770 wiring harness

rustyplow · Jun 8, 2019

Bought a new harness for the 770. All is good except the pink wire going to starter solenoid. Has a loop with a break in the middle with the ends having eyes crimped on. Instruction sheet says goes to safety switch. What safety switch would a 770 have that is in the area under the gas tank? did not find anything in the book. Old harness was the same, but had the wires cut short and twisted together and taped.

jh105 · Jun 8, 2019

Goes to the Clutch safety switch. Just follow clutch rod ( shown in pic 1) rearward and you should find a micro switch. It must have been bypassed on your tractor or you would have seen it when you removed the old harness. If your switch is missing or is inoperable just connect those two wires together. In my opinion the best option is to have a functioning switch.

rustyplow · Jun 8, 2019

Found it, whats left of it anyway. Couldn't see it but could feel it. Got the mirror out to have a look. Never knew it had such a thing. 1550 don't have one. But maybe it is should have. Thanks for the help.

J. Schwiebert · Jun 8, 2019

1550 does have one but is located in transmission.

rrlund · Jun 9, 2019

That's a neutral switch.

jh105 · Jun 9, 2019

Pretty sure 770 never had a neutral switch just a switch where you had to depress clutch pedal to start

rrlund · Jun 9, 2019

That was in response to JS in regards to the 1550. The 1550 didn't have a clutch safety switch,just a neutral switch.

Oliver 500 Wa · Jun 9, 2019

Every vehicle I have owned that had a clutch interlock, I have jumpered it out. I don't like the idea of applying the pressure of releasing the clutch against the crank thrust bearing when there is no oil pressure or flow.

I have no solid proof that this helps the life of the thrust bearing, but I'm sure it must.

oliver90owner · Jun 9, 2019

How long do you crank your engines before they fire up? How many crank revolutions? It might marginally affect an engine which has stood a
very long time, but I doubt it has the slightest effect on a regularly used engine.

jh105 · Jun 9, 2019

Ok sorry. I see now it says right there ?in reply to J S ?. It did seem odd that you could make that mistake with your knowledge of Olivers.

Oliver 500 Wa · Jun 10, 2019

How long do you crank your engines before they fire up? How many crank revolutions? It might marginally affect an engine which has stood a
very long time, but I doubt it has the slightest effect on a regularly used engine.

Tractor sometimes has to crank 10-20 seconds when cold out. It never had a clutch interlock, I just make sure it is in neutral and crank it up.

I have rebuilt 3 engines from manual transmission cars that had clutch switches for at least some portion of their life. All of them showed more wear on the flywheel side of the thrust bearing. Some of that is to be expected just from normal use. Some may be from cold starting with the clutch pressed. Again, no solid proof, but IMO it sure can't hurt to eliminate the clutch switch. Subjecting a plain bearing to high loading with no oil pressure is not good.

I get that it is installed to help folks that might forget to be sure the tranny is in neutral before starting. If my wife had a stick shift car, I'd probably leave the clutch switch in place. For my own use, it goes away.

770 wiring harness

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rrlund

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