BX 1850 RPM's

[F2036]

My BX 1850 has been running great until today. Mowing after a while the RPS's will drop, power is gone and the tractor will almost stall and die then it will come part way back on the RPM's,
I changed both fuel filters thinking that may be the problem but no such luck, it will still lose RPM's even with out a load just like before.
My thinking is that the fuel pump between the fuel filters may be getting tired, I thought I would try that for the next step.
Any other ideas or suggestions would be appreciated.
If it isn't the fuel pump what should I look at next?
Yes it has a third of a tank of fuel, and the air cleaner is snow white and not plugged.

 

[Dave_eng]

My BX 1850 has been running great until today. Mowing after a while the RPS's will drop, power is gone and the tractor will almost stall and die then it will come part way back on the RPM's,
I changed both fuel filters thinking that may be the problem but no such luck, it will still lose RPM's even with out a load just like before.
My thinking is that the fuel pump between the fuel filters may be getting tired, I thought I would try that for the next step.
Any other ideas or suggestions would be appreciated.
If it isn't the fuel pump what should I look at next?
Yes it has a third of a tank of fuel, and the air cleaner is snow white and not plugged.

Suggest you read through this thread on the need for lift pumps and the symptoms as they fail.

Lift pumps

Dave

 

[85Hokie]

when you turn the key before starting.....do you here the "ticking" of the fuel pump?

 

[F2036]

85 Hokie, yes I hear the fuel pump ticking

 

[85Hokie]

If you hear the ticking and it sounds normal....... the next to check is restriction in the flow.

Ride around with the fuel cap loose and see if that makes any difference ......

The fuel tank on the BX is a subeach to get to and or out! AND many people have mentioned that the sending unit rusts and drops all types of stuff to the bottom of the tank.....

YOU can take the hose off at the second filter......... and turn the key and see if it pushes diesel at a constant rate or

get under the ol girl and pull the hose off the first filter and see if it flows in a nice steady stream, not going to come out fast but should be steady - if it stops or hiccups, you have found the problem.

The pump will push it out faster than the gravity flow - but either way it should be a steady flow.

Report back what you find - I do not think it is the fuel pump, but ............

 

[F2036]

This morning i took the fuel line off of the fuel filter by the engine. Turning the key on it pumped a pretty good stream of fuel, then it slowed down and began to match the ticking of the pump, then slowed some more and finally quit.
This afternoon I will remove the fuel line before it gets to the first filter and see what happens.
Besides gettiing another bath in diesel fuel LOL

 

[85Hokie]

This morning i took the fuel line off of the fuel filter by the engine. Turning the key on it pumped a pretty good stream of fuel, then it slowed down and began to match the ticking of the pump, then slowed some more and finally quit.
This afternoon I will remove the fuel line before it gets to the first filter and see what happens.
Besides gettiing another bath in diesel fuel LOL

SO....this sounds like either a vacuum problem......try removing the tank lid and try again - or more than likely a blockage problem in the tank

 

[F2036]

I took the fuel line apart just before the first filter, had just about enough fuel to run to my elbow then it quit. I unscrewed the tank filler cap and no change in flow. With a little blast of air in the line it began to run full stream.
It looks like I get to take the fuel tank off and see what is hiding in there.

 

[armylifer]

Because I have a BX1860 I am interested following this thread because my tractor is almost the same as your model. Please be sure to post back what you find. Pictures would be nice too.

 

[85Hokie]

I took the fuel line apart just before the first filter, had just about enough fuel to run to my elbow then it quit. I unscrewed the tank filler cap and no change in flow. With a little blast of air in the line it began to run full stream.
It looks like I get to take the fuel tank off and see what is hiding in there.

Before you take the tank off - which there are videos online of how to do so,
get cha small piece of wire and bend the end back on itself. make sure the bend is tight enough to allow it to exit - and then probe up the hose and see if anything will follow back down - run it like a snake in a drain. YOU might be able to flush out the "stuff" and save a good deal on having to take the tank off.

