When I turn the key the lights all light but when I turn the key all the way the lights go out and nothing happens. It's a brand new Kubota battery.
B1750 won't start
- Thread starter tom 120
- Start date
kubotasam
Well-known member
Equipment
B2410, B7100dt, B7500,Woods BH750,Landpride 2660RFM, Tiller, B2781 Snowblower
Sounds like dirty or corroded connections to me. Did you clean the inside of the cable clamps before installing the new battery? If yes then check the other end of the cables. Positive where it bolts to the starter or solenoid and negative where it bolts to the chassis. Remove them and wire brush till they are very clean. Also the cables can corrode inside under the insulation.
Tom,
It **sounds** like a neutral safety switch issue to me. There is likely one on the PTO lever, the seat, the clutch and sometimes on the emergency brake. Need to check each one to make sure they are operating correctly and haven't become detached or damaged. At the very least, try wiggling each of the levers while holding the key in the start position to see if she cranks.
Assuming the neutral safety switches are fine and you know with 100% certainty that they are not the problem, then I'd proceed as follows:
First thing I'd look for is a blown fuse either in a fuse panel or inline with the wire that runs down to the starter.
Next, jump a small wire from where the positive battery cable attaches to the starter solenoid to where the other small lead attaches to the starter solenoid. If the solenoid and starter are good, the engine will crank. If it doesn't then you have a bad solenoid or starter.
Assuming the engine cranks, then follow the small wire back to the key switch or start relay. Often if the tractor has been stored outside, the key switches end up going bad. Look carefully at the terminals on the back side of it to see if they are corroded or have loose wires.
The next test you can do is to jump from the positive battery terminal to where that wire that runs to the solenoid connects to the key switch or relay. (make sure you reconnected the wire to the solenoid that you disconnected in the above step). If the engine cranks when you jump to that terminal, you know the wire is good to the solenoid. If not, then you need to follow it to figure out if there is a fuse or break in the wire.
Finally, some of the models have a starter relay. Those also go bad. To determine if the relay is bad, you need to figure out if it's getting power from the key switch when the key is turned. You'd use a multimeter for this with the black lead attached to ground someplace, and the red lead attached to the power feed wire that runs from the switch to the relay. If you turn the key and it feeds juice to the relay and the starter doesn't crank, then the relay is suspect.
Again, check the neutral safety switches very carefully. They are usually wired in series and when they're all closed they provide the ground for the start relay. If one is open, the relay won't engage because it doesn't have a ground. This might lead one to think the relay is bad when it really isn't.
I don't have a schematic for your model tractor, so I don't know for sure if yours is wired this way or not. The instructions above are me winging it, but they will help you determine where the problem is.
Finally, you can order a manual online from here:
http://www.messicks.com/Wiki/Kubota/B1750.aspx
Hope this helps,
Steve
It **sounds** like a neutral safety switch issue to me. There is likely one on the PTO lever, the seat, the clutch and sometimes on the emergency brake. Need to check each one to make sure they are operating correctly and haven't become detached or damaged. At the very least, try wiggling each of the levers while holding the key in the start position to see if she cranks.
Assuming the neutral safety switches are fine and you know with 100% certainty that they are not the problem, then I'd proceed as follows:
First thing I'd look for is a blown fuse either in a fuse panel or inline with the wire that runs down to the starter.
Next, jump a small wire from where the positive battery cable attaches to the starter solenoid to where the other small lead attaches to the starter solenoid. If the solenoid and starter are good, the engine will crank. If it doesn't then you have a bad solenoid or starter.
Assuming the engine cranks, then follow the small wire back to the key switch or start relay. Often if the tractor has been stored outside, the key switches end up going bad. Look carefully at the terminals on the back side of it to see if they are corroded or have loose wires.
The next test you can do is to jump from the positive battery terminal to where that wire that runs to the solenoid connects to the key switch or relay. (make sure you reconnected the wire to the solenoid that you disconnected in the above step). If the engine cranks when you jump to that terminal, you know the wire is good to the solenoid. If not, then you need to follow it to figure out if there is a fuse or break in the wire.
Finally, some of the models have a starter relay. Those also go bad. To determine if the relay is bad, you need to figure out if it's getting power from the key switch when the key is turned. You'd use a multimeter for this with the black lead attached to ground someplace, and the red lead attached to the power feed wire that runs from the switch to the relay. If you turn the key and it feeds juice to the relay and the starter doesn't crank, then the relay is suspect.
Again, check the neutral safety switches very carefully. They are usually wired in series and when they're all closed they provide the ground for the start relay. If one is open, the relay won't engage because it doesn't have a ground. This might lead one to think the relay is bad when it really isn't.
I don't have a schematic for your model tractor, so I don't know for sure if yours is wired this way or not. The instructions above are me winging it, but they will help you determine where the problem is.
Finally, you can order a manual online from here:
http://www.messicks.com/Wiki/Kubota/B1750.aspx
Hope this helps,
Steve
Last edited:
Tom,
A little more info. Looking at the parts diagram, on the left side of the tractor under the starter you should find a connector that looks to just be a little loop. That wire is a fusible link. You need to check it with your multimeter to see if it has continuity.
Also, it appears the only neutral safety switch on your tractor is actuated by the clutch. I'm not seeing one for the seat or pto. However, I do see what Kubota calls a "combination switch" up near the dash but not sure what it does. Hence, if your pto is electrically actuated, then play with that switch.
Finally, there are two 15 amp fuses in the circuit. They look to be up under the dash area. Check to see if they're good.
You can go to www.kubota.com, click on "Parts" then "Illustrated Parts List." Accept the terms and enter your tractor model. PIck which model you have then expand the little plus next to "Electrical System." Look at the "Panel" and "Wiring Harness" diagrams for an idea of where parts are located. Unfortunately, Kubota doesn't describe the relays in any detail, so one needs to either have a schematic or follow the wiring to figure out what does what.
May the force be with you,
Steve
A little more info. Looking at the parts diagram, on the left side of the tractor under the starter you should find a connector that looks to just be a little loop. That wire is a fusible link. You need to check it with your multimeter to see if it has continuity.
Also, it appears the only neutral safety switch on your tractor is actuated by the clutch. I'm not seeing one for the seat or pto. However, I do see what Kubota calls a "combination switch" up near the dash but not sure what it does. Hence, if your pto is electrically actuated, then play with that switch.
Finally, there are two 15 amp fuses in the circuit. They look to be up under the dash area. Check to see if they're good.
You can go to www.kubota.com, click on "Parts" then "Illustrated Parts List." Accept the terms and enter your tractor model. PIck which model you have then expand the little plus next to "Electrical System." Look at the "Panel" and "Wiring Harness" diagrams for an idea of where parts are located. Unfortunately, Kubota doesn't describe the relays in any detail, so one needs to either have a schematic or follow the wiring to figure out what does what.
May the force be with you,
Steve
Last edited:
PitViper
Member
Equipment
B1750HSD, TG1860, 5’ box, 6’ grader, 6’ rake, pond scoop, PHD, boom pole, winch
The thread and last post is 6 years old.......
I too have missed these old ones when they suddenly pop up.
Dave