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Post by traktorz on Aug 31, 2012 1:48:11 GMT -5
-Is the boom swing cylinders mount the weakest spot of the entire backhoe? -Why on earth are there no zerks here? These joints certainly needs grease too! -Why creating an unique mount with inferior mechanical strength, rather than reusing a standard cylinder mount? -Are there any ideas available here on redesigning the boom swing cylinder mount to a standardized one, in order to prevent those from repeatedly breaking? (We're prepared to trade off some boom swing angle and compactness with an improved mount). These pictures tells the sad story of a bad design in big needs for improvements!     |
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Post by Rich Waugh on Aug 31, 2012 6:19:43 GMT -5
Looks to me as tough that collar and pivot-lug assembly was built up by welding and would have worked fine if it had been a machined or forged piece to start with. However, it looks like something I'd just weld back together and put back into service as is, and wait for it to break again.
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Post by mrmikey on Aug 31, 2012 17:11:17 GMT -5
Ditto, V it out a bit either the busted ones or get hold of some new round stock, and weld it back on....Mike
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Post by traktorz on Sept 1, 2012 2:17:19 GMT -5
We got the first broken cylinder replaced, as seen on the pictures. However, as you both suggests, this time we did weld the broken pivot-lugs back, and we'll now have to see how long that will last.
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Post by Ronmar on Sept 22, 2012 15:47:51 GMT -5
What BH are these on? It appears that the cylinders are plummed for dual action?
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Post by traktorz on Oct 1, 2012 15:52:04 GMT -5
What BH are these on? It appears that the cylinders are plummed for dual action? We have Backhoe model LW7U10 (LW-7 from year 2010) made by Shandong Sunco Agricultural Equipment Technology Co Ltd. Yes, it has dual swing cylinders. However, we plan to insert restrictors to slow down the swing speed, but havent decided where to add those yet. I can tell that we recently did break the boom cylinder piston and will repair it but that will cause a limited depth dig, since the piston will becom 3 cm shorter! In the meantime we have a replacement cylinder, but that older type of cylinder had larger hydraulic fittings. We therefore had to custom make adapters M18x1.5m down to M16x1.5mm to fit the existing hoses.    |
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Post by bradblazer on Dec 11, 2012 23:30:58 GMT -5
The swing cylinders see enormous stress if the valve is released too fast while swinging. Does yours have a cushion valve (crossover relief valve) in the swing circuit? Mine has one and I've still torn up the swing chain pins. Anyhow that valve is supposed to cushion the motion when the swing valve is released. Nice coincidence when I searched info on that type of valve I came across the manual for my old backhoe that manufacturer finally posted online. It shows a cushion valve on the swing circuit. www.amerequip.com/assets/documents/730-backhoe.pdfHere is an example of the valve for sale in the US. www.surpluscenter.com/item.asp?item=9-4019-75-H&catname=hydraulic |
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Post by bradblazer on Dec 11, 2012 23:37:38 GMT -5
You might be able to remove the mount bushings and drill and tap for an M6 zerk.
On the bright side it looks like you are working your tractor quite a bit.
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