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Manage My Life

Craftsman Riding mower problems with pto engaging and handle bars killing motor...

by Manage My Life Last activity date:
July 20th, 2012

I am helping my grandfather fix his craftsman zero turn mower model # 107.277740.. I think I am having multiple issues.. First he had to jump start it.. he says it is a brand new battery, but it could need charging.. we get it cranked and engage the blades and I am off and mowing.. It mows 10 feet and the blades disengage automatically, furthermore the switch will not re-engage the blades.. at this point I kill the motor and check wiring for shorts or any obvious problems.. none to be found. The only thing I noticed was that while the ignition was turned on and the motor not running the switch did in fact cause a popping sound from the rear of the tractor as if it was trying to engage while not running. I jumped it again and got it started.. blades engaged.. I mowed about 10-15 feet and same thing happened.. blades just stopped working while motor running and switch pulled out. this time I tried moving wire while engine was running.. It did no good.. I did notice something really weird.. if you lay the right handle down while the left is up it kills the motor but if you lay both down or leave the right up and lay the left down it does not kill the motor.. Finally I jumped one last time and this time mowed about 130 feet and it ran great then all of a sudden started to disengage and re-engage the blades rapidly maybe 4 or 5 times .. so I parked it and have no clue where to start trouble shooting.. I am at my wits end.. please help...

Tags:
Craftsman , Lawn Mowers
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Answers (4)
Manage My Life
Well, with the way it's not starting, the charging system will not really have anything to do with that. The charging system will only come into play once the engine is running.





I think something else may be going on. Remove the spark plugs and then see if the engine will spin over when you try to start. Obviously, with the spark plugs removed the engine is not going to start but I want to see if the engine will spin as this will help me know what direction to send you in.





If the engine spins over with the spark plugs removed then the problem may be the valves. There is a compression relief mechanism built into the valve system. If the valves are not adjusted correctly then the compression in the engine will be greater than what the starter and battery can spin past. Check the link below if the engine spins with the plugs out and do that procedure on your engine and let me know what you find.
by Manage My Life
July 20th, 2012
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Manage My Life
Just talked to my grandfather and he said that he bought has tried two batteries with this problem. The battery that is on it now is brand new. I will put a trickle charge on it tomorrow and test the voltage. When you try to crank it, it doesn't even try to turn and when you jump it it takes a min or so to build up the juice with the van idled up to get it to start turning. so I am pretty sure that the charging system is the case. I did not know that the clutch was powered by the battery, so , now it's starting to make sense. So what do I check or need to look at if the charging system is the culprit. I believe that's gonna end up being the next step.. and thanks so much for helping out... (glad i didn't go straight for looking into the possibility of a clutch adjustment.) I will let you know for sure what the read on the battery is for sure tomorrow.. Thanks!!
by Manage My Life
July 20th, 2012
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Manage My Life
Okay. The situation with the handles is normal; it's the result of the safety circuit.





The situation with the engine starting: When you try to start the engine (normally), what happens? Does the engine try to start (try to spin) or does it do nothing at all?





If the battery is not fully charged then the blades will shut off after a few minutes as the PTO clutch is powered by the battery and charging system on the engine. I suspect a possible problem with the charging system but it could simply be that the battery is weak and the engine is not running long enough to charge. Stop by an auto parts store and pick up a cheap volt meter to check the DC voltage of the battery as it sits and when the engine is running. When the engine is running there should be around 13 volts DC or better at full throttle. If it's possible, check the battery voltage as you engage the blades. If the voltage drops below about 12.7volts DC then we know the charging system is failing when a load (the PTO) is put on it.





Let me know what you find with this and what happens when you try to start and we can proceed from there.





Thank you for using Manage My Life!
by Manage My Life
July 20th, 2012
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Manage My Life
It sounds like you are having a hard time getting the lawn mowed with the Craftsman lawn mower that just won't stay running. I found some links that may be of some help with the problems you are having with your tractor.
Answered in 8 minutes
by Manage My Life
July 18th, 2012
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