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The seat occupied switch energizes the operator presence relay. This relay allows power to the PTO clutch from the PTO switch only when energized (operator in seat).
A simple test
1.PTO switch OFF 2.Ignition switch to ON position. 3.Engine not runnjng 4.Operator in seat
Pull PTO switch. You should hear the the clutch engage with a notable pop. Then turn off PTO and it will make another pop or clunk when it disengages.
Similarly with PTO engaged, if you rise from the seat it should disengage.
Also a failed charging system may allow the engine to start and run but not provide enough current to properly engage the electric PTO clutch. With engine running check battery voltage is greater than 13VDC.
If you've checked all fuses and your seat safety switch and those are all good and working order what you probably have is either a switch failure or electric clutch failure. the electric clutch has a pigtail coming off of it, unplug that pigtail and check for voltage coming from the tractor to that PTO clutch. what you will do is set your brake, turn the ignition on but do not start the mower and check for voltage when you pull the PTO switch... if you have voltage there then it's definitely a PTO clutch those particular mowers have an electric clutch system
Craftsman Garden Tractor 917.28746 Engine shuts off when engaging mower deck. 917.28746 ... Then start the tractor and pull the pto button out. If the engine ...
iFixitI have an older Murray riding lawn mower, whenever I engage the mower the engine dies, otherwise it runs .... My dr feild brush mower ... cuts off when I engage theblades. ... My Huskee only shut off once I put it in drive with the blade engage.
First, is your PTO Manual (You Throw a Large Lever) or Electric (you push a button or pull a knob) If it is manual, check the cable that it is in position and not broken or stretched. If it is electric this is not as easy. First check for a fuse and relay. The power for the PTO switch is feed through the ignition switch so check connections at the ignition and pto switch. There are safety switches involved, mainly for reverse. This is usually a plunger switch and may be stuck. Most tractors have an override button or position on the ignition switch so try with these engaged. If it works the safety swich is your problem. Beyond these simple checks now you are traveling into the realm of electrical diagnostics. Check all connections between the PTO switch, and the ignition and the PTO clutch. Still nothing, you may have a bad clutch. These are expensive and you should have a tech check it before you run out and buy.
They are normally electro magnetic clutches, the click is the cluch engaging so i would guess it is working, arev you sure the belt is not broken or lose?
It's possible the repair folks didn't properly reinstall the mower deck belt. Check that it's in place, and under good tension. If that's OK, look at the wires to the mower engagement switch (PTO switch) and make sure the connections are on tight. Then check the motor pulley where the PTO clutch is, making sure those wires still in place.
The belt may have broken or is jammed, you'll have to look underneath the mower, have somebody move the PTO lever back and forth and you watch to see what if happening
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