector pumps were mechanically driven.

Snow here today. It just stopped BTW. Sure is pretty.

OkieDavid · #20 02/20/13, 06:27 PM

Don't have anything constructive to add beyond mentioning another message board for your consideration. If you own "orange" I encourage you to check out orangetractortalks dot com. Good site for those sometimes persnickety orange beasts.