Posted by Eric in IL on February 07, 2013 at 15:46:07 from (208.124.79.157):
I lost the P.T.O. brake function on my Massey 4355 last summer. Just now getting around to fixing it. The design seems inadequate to me as the tractor only has 600 something hours on it. We purchased it new and it has not been abused. Or at least I don't think it has.
The first pic is of the failed brake. Mind you this is a steel to cast iron friction application. No brake lining involved.
Seems like a mighty small friction area to stop the P.T.O. on an 85 horse tractor to me. Next picture shows where the brake lives.
I didn't have to go too deep as it is just behind the round plate. Not too bad of job as only the rear tire and fuel tank had to be removed for access. Getting to work under the radiant heater was nice too.
Last two pics are for the tractor supporting method police.
I think the brake looks to small, especially when I think of my 7' brush mower coasting to a stop. That is alot of inertia. The remedy according to the dealer is shut tractor off, let things coast to a stop, turn off pto, restart tractor. This is supposed to bypass the braking effect because it requires hydraulic pressure to activate the brake.
What do you think guys, did the engineer blow it or not ?
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