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Thread: Any one know about hydraulics?
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31st Dec 2014, 12:07 PM #1Diamond Member
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Any one know about hydraulics?
So we've got a "tipping carryall" to go behind a tractor - very handy for moving material around, but it uses a lever to release a catch at the back to tip the bucket, which is hard to use if the tractor has a cabin.
IMG_0696.jpg IMG_0702.jpg
So the idea is to fit a hydraulic cylinder to each side like so:
CarryallMod.jpg
That way it can be tipped from within the cabin using the remotes. Also, it should allow the bucket to be crowded back a bit more.
I think it will work OK, although I'm not sure if you need more than a t-piece splitting the line to each cylinder? I've noticed loaders often have a control block with extra relief valves, which I assume is to help balance the pressure between two cylinders. If one side is more heavily loaded than the other, I'm guessing the bucket will get twisted?
Any suggestions welcomed.
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31st Dec 2014, 01:31 PM #2Most Valued Member
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Hi Rusty, I know nothing about hydraulics, what I am suggesting is that you place this in the metalwork section, as there might be someone who doesn't come that knows these things.
Kryn
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31st Dec 2014, 02:25 PM #3Most Valued Member
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Only a "T" piece is required, the other valves that you have seen on loaders might have been load check valves for added safety. These require pressure to be applied before they release, so if a hose bursts the bucket or arms will not drop unexpectedly. These are usually plumbed in with hard lines for maximum safety.
My Husky skid steer uses only "T" pieces.
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31st Dec 2014, 02:26 PM #4Diamond Member
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Cheers Kryn - will do.
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31st Dec 2014, 05:19 PM #5Diamond Member
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31st Dec 2014, 11:19 PM #6future machinist
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A tee piece is the go shouldn't be a problem worked on my homemade tractors front loader
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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31st Dec 2014, 11:23 PM #7Most Valued Member
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Not 100% sure on exact legalities, but I know that workplace regs now require log loaders to have twin top clamps on circuits individually protected by load check valves and loaders that have either EWP's or Jibs attached require them on both the lift and crowd circuits. In your case, what's the worst that could happen if a line blows? You drop a load of dirt or rocks on the ground. No load check on the 3PL anyway.
Could you get away with just one central cylinder to keep costs down? Quite a few Bobcats had only one central crowd cylinder by the way. Yet another option with multiple benefits would be a hydraulic top link, this may even give the desired range of crowd without fitting extra cylinders to the implement. I have a hydraulic top link on my tractor and wouldn't part with it for the world.
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1st Jan 2015, 10:59 AM #8Diamond Member
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The bucket letting go isn't a big concern - it'll already do that now if you're on bumpy terrain with a heavy load - I think the latch is a bit worn.
My first thought (after I worked out hydraulically actuating the latch would be too hard) was a single cylinder, but it would need a very long stroke to tip the bucket enough to dump, and there's no room for such a big cylinder. That lead me to the idea of putting one each side (much closer to the pivot axis), where I'd only need an 8" stroke.
We already have a hydraulic top link, hence the dodgy-looking mod to the top of the implement, as the cylinder is a bit longer than ideal. It does help quite a lot, but there isn't enough stroke to be able to dump just using it.
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1st Jan 2015, 08:44 PM #9
It would be relatively easy to make a scissor action lever that allows for a shorter cylinder to actuate a longer stroke. Particularly considering that you don't need much force at all.
Civilized man is the only animal clever enough to manufacture its own food,
and the only animal stupid enough to eat it.
Barry Groves
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