743 b bobcat fuel shutoff valve

[bobcat743b]

I have a problem with my electric fuel shut off valve. if you turn the key on it wont move but if you manually move it it will stay open. when you turn the key off it closes fine. my question is it spring loaded so when power to t is lost the spring closes it. it would seem theres power going to it when I turn the switch on cause it stays open if I manually open it. so is there just one coil in there with a spring. anyone ever had these apart. thanks norm

 

[flyerdan]

Without going to the parts books and just generalizing here:
As a rule, those solenoids have a pull and a hold coil. The pull is activated when the key is in start, as to power it all the time would burn it up. The hold coil is weaker; as you've noted it will hold when helped into position. The arm in the fuel pump is spring loaded to default to closed.
First thing to test is that the wiring connectors are clean and tight, and that grounds are good. If that doesn't make a difference, break out the DMM and check for voltage, continuity and coil condition.

 

[bobcat743b]

Without going to the parts books and just generalizing here:
As a rule, those solenoids have a pull and a hold coil. The pull is activated when the key is in start, as to power it all the time would burn it up. The hold coil is weaker; as you've noted it will hold when helped into position. The arm in the fuel pump is spring loaded to default to closed.
First thing to test is that the wiring connectors are clean and tight, and that grounds are good. If that doesn't make a difference, break out the DMM and check for voltage, continuity and coil condition.

thanks

 

[Tazza]

thanks

Very good advise. You will have 3 wires, red, black, white. Black is ground, white or red is hold and pull, i never remember what is what.
As stated, the hold coil is a low power coil that can stay running without burning out, the pull can only be on a few seconds or it will burn out. They are genereally wired to a timer or to the starter, when the starter cranks, the pull coil is pulling in.