Tractor will not start, replaced and tested new battery (OK), engaged and disengaged PTO...engine turned over and ran...mowed lawn, stopped, will not start again. Playing with PTO switch results in either dead silence or some cranking noise..no start. Connections look good. Can this switch go bad or should I also be looking at brake/clutch and any other safety switches?
You didn't state the model or brand of tractor, but usually the way the cranking circuit work is, from the "S" terminal of the ignition switch, the circuit runs to the PTO switch, if it's in the OFF position, the circuit then runs to the pedal switch, if it's in the DOWN (or brake on) position it then runs to the solenoid. On other tractors, from the ignition switch, the circuit runs to the pedal switch first. (The seat switch isn't used in the cranking circuit).
Any switch can go bad, but I would more likely suspect the pedal switch or loose connection at either switch. (But it could actually be the PTO switch).
Try tracing the circuit from the "S" terminal of the ignition switch through the PTO or pedal switches to the starter solenoid. You may get lucky and find something obvious.
If you find nothing, try jumping across the pedal or the PTO switch (only two terminals are used in the cranking circuit, trace back to ignition switch for the incoming, outgoing is usually directly adjacent). Jumpering will take these out of the circuit and tell you if either is bad internally.
Lastly, there's always the possibility that the ignition switch is bad. (Doesn't happen all that often, but it's suspect as well). Jumper from "B" terminal to "S" terminal will take it out of the circuit.
SOURCE: lawn tractor engine dies when pto unit is engaged
Check safety switches especially the seat switch.
SOURCE: Sears lawn tractor. While mowing, ran over a
the branch probably got cought in the belt that runs the rearend it may have caused it to come off check the drive belt
SOURCE: Husqvarna yth2448 pto switch kills motor/battery will not charge
you may hav a bad alt. problem with the mower dying when you engage the pto is most likley a bad sensor or wire unplugged on the seat sensor.the way it works is if the blades are turning and it dosent sense you being on the seat the mower shuts down.this has been standard on mowers for quite a few years now. it keeps the blades from cutting you up if you fall off the seat while mowing. as for charging i would try cleaning the battery connections and get the battery checked first.
SOURCE: engine cutting off after engaging the pto (mower deck) JD 317
its likely to be a switch playing you up try hard wireing the switch to see if it stops this cutting out first, do one switch at a time till you fine the one playing up
SOURCE: My craftsman 944.609961 16HP lawn mower won't
my tractor cuts out and i have to jump it to start . i have replaced the battery and selenoid. help?
355 views
Usually answered in minutes!
Dennis, Thank you for your response. Since then I have located a wiring diagram for my Honda HT3813 (old lawn tractor!) which should help me follow your suggestions. As soon as it stops storming I'll send an update.
×