Pto will not engage, clutch ok, replace pto switch, belt on correctly, fuse good,hat else can I check

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

Check all of your spindles to make sure no bearings are seized..also check all idler pulley bearings....good luck

Check your fuses
check the PTO switch
insure all of your safety switches on the mower are working correctly.
You can use a voltmeter to check all of these switches
if all of this checks out you need to replace the PTO clutch.

I’m happy to assist further over the phone at https://www.6ya.com/expert/christopher_722ea729aae6fd07

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.

This would be either the clutch relay, pto switch or pto clutch, check the relay first, then the pto switch, and lastly, check the clutch, if the clutch tries to engage with switch, then the switch and relay are good, and the clutch will need adjusted or replaced

electric pto clutches go bad, turn your ignition switch to the on position and turn your your pto switch on and see if you hear a click if you do that is the pto working if not check and see if you have a fuse for the pto i have seen switches go bad and it could be the pto clutch it self

check the wires they rub on sharp edges

Depending on your engine.. Briggs and Stratton or Kohler there are 2 different seat switches that are used to power the PTO clutch. The seat switch can cause the PTO clutch to disengage anytime there is not at least 70 lbs in the seat.

The PTO drive wiring has a 30 amp fuse in it. If by chance a stick went through the belt and tore off the wires at the PTO clutch (Common failure) even after you repair the broken wire you still need to replace the fuse.

Check the PTO clearance gap. It should be 0.012 dis-engaged. Any other value and the clutch will not work correctly. Adjust the clutch if necessary.

There is a 2 pin Pigtail just off of the PTO Clutch that you need to check for voltage at the connector. Probe the back of the wires if you can and your looking for 12V DC under the following conditions.

BRAKE ON or tied down
KEY ON
SEAT (Briggs and Stratton engine only) Someone needs to be sitting on the seat.

Then Pull the PTO Switch out. You should hear the PTO Clutch CLICK. If you hear the click there is no need to check voltage. The PTO switch is a multi function switch and it is quite possible the PTO switch failed. I doubt that the PTO Clutch has failed as they normally give you some kind of noisy indication that they are failing and don't fail straight away.

So.. In short
Check PTO Switch (Red wires) to usually red or brown thru the switch
Check 30 amp fuse
Check PTO clutch wires near PTO clutch (They get torn from something traveling through the pulley)
Check PTO clutch clearance at 0.012
Check Brake switch for an audible click as you depress it some distance No click.. possible bad switch
Listen for Seat switch Click as you slowly add weight to the seat. No Click or any click and it can still be suspect due to the Briggs and Stratton installed engine ones have more than one function.. Ignition and PTO clutch power.

The actual wiring diagram is on page 35 of the owners manal that can be found here:
http://www.managemylife.com/mmh/owner_manuals/27245/CRAFTSMAN-Lawn,-Tractor-L9910386?brand_name_search=917273023

Lastly... check each of the mower deck blade bearings. A seized bearing can cause PTO problems.

Hopefully you have enough information to solve the mystery. If not just respond here and I will help you.

Thanks for choosing FixYa.

Kelly

Most likely there is an internal short in the PTO clutch, but it could also be in the wiring, which is way cheaper to fix! So, with the engine off, get down on the ground, find the PTO clutch (it's between the two pulleys under the motor) and trace the wires that go to it. Look for a worn spot in the insulation anywhere, especially likely where the wires pass through the chassis or if they've touched a belt or other moving part. If you find a wiring problem, just splice in a new wire.
Ok, if you found nothing, then unplug the connector that connects the wires from the PTO. Start the engine, drive around, engage the PTO switch (of course, the blades won't spin). If the PTO fuse does not blow, you've proven the problem is in the PTO clutch and you must replace it ($150 or so, sorry!). If the fuse does blow, that's good news, you just have a short in the wiring or in the PTO switch itself. Disconnect the wires from the switch to differentiate those two possibilities. The PTO switch isn't too expensive either. Good luck! Please rate my solution if helpful.

check tension on belts