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Post by Rich Waugh on Oct 14, 2011 8:36:04 GMT -5
I was using the Jinma loader the other day and bent the bucket cylinder rods. Both of them, one really badly and the other not as bad but still bad. I had to use the press to straighten them and that screwed up the chrome on the rods, of course. They should be replaced, but I'm using them so far. I have absolutely NO idea why they bent that way - I wasn't doing anything but moving some loose dirt when my bucket curl started making a horrible noise and my brother noticed the rods were pretzled.
Problem is, replacements are $400 each - ouch! I'd like ot use after-market cylinders that could be had for less than half that, but there are none available in the same configuration. The OEM cylinders are 2" and about 34" long, but only have a 22" rod in them. So, here's the question:
Is there any reason I couldn't use a standard 2"x24" cylinder and relocate the top mounting points to part way down the arms? Such cylinders can be had for about $150 each and the relocation wouldn't take more than half a day. A couple of hose ends or adaptors and I'd be good to go.
What say those of you who know way more than I do?
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Post by mrmikey on Oct 14, 2011 15:07:42 GMT -5
I was bit confused until I went out and looked at mine, a Koyker 140. The reason the rods are so long (if it's the same configuration as mine) I think is to put the stress on the joint, not on the outer arm by moving the upper mount to the joint.
1) By moving the mounts closer out towards the bucket away from the joint, you're moving the stress closer to an unreinforced area of the outer loader arm. If you add some reinforcement to the arm I can't see it not working nor causing any damage, if done properly
2) Be sure the cylinder will fit between the mounts on the bucket.
I3) Make sure you get the same stroke, too much and you'll end up bending your cylinder, too short and it won't dump totally.
You weren't back dragging by any chance with the rods extended too far?..Mike
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Post by mrmikey on Oct 14, 2011 15:20:16 GMT -5
Just had a brainf**t, why couldn't you get cylinders with the correct stroke and modify them by adding extensions the the barrell end of the cylinder.
Since the oe cylinders are toast, cut off the mount on the barrell end of the good cylinder and weld on the end of the busted cylinder, cut to the correct length. You woulnd't have to modify the tractor at all, just watch that the barrell doesn't hit the end of the loader arm when dumping....Mike
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Post by Rich Waugh on Oct 14, 2011 18:24:33 GMT -5
I make it a point to only back drag with the bucket fully curled up, never down, but that doesn't mean I didn't have a brain fart and do it. Only thing is, at the time the issue came up I was in the middle of loading dozens of buckets of dirt - hadn't been doing any smoothing at that point. Baffles me.
Ah well, a kindly friend has offered me a deal on a pair of new OEM cylinders I just can't pass up, so I'll just be replacing them. No muss, no fuss, except I'll be fiddling the bucket dump geometry a hair to eliminate a rod flexing problem that is the result of piss poor Chinese engineering. Just need to relocate the attachment on the bucket about an inch to take care of things.
I do think you're analysis of the stress issue is correct. I had planned to gusset the arm to handle the stress concentration, but now that won't be necessary.
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Post by mrmikey on Oct 14, 2011 19:00:40 GMT -5
Glad you got 'er fixed Rich or at least you're heading in that direction......Mike
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Post by affordable on Oct 15, 2011 17:45:51 GMT -5
Rich, glad we could lend a hand in helping you out, I appreciate the referrels you have sent us over the years. Tommy Affordable Tractor Sales "Your Jinma Parts Superstore" www.affordabletractorsalesco.com |
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Post by Rich Waugh on Oct 15, 2011 22:07:26 GMT -5
All your advice and assistance over the past couple of years has made a world of difference in my enjoyment of my Jinma, Tommy. I see how much time and effort you put into helping out people on these forums and that's why I continue to refer folks to you - you try to do right by people. I appreciate that.
Assuming I get the flawed Chinese loader geometry straightened out, I'll post the pictures and/or drawings of what it takes to do it. I'll email them to you, also.
Thanks again!
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Post by bradblazer on Oct 16, 2011 8:25:41 GMT -5
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Post by Rich Waugh on Oct 16, 2011 17:41:20 GMT -5
I couldn't tell you about that problem, Brad. I've been banned from ol' Joe's lame-ass site so I can't read the stuff, even. ;D Probably the same, though. Rob had the same issue with Loretta's ZL-20 loader on her 284 Jinma. He fixed hers, so I should be able to fix mine. Naturally, it would go much quicker if Rob just came and fixed mine, but I doubt he's gonna do that.  Rich |
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