Kubota L3700 su dies after puhing foward pedal or engaging pto any ideas
- Thread starter crhilton
- Start date
- Views: 3460
k0ua
Epic Contributor
Because the "logic" of the tractor is testing for two separate conditions. The three wires to a switch indicate the switch is a single pole double throw switch. So you have a Common terminal (wire 1), a Normally Open terminal (wire 2) and a Normally Closed terminal (wire 3). When the seat is in its static resting condition with no one in the seat neither the NO or the NC sections of the switch are "made".
When a person sits on the seat the NO section of the switch "makes" connection to the Common connection. This is how the tractor logic "knows" the operator is sitting on the seat.
When the operator gets up from the seat during PTO operation, the engine starts to die, but if the operator will pull up the seat rapidly after he gets up, the NC section of the switch will now "make" with the Common terminal, and this is how the tractor "logic" now "knows" that the operator is getting off of the tractor, but wants to consciously continue PTO operation while he is on the ground. Such as to operate a chipper.
Otherwise if the operator does not pull the seat up and make that NC and C connection on the switch, the tractor logic thinks that the operator has fallen from the tractor and is now about to get ground up by his PTO driven implement, therefore it shuts down the engine electrically, by shutting off the fuel from spring pressure of the fuel solenoid. The end result is your careless azz is perhaps saved from destruction.
Now if this careless operator who has pulled the seat up so that he may continue ground PTO operations, and he falls in said chipper, well, too bad so sad, the tractor will happily grind him into mush. :laughing: There is a limit to these tractor "logic", safety switch protections.
As for the 5750, they figure if you have money enough to buy one of these, you probably have brains enough not to be careless.:laughing: I really don't know why.. My Kioti is about like a Grand L, and it doesn't have a seat switch at all. If you want to get off while running the PTO, have at it. If you want to stand up and look at the fork tips entering a pallet, while pressing the Hydo "go" pedal, have at it. the only "safety" it has is it must be started in neutral. Other than that, you are on your own. As it should be.
LD1
Epic Contributor
The extra wire is because it's not a simple two position switch. It's a 3 position switch.
It detects 1. if someone is on the seat 2. If no one is on the seat but the seat is down, and 3. If the seat is up.
Under normal circumstances, if you engage the PTO and are not on the seat, or get off the seat, the tractor shuts off.
But then how are you supposed to run a PTO generator, PTO wood splitter, PHD, PTO wood chipper, etc.
Thus the 3 way seat switch comes into play. Engage PTO, and within a second or two of getting off the seat, flip the seat up and the tractor will stay running, with the PTO ON, and no one on the seat
k0ua
Epic Contributor
LD1
Epic Contributor
You description, while accurate is no where near as "colorful" as mine... see above.
Must have been typing as I was.
Don't like getting tool long winded on a reply when I'm at work and on my phone
To all that have sent me very good advise. You have to be able to laugh at yourself every now and then. The seat switch was the culprit, not because it was bad. It was not connected completely. It is now! And zip tied to frame as it was originally.
LD1
Epic Contributor
Glad it was simple and your back in business
k0ua
Epic Contributor
:thumbsup: and thanks for reporting back.