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Thread: Log Splitter Repair
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24th May 2018, 07:56 PM #31Most Valued Member
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Shed,
We have a match on overall length and stud centres, but I need to go over and confirm the ram diameter.
I'll be in touch by PM.
ChrisChris
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25th May 2018, 03:28 PM #32Most Valued Member
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Jack your p/m box is chockers
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26th May 2018, 10:26 PM #33Pink 10EE owner
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Is this a similar one with a different style of ram connection?
https://www.gpttools.com.au/product/image/15273272171093280271.jpg
https://www.gpttools.com.au/productview/58-ton-420cc-hydraulic-log-splitter-petrol-engine-wood-firewood-cutterGold, the colour of choice for the discerning person.
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26th May 2018, 11:32 PM #34Most Valued Member
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That looks quite a bit bigger than mine. 6" ram vs 5". 15hp vs 6.5hp. Although I've never met a log my machine couldn't split. It's got a Honda motor too. We took the ram off today. Here's a pic:
Chris
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27th May 2018, 08:18 AM #35Most Valued Member
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If you do the maths, you quickly realise that some of the claims made by these wood splitter manufacturers are quite ridiculous. 58 tonnes? I don't think so.
Even with my 6" ram running 3000 psi, I can only achieve 38,000Kg. For that log splitter to achieve 58,000Kg with a 6" ram it would need to run at 4500psi. At 5" ram would need to run at about 5600psi. Not likely.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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27th May 2018, 09:13 AM #36Most Valued Member
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Simon l think they use Asian tuns
Chinko workshop presses are rated with same tunnage and have l often have heard firewood collectors using the same measure, most ppl don't have a clue about a ton.
I once got a bloke with bannana back truck to move my shaper down to the shed, he reckoned his truck was rated to 3.5 tonnes so the shaper was craned on and secured, the rear trucks tyres were rubbing on the underside of the tray so badly that he hardly had to use the brakes on the way down the hill.
Asian tuns
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27th May 2018, 09:27 AM #37Diamond Member
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Sorry Simon i think you are wrong. Over the last 10 or so years there has been a trend of increasing system pressure on mobile hydraulic equipment. The increased pressure allows for smaller actuators for the same force, which equals less weight. Pressures of 5-6000 PSI are now common place. The downside i have seen is increased hose and seal failures. That splitter that RC linked to also has a high/low pump setup. The high flow, low pressure pump allows good cylinder speed until it comes in contact with the log and builds up some pressure, then the low flow/ high pressure pump takes over to split the log. That is the same system used in production presses.
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27th May 2018, 10:32 AM #38Most Valued Member
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My sister has the exact same log splitter as Jack. They are a very good splitter but they specifically state the maximum pressure is 3000 psi. So I know for a fact it cannot achieve the 50 tonnes splitting force it claims. I am aware of 2 stage pumps. I have learnt alot about these systems in the last couple of years. The low pressure/high flow side produces a maximum of 900 psi (give or take) and then switches over to the high pressure side, which is around 3000 psi.
Similar to this I just found one Ebay:
https://www.ebay.com.au/itm/New-50-T...EAAOSwPbla6R-Y
Have a look at the specs and you will see what I mean. I guess I can't comment on the splitter in the link above as it does not tell me the actual pressure but I can't see it being any different, especially given it's very cheap compared to Jack's splitter which usually go for around $2200 - $2500 mark.Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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27th May 2018, 10:38 AM #39Most Valued Member
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Here's another one:
https://www.ebay.com.au/itm/Yukon-60...8AAOSwAINa3n-n
Clearly states 3500 psi with a 6" ram it is still not getting 50 ton. I also know it's maximum pressure is 3500psi because if you zoom in on one of the hydraulic hoses, it clearly states max pressure 3500psi.
I guess at 44 tonne it's closer than the others but still not there.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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28th May 2018, 07:46 PM #40Most Valued Member
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I think that the 50 and 60 ton log splitters are a bit of a gimmick, like jack says the 25 ton splitters pretty well split anything, the 50 ton ones you rarely have them over half throttle.
The other thing to consider is what pressure are the relief valves set to?
I have seen bent splitters that the owners had played with the relief valves to get more ooomf in an attempt to split tree stumps and knots in redgum.
cheers, shed
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28th May 2018, 11:39 PM #41Most Valued Member
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I guess you don't know what the relief valve is set to. The valve spool on my splitter I'm building is adjustable to a maximum of 3100 psi BUT it is factory set to 2250psi and I intend leaving it there as I think that will be plenty. I also have a pressure gauge sitting at eye level so I will get a fair idea what pressures will be generated while splitting different sizes and species of timber.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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1st Jun 2018, 12:09 PM #42Most Valued Member
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I went and visited John (shedhappens) yesterday and we did the swap. His ram is identical to mine. Thanks John!
I reckon I'm going to need some shims for proper alignment of the ram and the splitter blade. My log splitter only had one 0.5mm shim fitted to one bolt (I don't think they spent a lot of time aligning the ram). I went to two bearing places and one bolt shop to get some more. None of them stocked shims. I guess there are just too many combinations of ID, OD and thickness to keep in stock. One bloke offered to order in 0.5mm shims for $5 each! No thanks. They can be had for about $1 each on eBay UK, but I'd prefer not to wait that long.
I have brass shim stock in 0.2, 0.4 and 0.5mm. I'm thinking I could make shims using a set of punches my mate has (see pic).
Some Q's:
Would brass be suitable for shimming this job?
Any tricks to using these punches? What do I use as a backing material?
Anyone know where to buy shims at a reasonable price in Oz (preferably Melbourne?)Chris
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1st Jun 2018, 12:44 PM #43Most Valued Member
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G/day jack, why dont you put it in place with 4 flat washers and see where is positioned, if it has to move towards the left then loosen off the nuts so they just snug on one and loose on the side that needs the extra thickness.
Measure with feeler gauges and make the washers the thickness you need or if you can get that thickness shim that you need.
Cheers, shed
ps, it was good to meet you
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1st Jun 2018, 02:29 PM #44Most Valued Member
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That sounds like a plan!
Chris
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1st Jun 2018, 04:33 PM #45Pink 10EE owner
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End grain of wood is typical for use with punches.
Gold, the colour of choice for the discerning person.
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