Anybody A Zero Turn Mechanic
I am working on a Husqvarna PZ 5426 zero turn.This is about a $11,000 commercial machine that professional lawn care companies use.It is powered by a 26 HP Kawasaki.The guy who owns it took it to the local dealer and it was there for 6 weeks and they never started working on it.The owners ask if I would pick it up and put a starter on it, change the oil and sharpen the blades.I charged the battery, started it up and cut my back yard.When I pulled it in the shop,it would not cut off with the key.After much checking with the multimeter I determined one of the coils was bad.I replaced both coils and it started up and turn off with the key like it should.It runs fine but when you take off the hand brake,move the control levers or engage the blades the safeties are killing the engine. I by passed the lever and hand brake safety and it will start and move just fine but when the blades are engaged it still kills the engine.The seat safety checked out good so I am trying to figure out what to do next. If Perry Shooter was still with us he could probably tell what the problem was pretty quick.Any suggestions
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Can't you remove all those safety switches and be done with it ?? I had pretty much the same problems several years back and removing all of the safety systems cured my problem, just don't let morons operate the mower (*remove keys after use*) or run the risk of being sued. Also I agree, get a wiring schematic and be careful of what you cut, double and triple check before doing so.
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you unhook the engine kill wire in the connector. and if you have a fuel cutoff in your float bowel you will have to provide that with power. engine will run but will be hard to shut off.
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If this mower belonged to me I would have probably by passed the safeties,but it belongs to my daughter in laws grand dad. I had one a few years ago that I had to by pass the safeties and I had teenage sons here then.I told them to be careful and in the middle of the steering wheel I wrote with a permanent marker- NO SAFETIES-DFU- They knew what that meant.
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I have the exact same machine and had the same problem twice.
First time the switch for the parking brake lever was bad. Found it with a multimeter.
Second time wires under the battery area dropped down and rubbed on a pulley/belt. They were the wires for the safety switch circuit.
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It was a bad seat safety timer.Not the seat safety switch but a seat safety timer. It is an electronic device under the ignition switch and PTO switch.They must be like vehicle chips because no one I spoke with had one or knew when they would receive more. I guess I was lucky to find the last one at a small dealership for $106.
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i bet they use that so the motor doesnt try to shut off if you bounce on the seat, or just lift lift your weight of the seat for an instant. it keeps the motor running until it makes sure you really did egress the seat. if that is true that would be at the top of the list of totally useless features to have.
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Glad you found the problem
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Glad it's fixed too! Now I'm curious about the purpose of the timer switch! If @varian is right, who decided how long it takes to step off and put your foot under the deck? Seems that switch COULD be bypassed, but with no schematic(and not hands on) I couldn't tell.
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If the mower was running,you could unplug the timer an all the safeties would work.If you cut the mower off it would not start back until the timer was reconnected.
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buddyb: 30432292503579/comments/30432341595931
The old 2 stroke Detroit diesels had an emergency stop where a spring loaded plate would cut off the air supply.I never saw one do it but I heard stories of them uncontrollably running away and destroying the engine.
We had an Oliver tractor with 2 stroke Screaming Jimmy in it. It didn't run away often, but we always kept a coffee can that was almost the exact size to cover the air inlet. When it would happen, it would do it right at start up. So, we'd start it up with the can in hand just in case. It didn't rev fast, so one had time. It just didn't stop revving higher and higher. I so wish I had some pictures of that tractor in action. We used to cut silage with it at night and that exhaust manifold on up towards the turbo would be glowing red. The other tractors we had were kind of junk, old, worn out, and under powered (Ford 3000, International M and 400, 1850 Oliver, and this 1950 Oliver). This 2 stroke diesel could get some work done but it was loud. My dad still says it was that tractor that made him hard hearing. I don't doubt it.
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