BX 23, sputtering and hard/won't start

[dougtrr2]

Trouble shooting electrical. Start simple, make sure every ground connection is good, don't just look, remove, clean and reattach.

Doug in SW IA

 

[Smokeydog]

CorrosionX is wiring’s connectors best friend. Also for threaded fasteners. Favorite for welding bench, tools, blacksmith tooling, campers and boats(particularly saltwater).

Be sure to clean and tighten battery grounds if having relay trouble.

 

[CobyRupert]

Anybody else find it very weird that you need voltage present to turn the tractor off? That’s opposite of everything I know about fail-safe circuits. A failure means you lose control to cut power (fuel).

Does this mean if the alternator fails and drains the battery (below the threshold voltage of the solenoid) , there’s no way to turn the tractor off?

Imagine if the PTO switch works the same way and you needed an emergency shutdown, but a loose wire or low voltage means you can’t shut it off. That’s nuts!

I’m not denying that’s it’s designed that way. My wife has a Subaru and I’ve experienced conscious design decisions (committee approved) that are absolutely horrendous and defy common sense.

 

[TractorTech]

I found this strange too. That is what I found on a BX23 that had blown the fuse in this circuit AND the fuse is not part of the fuse panel, but rather on the harness near the starter.
My customer called up and said he couldn't turn the engine off. The injection pump (of I could describe where it was to him over the phone) is difficult to access. To get the tractor to shut off, I told him to idle the engine, put it in high range, stand on the brakes and stomp on the hydro pedal. This killed the engine.
Very strange design indeed!

 

[JWR]

Anybody else find it very weird that you need voltage present to turn the tractor off? That’s opposite of everything I know about fail-safe circuits. A failure means you lose control to cut power.

Does this mean if the alternator fails and drains the battery (below the threshold voltage of the solenoid) , there’s no way to turn the tractor off?

Imagine if the PTO switch works the same way and you needed an emergency shutdown, but a loose wire or low voltage means you can’t shut it off. That’s nuts!

I’m not denying that’s it’s designed that way. My wife has a Subaru and I’ve experienced conscious design decisions (committee approved) that are absolutely horrendous and defy common sense.

Yeah, verily ! I guess the idea is that, while it is running, you have voltage to work with. When you turn the switch Off you still have voltage and probably will have it (almost certainly) for the 6 seconds until the relay times out and shuts off fuel. But that has to be an ass-backward way of doing things ! Why would they do that ? We will never know.

 

[K5lwq]

Yeah, verily ! I guess the idea is that, while it is running, you have voltage to work with. When you turn the switch Off you still have voltage and probably will have it (almost certainly) for the 6 seconds until the relay times out and shuts off fuel. But that has to be an ass-backward way of doing things ! Why would they do that ? We will never know.

You should not have power to the solenoid while key is on. You would have it at the timer relay. When you turn the switch off the timer sends power to the solenoid for 6 seconds to kill the engine. Hope that makes better sense.

 

[JWR]

You should not have power to the solenoid while key is on. You would have it at the timer relay. When you turn the switch off the timer sends power to the solenoid for 6 seconds to kill the engine. Hope that makes better sense.

Yes, I did not read it that way. Tks.

 

[CobyRupert]

I found this strange too. That is what I found on a BX23 that had blown the fuse in this circuit AND the fuse is not part of the fuse panel, but rather on the harness near the starter.
My customer called up and said he couldn't turn the engine off. The injection pump (of I could describe where it was to him over the phone) is difficult to access. To get the tractor to shut off, I told him to idle the engine, put it in high range, stand on the brakes and stomp on the hydro pedal. This killed the engine.
Very strange design indeed!

Where’s the air intake? And shape of?

People have also placed something over the intake to choke a diesel off.

Somewhere I’d expect there’s a relay that fires a signal to the fuel solenoid, based on key position. I’d want to know if this relay is doing what it’s suppose to, along with if the signal coming into it from the key switch (or wherever) are what they’re suppose to be.