766 starter relay

rz1t0x · Dec 15, 2009

i"m helping repair a 766 in which the starter solenoid engages but the starter does not turn. the solenoid always works but the starter began to stop turning. when the starter button is engaged, the solenoid clicks in but no sound from the starter (it started to sporadically stop turning 3 weeks ago and now doesnt spin at all) my guess is there is a relay somewhere that has failed. can someone tell me where to find the relay? Does anyone have a diagnosis?

El Toro · Dec 15, 2009

Have you loosen the starter bolts to make sure the bendix drive isn't stuck? You need to clean all the battery connections at the batteries and at the solenoid & the starter. Your solenoid may be the problem if no voltage is being fed to the starter. Use a volt meter and see if the starter is getting battery voltage when someone makes an attempt to start the engine. Keep your hands and fingers away from the starter drive & flywheel. Hal

IaGary · Dec 15, 2009

Why would you not think the solenoid has gone out completly now?

If you have voltage from the solenoid to the starter then it could be the starter.

If the solenoid is not putting out voltage to the starter, it is the solenoid or the switch.

If you have no voltage on the small excite post of the solenoid when the switch is engaged then you have a switch problem.

Gary

Brownie 450 · Dec 15, 2009

While the solenoid is energized, try shorting across the 2 large terminals [1 from the battery, & 1 to the starter] with a suitable tool. If the starter turns the engine, the contact at the back of the solenoid is probably bad, or one or both of the lugs aren't making good contact with the solenoid terminals[ happened on our 1066].
Of course, observe the usual safety procedures--tractor in neutral--wheels blocked--don't wear a tie--& so on. When shorting, try to short using the nuts--not the threads on the solenoid.

rz1t0x · Dec 15, 2009

thanks for the particulars on the starter. i'll check it out. i just had the same issue on an AC tractor where it had intermittent operation from worn and corroded contacts.

Owen Aaland · Dec 15, 2009

The starter/solenoid can be checked with a test light. Engage the solenoid. Use the test light on the terminal that goes into the started. If the test light lights up the problem is in the starter, most likely worn brushes. If the light shows no power with the solenoid engaged the problem is the solenoid contacts, usually the one where the battery cable attaches.

A bad connection in the solenoid can often be corrected by removing the battery cable and loosening the nut that holds the stud to the cap. Unscrew the nut enough to be able to push the stud in and turn it a half turn and them reassemble.

rz1t0x · Dec 23, 2009

Just a follow up. The contact ring in the solenoid was chewed up and corroded. I replaced it and everything works well now. Thanks to all of you who commented. This forum has been very helpful. Hats off to all you "experts". Keep up the fine work.

766 starter relay

rz1t0x

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El Toro

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IaGary

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Brownie 450

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rz1t0x

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Owen Aaland

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rz1t0x

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