 

[F2036]

I did take the tank off, and flushed it out with diesel fuel. I did get a little crud out of it but not much.
While the tank was off I found that some of the wireing was rubbing and wearing in places so I corrected that.
Finally got the tank back on and everything hooked up enough to run, now I can get more RPM's than ever before.
Tractor is back together and ready to rock and roll , right ? Wrong !
Now the fuel shut off solenoid is acting crazy. Sitting still with no load it will let the motor build RPM's and run okay. Try and move the tractor the fuel solenoid starts to act up and wants to shut the motor down, that will be Tuesday's project I think.
I'm not good at takeing pictures, I should probably start to take pictures, so I can remember what goes where when putting back together.

 

[85Hokie]

I did take the tank off, and flushed it out with diesel fuel. I did get a little crud out of it but not much.
While the tank was off I found that some of the wireing was rubbing and wearing in places so I corrected that.
Finally got the tank back on and everything hooked up enough to run, now I can get more RPM's than ever before.
Tractor is back together and ready to rock and roll , right ? Wrong !
Now the fuel shut off solenoid is acting crazy. Sitting still with no load it will let the motor build RPM's and run okay. Try and move the tractor the fuel solenoid starts to act up and wants to shut the motor down, that will be Tuesday's project I think.
I'm not good at takeing pictures, I should probably start to take pictures, so I can remember what goes where when putting back together.

Glad you got problem #1 fixed..... as for the fuel solenoid, with the hood down and you running the machine under load how can you hear or see it acting up? That device is either working or not, I could guess a bad ground or a chaffed wire could cause it to start and stop....

On my bx - as I get off the machine after shutting down, I hear a clear "tick" when it kicks out.

You are not talking about the fuel pump are you? Just asking.......

 

[F2036]

Yes the hood is closed but I have the side panel off.
When I tried to move the tractor out of the shop it bogged down and almost died. When I returned the forward/reverse pedal back to netural then the RPM's slowly built back up somewhat.
With my son watching we noticed the stop solenoid arm working in and out.
When I turn the key off the tractor does not shut down right away, like it used to do. It acts like it is running out of fuel, spits sputters and finally shuts down.
I will check out the wireing and see what I can find.
Thanks for the idea of checking the wireing.

 

[i7win7]

Sounds like the seat safety switch to me. Did you have to remove seat to access tank?

 

[F2036]

I started the tractor today and it ran great!
Everything was running good until I went to shut the tractor off. It wouldn't shut down, I had to manually move the arm on the injection pump to shut the tractor down.
I took the fuel solenoid off and the shaft in it was like it was forzen in place, it was really hard to move the shaft either way. Looks like I'm in the market for a new fuel shut off solenoid.

 

[armylifer]

I started the tractor today and it ran great!
Everything was running good until I went to shut the tractor off. It wouldn't shut down, I had to manually move the arm on the injection pump to shut the tractor down.
I took the fuel solenoid off and the shaft in it was like it was forzen in place, it was really hard to move the shaft either way. Looks like I'm in the market for a new fuel shut off solenoid.

Before you go and spend money to buy a new fuel shut off solenoid you may want to test the one that you took off first. Apply battery to it and see if it operates while off the tractor. Make sure that the polarity to the connection is correct. If the solenoid operates in both directions you probably don't have a bad solenoid. I know that some solenoids are really difficult to move except when battery is applied. I don't know for sure if that is the case with yours but it is certainly worth checking before you buy a new one.

If it does operate normally off the tractor it is likely that you have an open in the wiring on the tractor.

 

[F2036]

I took the solenoid over to a friends shop for him to test. I ended up with a new solenoid today, put it on, fired the tractor up, turned the key off and new solenoid shut the tractor down almost instantly. It been raining the past few days so I couldn't take it outside to mow, with the shop closed up I didn't want to run the tractor very long inside.
Now the next thing is to work some more on the B7100 TLB, I have been replacing bushings, pins, and hoses that need some attention.
Thanks for all the ideas, suggestions and help with this project.