Husqvarna pto engage shut off engine

zilo · Jan 29, 2018

I have a Husqvarna yth24v48ls tractor, starts, runs forward, reverse normal, but whenever engaged with pto switch, engine would shut off in a second, I check the seat safety switch, pto switch and the ignition switch all in good condition. I tried the ignition switch on the reverse position;take out the bridge in the seat switch wire plug;disconnect the reverse switch;unplug the clutch/brake switch. And each time it still kill the engine when pto engaged, I notice the blades is turning the moment when the pto switch turned on. Can any one point a direction to the root of the cause.
Thanks

cjunrau · Jan 30, 2018

takes to much power from the battery and doesn't have enough juice left for ignition??? try a different switch to the electric clutch. maybe engage clutch with jumper from other battery source. Could also be clutch is shorting out causing it to die. I would start by unplugging clutch and then turn switch on, if it dies your switch is shorting out. if it doesn't then run 2 wires to clutch strait from battery and see if that works,

Bret4207 · Jan 30, 2018

You either have a short someplace, a bad electric PTO clutch or low battery voltage. Are you sure the mower spindles and pulleys are freely moving and not seized?

Steve@Advance · Jan 30, 2018

It is one of 2 things:

There is a mechanical binding that is killing the engine. Try unplugging the PTO clutch, see if it will run.

Or there is something in the safety circuitry that us shutting it down. I would look closely at the safety circuitry, get a wiring diagram, study it closely. Some have redundant circuitry that guard against intentional or accidental bypassing or disconnecting safety switches.

Craig2 · Jan 30, 2018

I had this happen on a John Deere 240. I knew the battery was old and getting a weak so I put in a new battery and that solved the problem. Battery just didn't have enough voltage to engage the pto and keep it running at the same time.

RayP(MI) · Jan 30, 2018

Had the same problem with a Woods zero turn commercial mower with a Kubota diesel engine. New battery fixed the problem. Apparently clutch engaging would drop system voltage to the point that alternator would stall engine.

zilo · Jan 30, 2018

Yes, the belt has good tension, and I can hand pull with all the blades turning.

zilo · Jan 31, 2018

I used a jump cable to connect the buttery terminal with a new and larger buttery, started the engine and minute later pull up the PTO switch, and it did the same thing, shut down the engine right away.

Bret4207 · Jan 31, 2018

(quoted from post at 06:47:59 01/31/18) I used a jump cable to connect the buttery terminal with a new and larger buttery, started the engine and minute later pull up the PTO switch, and it did the same thing, shut down the engine right away.

Unhook the belts from the clutch and try it. If it kills the engine then you either have a short in wiring/switch or the clutch itself is bad.

zilo · Feb 1, 2018

I unplug the electric clutch, and start the engine then pull up the PTO switch on engage position, and the engine kept running. and I measured the clutch resistance and it show exact 3.1 ohm. Don't know what to take about this.

zilo · Feb 1, 2018

I unplug the PTO, and then tried start Engine, but it won't start.

Bret4207 · Feb 2, 2018

I imagine the PTO switch has to be connected to start the engine as part of the safety interlock sysytem. I don't know what your PTO clutch resistance should read. I'd check my wiring very carefully for a short, exposed wire, etc. I had a brand new lawn tractor (AYP) that had pinched wires right from the factory and a bad PTO switch too. I don't know how you'd check the clutch itself and they're expensive to buy and replace if you don't know for sure they're bad. Does the belt sheave on the clutch turn freely by hand with the tractor shut off? It should. If it doesn't, that is an indicator of a problem.

If you unplug the clutch and pull the switch and the tractor runs, that sort of leads me to suspect a bad clutch, but it may be the circuit not being complete has an effect. You might try adding a jumper across the tractor side of that plug and see if that makes a difference. If it stays running, I'd bet the clutch is bad/seized/shorted.

zilo · Feb 4, 2018

I unhooked the belt from the clutch, and started engine, then pulled up the PTO switch, Heard the clutch clicked, and the engine kept running.

Bret4207 · Feb 5, 2018

I dunno, sounds to me like the load on the clutch is too much for it and it causes the engine to die. Looks like a bad clutch to me. A short in the wiring would likely shut it down with the belts off. Hard to say anything with 100% confidence. You might take the clutch off and see if you can power it up and see what kind of amperage it's drawing. You might be able to find the amp specs in a replacement clutch description. Apply a little load to the clutch and see if the amperage draw jumps way up.

Husqvarna pto engage shut off engine

zilo

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