JD 6300

Our 6300 loader tractor is causing me grief. It works great loading for short periods- loading, moving stuff, anything non taxing. Usually runs 10 min to 45 min at a time, not really working hard so its no problem.

I hook up the side arm flail mower and mow ditches this time of year. Hydraulics in constant pump and pto engaged for head. I run at about 1700 rpm...a bit under the 540 mark, so it is working now. After about 1/2 hour it starts to struggle and sounds like its running out of fuel. I'm lucky if I can go an hour and not have it stall out, being able to start up again when it cools down.

The last two times I made it back to the yard, shut down and it wont start up again until the next morning. I tried restarting by cracking the injectors but am getting no fuel. I have replaced the fuel filter and housing. Pulled the lift pump / sender unit. Screen good. Good fuel to the fuel filter.
I'm guessing its the injector pump, but why will it do this when it is working, but not under regular use?

Any advice before I tear into this? Thanks, Grant

Possibly the electric solenoid on the injector pump that shuts the tractor down?

If you disconnect fuel line at inj pump and energize lift pump will fuel squirt out of open line??????????

Yes a steady stream of fuel...
I just got back in, I had the fuel tank completely full and this time I had no problems after an hour and a half of hard cutting. This is now leading me to believe that I may be sucking air somewhere if the tank is low?

Still my question is why was there no fuel out of the IP when cranking after the issue yesterday, and no problem starting up when cool.

I will check the electric fuel shut down solenoid as suggested as above...I guess I just need to wait for it to fail again....At least I'm getting my dykes mowed.

Thanks, Grant

Is the fuel tank vent/ cap not venting causing a vacuum to form in the tank as fuel is used. This would starve the fuel delivery system.

Rag or something floating around in the tank, plugging the pick up gauze? Also, maybe try pouring a gallon or two of cold water on the injector pump next time it quits. If it starts up after cooling the pump down you may have a pump problem.

Interesting...Thx I'll try that

Should be good but I will check this too. Thanks

How hot is the coil when it starts to quit? Try the cold water there also.

Don't do that. Just please don't do that. Only do that after you've exhausted all other avenues, and be ready to potentially give up all core value on that pump when you crack the housing. It has happened before. If that's the problem, and it sounds like it may possibly be, the pump needs to be rebuilt. DO NOT BUY A REMAN SELECT FROM JD. Take it to a reputable shop and have it rebuilt. If a blanket statement had to be made regarding pouring cold water on hot inj. pumps, it would be 'Don't pour cold water on hot pumps, period.'

Diesel. I thought the same thing. If the intake from the tank gets partially plugged, it will work well until it needs full flow to keep up. Jim

If it ran well with full tank of fuel,does the pick up tube for supply pump go down thru top of tank-if so may have cracked pick up tube.Mark

This sounds an awful lot like the problem I am having with my 6410. You can see the thread over on ag talk machinery thread.

I'll reply to everyone here...I did not pour any water on the IP or any thing else Farmer Boy. JD, I couldn't find your thread on Ag Talk... but good site like this one.

Now what I did do was fill the fuel tank right up and blew the cap out with compressed air, cleaned the vents?

I ran it for another couple hours twice more this afternoon, and it worked hard. Wrapped up some good blackberries and a 4' chunk of rebar attached to a slab of broken concrete in the weeds. It ran well and never once began to shudder and run rough.

I think this is back to the tank and the fuel pump assembly inside. While I get fuel to the filter, a bit of air did come out after the stall/shut down. I will run this tractor down on fuel and see if it runs rough / poor under load. My guess is I will be replacing the pump assembly and probably cleaning the bottom of the tank.

Thanks for everyone help and thoughts. I'll repost when it gets low on fuel when mowing next week. Grant
I will keep the test light with me for the fuel shut off too. I have 12 volts there now when running. I need to wait for it to stall to see if there is an electric s/o issue too.