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Re: ford 515 independent pto


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Posted by Sean in PA on April 17, 2013 at 12:23:20 from (71.224.102.32):

In Reply to: ford 515 independent pto posted by fordtractorpro on April 17, 2013 at 11:02:22:

The independent PTO is hydraulically controlled. When you move the handle to engage and disengage the PTO, it moves a hydraulic spool valve inside the rear end hosing. The PTO has a multi-disk clutch pack with a spring and a hydraulic piston, and when you engage the PTO lever the hydraulic piston gets pressurized and pushes against the pring to engage the clutch. When you disengage the lever, not only does the fluid pressure to the piston get diverted so that the spring can disengage the clutch, the control valve also sends pressure to a separate piston that acts as a brake against the side of the PTO shaft. It is not uncommon for the brake to be worn to the point where it does not fully stop the PTO.

The question is "How strong is the PTO turning when the lever is in the off position?" Do you have a brush hog or similar implement that provides a lot of resistance tot he PTO? If so, hook that up and see if it stops turning when you disengage it. If it is just the brake, youa brush hog should stop it, or at least slow it down severely.

If you don't have an implement to test with, you should be able to stop the PTO shaft by pressing against the side of the shaft using a 2x4 levered against a lift arm or some other fixed spot on the rear of the tractor. If the clutch is shot, a 2x4 won't stop it. Be careful when you try to stop it using the 2x4 as if the clutch is shot and it's still delivering full power to the PTO, it's got around 50hp behind it so if it kicks that 2x4 someone or something could get hurt.

In any case, you should be able to replace the clutch and/or PTO brake by removing the rear end/hydraulic top cover and pulling the PTO shaft out the rear of the tractor some, without having to split the tractor.


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