Gallery, Projects and General > Project Logs
Mounting a Tractor Hedge Flail
awemawson:
Like a complete twit, I had put the restraining chain on the wrong side, the pump had rotated, and torn the output hose -arrgh :bang: :bang:
Changed the chain to the other side, and called a travelling bloke who makes up hoses, as there is no way I'd use the Band-IT approach on pressure hoses.
Looking at the parts drawings the pump is actually illustrated 'swung up' rather than 'swung down' as I have it so presumably the restraint chain would have to go round the top link - I may relocate it when chappy comes to make up the hose
Pete W.:
Hi there, Andrew,
I'm sorry to read of your set-back. I hope the hose man comes without too much delay.
It isn't clear (to me) from your pictures - what keeps the hydraulic pump in the correct axial position on the PTO shaft?
Comparing the finish of your new spars with the yet to be done flail tank, I was reminded of Rust-Oleum paint. The story was that the original Rust-Oleum formula was developed by a fishing trawler captain who noticed that the trawler deck area where the catch was gutted never rusted. If that was true, maybe that original formula would have stood being applied over residual hydraulic oil?!?! Trouble is, the paint manufacturers all seem to have changed their formulae recently. My ML7 stands on a home-made swarf tray and cabinet finished in the original Valspar, I think it was described as 'three hour enamel'. It's still looking good after 44 years!
vtsteam:
I'm sure it works, Andrew, but that chain restraint seems mickey-mouse to me, and puts shock point stress on the cast pump aluminum gear housing and bending stress on the PTO shaft, since the pump is so far out with no support.
On the backhoe, which also has a PTO driven pump, it's bolted securely to the tractor frame. Now I realize the point was to make the pump more easily removable in this case, but a chain? There are plenty of ways to make solid, but removable attachments -- hitch pins for instance, seen on, well, practically all tractor implements. Or they could have mounted the pump solidly on the flail frame and used a universal PTO shaft.
Failing that, if they insisted on a chain, gosh why not two? One on each side. That would have prevented the damage from a mistake and restrained the pump in case one or the other chain had failed.
Apparently saving the cost of another foot of chain was worth more then the damage of connecting it to the "wrong" side". Or in the case of a broken chain or casting (a distinct possibility) the effect of a flailing hose and chain on a farm worker.
awemawson:
Pete and Steve, thanks for your kind words.
Pete, that tank is probably not going to be painted - it would require a major strip down that isn't going to happen (unless perhaps in extremis!) It could have a 'slap of paint' job, but they always look terrible close up. PTO shafts have a groove cut into them through the splines, and attachments have an arrangement that clips into the groove to stop them moving axially.
Steve, I agree the chain is micky mouse - but that's the original design, features in the parts diagram etc. I suppose it does let it float, and the pto is only doing 540 rpm. More modern flails do have a rigidly mounted hydraulic pump with a pto shaft
PekkaNF:
I feel pain of the misshap, hopefully gets fixed economically
--- Quote from: Pete W. on July 28, 2014, 08:26:58 AM ---It isn't clear (to me) from your pictures - what keeps the hydraulic pump in the correct axial position on the PTO shaft?
--- End quote ---
There is a groove on the PTO splined shaft. Also there is spring loaded detent (pin or balls) that you press in when you mate the splined shaft, the detent will pop up and lock into the groove and holds the pump in plase. Just like cardan shaft.
http://www.mytractorforum.com/attachment.php?s=39b06f80feec7f2314ef3410c95c82d2&attachmentid=271666&d=1366761349
http://www.mytractorforum.com/attachment.php?s=39b06f80feec7f2314ef3410c95c82d2&attachmentid=271602&d=1366760958
Pin is ofcourse more prone to something, although these should be protected. Some horrendous accident has happened when something has been jiggeled into PTO and if not seated victim has reached into PTO clutch to ease it a little.
Pekka
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