B7800 won’t start

[Gto19]

Hey guys
I have a 150 hour b7800 tractor that is a garage queen . I mainly use it to mow my field. I turned it off and now it won’t crank . Lights all come on though . I checked all the safety switches except the clutch safety switch because I don’t know how to get to it . I see the white connector though . I can easily start the tractor with a long jumper wire I made to go to the positive side of the battery to the starter .It will turn off with the key . Any help before I call a mechanic?


I’ve also tried rocking the forward reverse pedal to its sweet spot with no luck

 

[CH4Ohio]

Track down that clutch safety switch before you call a mechanic. Follow the linkages.

 

[Gto19]

Track down that clutch safety switch before you call a mechanic. Follow the linkages.

Yes I can see the clutch safety switch. It’s a plunger style like the other three

 

[ronjhall]

Are the PTO levers in off position? That’s the first thing I check when I have no engine turnover when key is turned to start position.

 

[CH4Ohio]

Ok. You said you didn’t check it. Sounds like you have now??

Mine had to be adjusted because it had backed out a little. Pretty easy fix if that’s the problem.

 

[Gto19]

Are the PTO levers in off position? That’s the first thing I check when I have no engine turnover when key is turned to start position.

Yes
Always the first thing i check

 

[Gto19]

Ok. You said you didn’t check it. Sounds like you have now??

Mine had to be adjusted because it had backed out a little. Pretty easy fix if that’s the problem.

I haven’t checked the switch with my volt meter because the plug is buried but I can see the plunger part of the switch and it’s making contact with the clutch bar when I engage it

Thanks guys

 

[number two]

Wow!
An 150 hour B7800 is a garage queen indeed!
Good Luck with your diagnosis!
Could it have the OPC(Operator Presence Controller)system?
Just a thought,

 

[CH4Ohio]

I haven’t checked the switch with my volt meter because the plug is buried but I can see the plunger part of the switch and it’s making contact with the clutch bar when I engage it

Thanks guys

Did you try pushing up on the plunger with a flat screwdriver, etc. to be sure it's being actuated far enough to close the switch? Mine wasn't and I simply had to loosen the adjusting nuts and move the switch a little closer to the linkage. It was getting "pressed", but not enough to close the switch.

Worth verifying . . .