Can you give me the model and serial, please? But to start I'll post some general troubleshooting tips. Please look them over, then we discuss in greater detail if this doesn't pinpoint the problem...
First, check your battery. The PTO takes a great deal of current to operate. Consider that you are energizing an electromagnet that has to stay joined with a metal plate while the horsepower of your engine and the load created by the cutting deck are trying to pull them back apart. If your battery isn't fully charged, or is failing under load, the PTO goes cannot work. a fully charged battery will put out about 12.7v. By the time it drops to about 12.1v it's 50% discharged.Also, check to make sure the battery is rated at least 350 Cold Cranking Amps. If you have possibly replaced your battery, this could be the cause. Also, we find a higher incidence of initially defective batteries sold though discount retailers than though servicing dealers. If the battery keeps doesn't maintain its charge, you may have a charging system problem. A word or caution, never jump-start a lawnmower with a running car. The higher-powered charging system of the car will likely blow out ad ruin your mower's charging system. The charging system shroud be checked against manufacturer specifications to make sure it's performing properly.Your PTO switch could be failing. Some switches will "open" when they get hot. Check for loose wires where they attach to the PTO clutch. If they wiggle loose, current cannot flow.There's always the possibility the PTO clutch itself could be going bad. Some are adjustable, and this can make a difference, saving the cost of replacement. If you find slots and adjusting nuts, you can go in and check the gap between the two halves with a .010" feeler gauge. Make sure it's adjusted equally all the way around.
Can you give me a bit? I need to locate a schematic on this model and I also have to run an unexpected errand.
If you prefer to continue right now, feel free to opt me out and continue with another expert. We've got a dozen guys on here right now.
Thank you either way...
OK. Here's a schematic that we'll work from. What was the gap on the clutch when you checked it? What voltage was the charging system putting out?
Also, please do a voltage reading on the battery when you try to engage the clutch and let me know what the reading is. We're looking for how many volts the battery drops under load.