GuglioLS
Administrator
Jinma354 LE
Posts: 1,276
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Post by GuglioLS on Mar 29, 2009 22:18:58 GMT -5
Nice chip shield Rob.
I wish it were in DXF format so I could have it plasma cut. Cool idea to use those 3/4" metal strips side by side like that. So I guess it works good keeping the chips out of the belt then? I have that problem too where every once in a while a strand or chip or whatever gets caught between the belt and pulley knocking off the belt or flipping it sideways. Looks like you solved that for good. Thanks for sharing that helpful tip.
Larry
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Post by stumppuller on Apr 4, 2009 10:45:31 GMT -5
As I mentioned, I sharpened the feed roll teeth on the chipper which greatly improved feeding brush, but I was concerned about what would be the "fuse" if the system overloads. Since sharpening, the belt has rolled once (chips?) and broken once (of course : - 1st fuse - and now the feed roll drive shaft snapped in two at the CV joint neck - 2nd fuse. Surprising, since this is about 3/4" dia. steel at that location. I'm guessing that a steady diet of 4" - 6" dia. limbs is just too much for it, even though the specs say it can take that size limb. After repairing it I'll limit the chipper to a diet of brush and limbs under 4" for safety sake. I'm jus glad that the worm drive gear box didn't take a hit. Bruce
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Post by stumppuller on Sept 5, 2009 18:28:27 GMT -5
Since the last shaft failure, I've chipped about 10 hours more and Bingo! ....another shaft failure at the "square ball joint" on the other end of the shaft. This is definately a weak spot in the chipper design. I recall seeing a post somewhere about a retrofit using a real, minature universal joint just like auto drive shafts use. Does anybody have a lead on where to get these smaller sized U-Joints?
Thanks,
Bruce
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GuglioLS
Administrator
Jinma354 LE
Posts: 1,276
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Post by GuglioLS on Sept 5, 2009 19:53:50 GMT -5
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GuglioLS
Administrator
Jinma354 LE
Posts: 1,276
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Post by GuglioLS on Sept 5, 2009 20:44:17 GMT -5
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Post by stumppuller on Sept 6, 2009 14:36:07 GMT -5
Thanks Larry, That's what I was looking for.
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Post by Ronmar on Mar 30, 2010 22:11:40 GMT -5
Well I finally broke down and got myself one of these things. The production date stamped on the label is only about 3 months ago, so it is fresh off the boat so to speak. There are a couple of differences from the one Rob posted about. Probably the biggest difference is that the wobble joints on the feedroller driveshaft have been replaced with U joints. They have welded in place pins and no lube points, but look pretty robust. The next difference is no pull cables. There is a push rod attached to the gearbox side of the yellow safety bar down near the bottom. this pushrod runs to a bell crank back alongside the feed chute. the bellcrank has one long arm with a slotted lever on it that fits over the feed roller engage/disengage lever. Pushing down anywhere on the safety bar causes the bellcrank to force the drive lever out of gear. A springloaded bar with a notch on it traps the lever in the disengaged position. Very simple, and appears to be pretty effective. The feedroller teeth were pretty sharp, and after replacing the setscrews and grease fittings(provided by dealer) and setting the anvil plate gap at about .030", the thing was a real monster for the initial hour I ran it. It chipped a pile about 10' in diameter and about 6' high of fir branches up to about 3" in diameter without even working hard. The teeth seemed to pull in everything I threw into the chute without any real difficulty, even big armfulls of branch tips and fir needles. I did take a pass on the teeth with a grinder after this initial trial so I will see if it works any better after these rains pass and things dry out a bit. The shrouds around the feed roller are a joke as Rob mentioned and I am in the process of making tighter fitting replacements to keep junk out of the feed roller drive belt area. I will post some pics of how I do that when i get it done. I also need to show my wife how to use it as it was chipping faster than I could feed it by myself:)
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Post by affordable on Mar 31, 2010 5:01:24 GMT -5
Make sure that if and when you needs parts you confirm they will fit yours,the Jinma woodchipper parts look similier but not all will fit including the blades the bolt holes are a little different Tommy Affordable Tractor Sales "Your Jinma Parts Superstore" www.affordabletractorsalesco.com
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Post by Ronmar on Mar 31, 2010 10:32:32 GMT -5
Thanks Tommy, good to know...
