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Gravely 8123 lawntractor

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Hey everybody. I have a Gravely 8123 tractor. Just yesterday I was cutting grass and tried to disengage the blades and the PTO lever moved but did not disengage the blade. Now the PTO lever moves freely back and forth with no tension and does not disengage the blades. Does anyone have any but idea what has broken in the PTO case. Is it the spring, a key on the shaft? I have studied the diagrams but I am not sure what the problem may be. Is anyone familiar with this issue. Thanks in advance!
 
I have a 8102 which is a 10 hp. I bought it with a broken rod, and it had set for a while. After I rebuilt the engine and got it running, and then engaged the pto, it wouldn't shut off. I talked to a
dealer, and he said because of sitting a while, that sometimes happens, as I recall he mentioned something about a cone or something that causes the problem, but it has been a few years. What he advised was
to put a screwdriver or punch through the u joint, and to bump the starter with the plug wire off, or better yet turn the engine by hand if possible. He did advise me to BE CAREFUL because if it was stuck
hard enough, bad things could happen. I was able to free mine up that way. He also said if that didn't work, it would have to be torn apart. Sometimes in the spring the mower deck doesn't want to
immediately shut off the first time I engage it. After using it and engaging and disengaging it a couple times it works fine. I don't actually recall if when it happens the lever moves easy or not. Did your
mower set for a while? If not, and you use it regularly, yours might have a different issue than mine. Good luck.
 


Thanks for your reply. I have used the tractor about every week this summer cutting grass. The PTO lever has no tension at all it is like the internal spring has broken or something . The PTO lever is connected to the lever on the PTO housing. I am convinced I do have an internal problem. Thanks for your input!
 
I'd guess the spring.....I've been running my
8183-T since 1980, never had it apart so can't
give you anything definate.
a201318.jpg
 
If you are lucky.....the PTO has a 1/4 dia. pin in it. Take your mower off and take a look at things in there. It is dirt simple. As you rotate the leaver you will see that the "dog" should move in and out about 3/8 of an inch. If not take out the two bolts and see what is broken. What happens is people take out that engage lever and they drop the little block into the front casting. You most likely will find it laying in the gunk in the bottom in front of your nose. There should be one!!! Because if there is not one the 1/4 hardened pin gets ground off and now you need to replace that. I used a 1/4 drill bit to make a new one then put everything back together with that little block that rides in the groove around the engagemnet dog. While you are at it, check the teeth on the dog. They should be nice and square with no rounded edges where they engage. Also take a look at the clutch on your mower. The Ramps should be in the shape of little triangles with a nice sharp end and not all ground down. Have done several machines. Have fun.
 
never mind the pin or the two bolts. jeffcat is either taking about a 400 series or two wheel tractor what you have is an 8000 series totally different machine. if you look at the parts diagram ray posted you will see a snap ring on the engine side of the pto shaft if that breaks it will cause thie problem you describe. I worked on a lot of those old eight speed graveleys.
 
did this just happen or has it been this way since you have had the machine? Another poster mentioned stuck pto clutch and that can happen but the screwdriver threw the yoke trick only works if it slighty stuck most of the time it requires removal of the clutch.
 
k

I have had this machine for 30 years. The PTO leaver can be moved now back and forth with one's little finger whereas before it took a strong grip to engage and disengage the PTO.
 

That is what I was hoping for. I will check it again when I get home. Before this happened it was like the PTO lever had to pass over a center hump (for lack of a better way to describe it) to engage or disengage the lever to lock it into position. When I checked the linkage it looked fine. Thanks for the suggestion.
 
Opps sorry I just always think of a walk behind machine. Never even had the chance to play with a rider model. Well heart was in the right place.
 
(quoted from post at 14:53:57 09/20/15) Hey everybody. I have a Gravely 8123 tractor. Just yesterday I was cutting grass and tried to disengage the blades and the PTO lever moved but did not disengage the blade. Now the PTO lever moves freely back and forth with no tension and does not disengage the blades. Does anyone have any but idea what has broken in the PTO case. Is it the spring, a key on the shaft? I have studied the diagrams but I am not sure what the problem may be. Is anyone familiar with this issue. Thanks in advance!
Click to expand...

I know this is an old thread but did you ever resolve this? My 8163T is doing the exact same thing and I'm hoping I don't have to split the transmission. The PTO lever lost tension while I was adjusting freeplay so it would most likely be an external issue related to that, but nothing looks out of place.
 
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