You've checked the wiring to the PTO and it looks OK. Does the PTO engage when the switch is thrown? Do you have a multi meter , so you can trace the voltage to the switch, from the switch to the PTO. You also should check the safety switch (s) which will prevent the PTO from engaging if there is a faulty switch. And it could simply be a fuse that has blown.
SOURCE: LTX1000 42" 18HP Kohler - Blowing fuse after 2-4 min mowing.
i hav a 18hp ohv eng. back fires and gas is coming out of muffler.
SOURCE: Mower pto engages when initially started but after
the coil in the electric PTO shorts out when it expands by heat causing it to lose it's magnetic pull and disengages- I hate to say it,but you need a new PTO clutch.
SOURCE: I have a Craftsman GT 5000 Garden Tractor, 25 HP,
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
Testimonial: "Kelly - Your troubleshooting info helped me determine the PTO switch, mower belt and 30 Amp fuse were good. Solution: New battery fixed it. Thx! - Tom"
SOURCE: I have a John Deere 102 riding mower with a manual
Check the belt its not tight, its loose or not fitted right.------
May be you put the belt loose or not properly.------
I agree belt is new, the belt is not the problem but its placement is problem.its coming out of its pulleys.Recheck that belt is intact and in-place and not getting loose.--------
Also recheck the connection of pto switch and seat switch.Remove the switch one by one and by pass it with a jumper wire and see if the blades getting engaged.-------
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Also check the bolt that holds the idler arm to the deck ,that bolt gets worn out causing the the arm to move up and down.
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This will help.Thanks.Helpmech.
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