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Post by Ronmar on Apr 1, 2010 23:20:23 GMT -5
Well here is my replacement shroud. It is made of some 14GA plate I had left over from another project. The first pic is of the top. I welded a plate across the gap between the feed chute and the top edge of the rear plate of the blower/chipper assembly. on the ends of this I welded two short tabs that the side plates can bolt to. At the bottom of the open area on either side of the feed chute I welded 2 tabs at an angle that the bottom edge of the side plates wedge down into. I cut pieces of plate to match the side openings and into the bottom of these I cut angled slots for the feed roller shaft to rise up into. I tried to make these as close a tollerance fit to the shaft as possible to reduce the possibility of debris making it thru. The plates are attached with two 1/4-20 screws at the top of each plate. Here is one in place. The other is basically a mirror image of this one. Ran it tonight with the new plates in place for about an hour with virtually no debris to be found in the feedroller drive area. I have some scrap electrical safety mat that I plan on attaching to the feed roller lift arms that will completely seal the slots above and below wherever the feedroller shaft happens to be riding, but so far I am pleased. Tonight I tried it with the PTO in 1000 RPM range and the engine around 1100 RPM. Pretty quiet and the engine delivers enough HP in this configuration to eat up to about 3" limbs with virtually no RPM change. That is untill I accidently fed it a piece of wire that found it's way into the pile. This wiped out the blade cutting edge and really effected chipping feed and performance. Plus unwinding what was left insice from the main shaft was no fun either... This thing sure is cool when sharp though. Really sorry I waited so long to get one...
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Post by bradblazer on Apr 3, 2010 8:31:43 GMT -5
Congrats on the new chipper! Your mods look really well done.
Sorry about the wire. I've not had one quite that bad but I have hit plenty of metal with mowers, etc. Old fencelines with half-buried barbed wire that alternates between super-strong and rusted through hold a special place in my heart. Can the blades and cutting bar be flipped before you need to resharpen? Might at least have to remove some burrs for them to fit right?
Brad
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Post by Ronmar on Apr 3, 2010 13:39:11 GMT -5
Thanks
Yes the blades can be flipped, but I opted to sharpen the damaged side on this occasion to see just how long it takes. I did this last night starting with a gie grinder to take some rough cuts, then finished up the process with a belt sander. The wide cutting face on the blades is both good and bad. It is good in that it is wide enough to allow you to easlly hold the angle as you remove metal. It is bad in that it takes a while to cut that wide face back enough to leave a clean undamaged edge without overheating the blade material. It took me a little over an hour to remove the damage and about an hour total to remove and replace the blades... Back to chipping up the mess I made last weekend:)
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Post by Ronmar on Apr 14, 2010 19:36:43 GMT -5
Just an update, the narrow side plate slots work great with no other guard really needed to keep debris out of the feed gearbox drive belt area. Chipped a 6' X 4' X 4' high pile out of all the debris I cut around the house, and not a bit made it into the belt drive, so I think I am going to call this one dun...
The feedroller disengage mechanism dosn't really want to disengauge when the feedroller is under load, so I may make some changes here as this is a potential safety issue. Perhaps a controllable idler pully to loosen the drive belt tension to stop the feed mechanism. I am very happy with the chipping performance. This thing is WAY faster than burning:)
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Post by Rich Waugh on Apr 15, 2010 0:19:45 GMT -5
You're beginning to convince me that Ii need one of these things to clear my new land. Is the one you got a Jinma or something else? It sounds as though it works really well for you with the shroud mod, which isn't much to have to do.
Rich
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Post by Ronmar on Apr 15, 2010 22:35:27 GMT -5
I am not really sure, as I don't really know allthe differences between the "jinma" and the clones. It says "woodchipper CE" on the name plate and a model number CH 6. Irregardless of manufacturer, I am thinking these things use VERY similar components. But as Tommy pointed out, there are variations in some of the parts, such as cutter blades.
IT does have a massive flywheel, and that is probably the most important part, and the feedroller drive on mine appears to be more robust than some older models I have read about.
Hands down, it is a real time saver over burning. If I had to burn the waste I generated from the trees I just cut down, I would be at it for several days, of long term commitment keeping a burn pile burning green limbs cleanly. Wife and I did it all in about 3.5 hours of chipping over 2 days. It works better with 2 people, as it eats the stuff faster than I could feed it by myself, and you have a usefull product after you are done...
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