BX2200 Electrical Problem

[Tom_H]

Yesterday, when I went to crank, I noticed the glow plugs didn't come on. It still cranked though, but I noticed the fuel and temp. gauges weren't working. Today I checked the fuse, which was blown, and replaced it. Glow plugs worked and it cranked. Gauges didn't work. Turned it off and back to glow plug position-they didn't come on, which told me fuse was blown again. I went ahead and worked with the Woods backhoe for several hours and the engine stopped as it would when out of fuel, but much more quickly-within 2 or 3 seconds as opposed to 10 or so. I couldn't tell how much fuel was in it so I added a few gallons. I let it sit for awhile and when I went to crank, it acted like it was sucking fuel for awhile without any combustion. It then began firing some, like it does when refueled after being empty. When I let the key go, it stopped instantly, just as though I had turned the key to off. I cranked it again and held the key at "start" for a good 2 or 3 seconds after the cylinders began firing and let the rpm build up. When I let go, it stopped dead instantly again.

I am thinking there might have been a short in the switch that caused the fuse to blow after i moved the key from the glow plug position to the start position. The problem maybe worsened and now when the key is in the "on/run" position, the switch sends the same signal to the solenoid that it normally does when turned to the "stop" position.

Does this sound reasonable, or does anyone have other thoughts?

Thanks in advance.
Tom

 

[dodge man]

There is a small lift pump. I bet that isn't getting power either and that is why it won't stay running. I haven't a clue as to why the fuse is blowing, it could be a lot of things, such as a short some where.

 

[radioman]

Sounds like a short. are you sure you getting feul to cylinders? what it sounds like to me is the shutoff solenoid has a short maybe and its closing and opening on its own. It sure would explain half of the problems you are having. I think a simple test would be disconnect the shutoff and test again. BE SURE you can reconnect the soleniod connection while still running safely so you can shut down the engine.

 

[Tom_H]

are you sure you getting feul to cylinders?

Yes, at first the crankshaft was turning with no combustion, but then the cylinders began firing louder and louder. The engine was running (full combustion on all cylinders) as long as I held the key @ the start position. When I released the key back to the run position, there was instant shutdown, just as there would be if I had turned the key to the off position.

 

[milkman]

Try pulling the screen off below the dash and on the right side there is a fuse block, one of the fused is for the fuel shutoff solenoid, this fuse is bypassed when the key in in start position so it will run when held in the start position even if the fuel solenoid fuse is blown. Hope I'm remembering correctly.

 

[Tom_H]

Try pulling the screen off below the dash and on the right side there is a fuse block, one of the fused is for the fuel shutoff solenoid, this fuse is bypassed when the key in in start position so it will run when held in the start position even if the fuel solenoid fuse is blown. Hope I'm remembering correctly.

I already had checked all of those, the only one blown was the one to the glow plugs, temp gauge, and fuel gauge. It was blown earlier, but the tractor would start and run. After the tractor conked out, I checked all fuses again; it still is the only one blowing. Each time I replace it, the glow plugs will come on. Regardless of whether I have replaced the fuse or not, when I turn to "start", the starter will still turn the crankshaft and combustion will begin in the cylinders, but everything stops when the switch is allowed to rock back to "run".

 

[SeymourBota]

Last summer I had to replace the ignition switch in my BX2200.

I think the glow plugs worked and it would crank and try to start but then stall.

I could turn the key and not hear the fuel pump run- a sure sign.

I'm betting it's a $55 ignition switch.

 

[Tom_H]

Last summer I had to replace the ignition switch in my BX2200.

I think the glow plugs worked and it would crank and try to start but then stall.

I could turn the key and not hear the fuel pump run- a sure sign.

I'm betting it's a $55 ignition switch.

When the key is in the position for the glow plugs to preheat, is that fast, not very loud knocking sound the fuel pump? What you describe is what I am experiencing: when I turn the key to the glow plug position, it does not make that sound.

Did you have to take your tractor in to the shop? Did they do a field repair, or did you make the repair yourself?

 

[SeymourBota]

Yes, it's a clicking sound.

You don't need to do it in a shop. The switch is plug and play. Just use a set of offset pliers to hold the outside ring while you unscrew the old switch.

5 minute job. p/n 66101-55200

 

[Tom_H]

It sounds like that switch is bad, just like yours was. Whether the blowing fuse is due to that or something else remains to be discovered. I haven't found any frayed wires anywhere, but the svc. mgr. says it could be from a bad relay. They hope to send a mechanic to the wet field where the tractor is stranded (poured rain all day on the clay field today) on Fri. I am wondering if I should try taking the switch off and in to the shop and see if they can test it. If bad, I could bring a new one back, install it myself. Maybe that would get the tractor started. If it starts, but the fuse is still blowing, I might be able to get it on the trailer and to the shop myself (unless the fuse prevents the fuel pump from sending fuel). Hmmm, any thoughts from anyone???

BTW-this fuel pump is completely separate from the injector pump, isn't it?