Jinma chipper problem/question

[jbirdmotox]

I have a 6" Jinma chipper and have big problems with blade to anvil clearance. I also have problems with blade to housing clearance. The problem is I have no clearance. The blades hit the rear housing it spots and the anvil on every pass. These problems started after about 15 minutes of use. I have tried using fender washers between the chipper outer rim and the rear housing to create clearance but I don't like this option. On the anvil I have no adjustment other than maybe machining down the width of the anvil.

Here's my question for those with one of these things: How much clearance do you have between the blades and you rear housing?

I'm thinking that when assembled the shaft to which the flywheel is attached was not pushed far enough into the pillow bearings (toward the tractor). If it was pushing in further this would create the blade clearance with the anvil and the rear housing.

Sorry for the long post.....


Jon

 

[JerryK]

"I'm thinking that when assembled the shaft to which the flywheel is attached was not pushed far enough into the pillow bearings (toward the tractor). If it was pushing in further this would create the blade clearance with the anvil and the rear housing"

The set screws on the pillow blocks could have been loose when you started to use the chipper. That is one of the things you need to look into when you first get your chipper, and they might have allowed the shaft/cutting drum to walk rewards towards the anvil... You could run a straight edge on the surfaces of each pulley and see if they are no longer aligned...

 

[jbirdmotox]

Thanks for the reply. Last night I started the disassembly of the chipper. I got the belts off and then started looking at the flywheel shaft/ pillow bearings. The set screws were all tight and the shaft didn't look like it had "walked" towards the anvil. It does look to me like the shaft could move about 1/4" further into the pillow bearings before hitting a shoulder on the shaft.
I guess that is why I wondering about the clearance other people had. If I could get the shaft to slide in further I would obviously gain 1/4" of clearance all around.
I just dread the thought of splitting this thing in half. Everything is so darn heavy. I have a feeling the flywheel shaft won't move too easily through the pillow bearings....

 

[JerryK]

You might want to email Affordable or Ranch Hand, they are Jinma dealers on this site. They might have torn into one far enought to be able to help you out. They are a great source of parts, too. Good luck, Jerry.


PS: before you fire it up, go thru the whole unit and tighten up everything else. These things may be built like a tank, but I question the quality of the assembly people. And, someone on this site said...."don't lick the paint"

 

[wedge40]

You might want to email Affordable or Ranch Hand, they are Jinma dealers on this site. They might have torn into one far enought to be able to help you out. They are a great source of parts, too. Good luck, Jerry.


PS: before you fire it up, go thru the whole unit and tighten up everything else. These things may be built like a tank, but I question the quality of the assembly people. And, someone on this site said...."don't lick the paint"

Oh oh.. what happens if you lick the paint? LOL

Wedge

 

[JerryK]

Oh oh.. what happens if you lick the paint? LOL

Wedge

Lead poisening.. When I was a kid, I remember chewing on pencils in school, and rolling murcury around in our hands...and rubbing murcury on the Liberty dimes to make them shine. Didn't effect me any.... didn't effect me any.....didn't effect me any......didn't effect me any....didn't effect.........

 

[wedge40]

Lead poisening.. When I was a kid, I remember chewing on pencils in school, and rolling murcury around in our hands...and rubbing murcury on the Liberty dimes to make them shine. Didn't effect me any.... didn't effect me any.....didn't effect me any......didn't effect me any....didn't effect.........

But I was just trying to get er clean.
To quote John Astin "I'm feeling much better now"

Wedge

 

[AlanB]

I have a "non' Jinma, called a Jinma by circle G tractors. Who knows

anyway, My suggestion is to pull the setscrews out of the back pillowblocks.

My disc walked forward on initial run and man was that loud.

Anyway, pull the set screws out.

I walked my flywheel back into place by lifting the feed roller and gently nudging (uh-hum) the flywheel back towards the PTO side of the chipper with a landscaping timber.

There is a raised shoulder on the shaft which acts as a back stop on the "front" pillow block.

Then I took a 1/4" bit, and dimpled the shaft where the set screws would go in the proper location, this could cause problems creating a stress riser in that shaft, but for me, it is an acceptable risk.

I then figured out when I went to put the set screws in that the threads in the sleeves were dorked up, so I ground a starting tap to a bottoming tap and re-did the threads. (should have pulled the sleeves but just looked like more work then I was willing to do)

I then put in american set screws.

Have not run it yet, but set it up to where my closest blade is at .030, and the other blade is about .033 from the anvil.

I happened to use two plastic cards I had sitting there as feeler gauges put together to equal .030. If I had to do it again, I would hunt a little more for one something the right thickness that covered the entire anvil and I would bend it into an L so it laid there while I moved the disc a bit back and forth to set it accurately, it is a bit of a pain as the cutter blade is on an angle in relationship to the anvil, but with two folks and a bit of patience it was not too bad.

Good luck.

 

[Nuru]

Lead poisening.. When I was a kid, I remember chewing on pencils in school, and rolling murcury around in our hands...and rubbing murcury on the Liberty dimes to make them shine. Didn't effect me any.... didn't effect me any.....didn't effect me any......didn't effect me any....didn't effect.........

murcury probably wouldn't hurt you but mercury sure might!

I seem to remember being allowed to play around with Mercury too!

Is that why I have some issues with some politicians - due to their consistency being similar to mercury?

 

[bjr]

Do a search on Jinma chippers on this site. This has been well discussed. There should be enough information to get you going. Implements of all sorts require wrenching and lifting moving heavy pieces; welding cutting fabricating; parts buying and yes that slippery nasty get on everything stuff called grease. This has been my experience of tractor and implement/farming operation. There have been days when I didn't have to fix anything and it was then I got worried. What I'm missing? Something just has to quit, but, what? bjr

 

[chuck4389]

Had that problem with mine too.
The pillow blocks had shifted slightly due to a "rubber wristed" assembler at the factory. The flywheel was not running parallel. I adjusted the rear clearance with a suitable pry bar, tightened the pillow block mounting bolts, and that cured the problem. Of course, I reset the blade and anvil clearance after that.

 

[jbirdmotox]

Thanks for all the replies.
I got it fixed over the weekend. Basically the flywheel shaft was not fully seated all the way to it's shoulder. The shaft did not walk backward but the shaft was bound up in the two pillow bearings. Whoever put it together didn't take much care to do the job right.
I took the chipper totally apart, flywheel off and the whole deal. I was able to pound the shaft out of the bearings with a sledge hammer. I cleaned all the surfaces, greased, and tried to slide it back together. No matter how hard I hit the shaft it would not totally seat to the shoulder. Then I decided I would remove the bearing closest to the pulley and try again. Now it slid in with little effort. Then I installed the other bearing and tightened everything up. Now I have the clearance I need.
Looking back I prob. could have just removed the bearing nearest the pulley, pounded the flywheel into position, and then installed the bearing again. This would have saved me a couple hours but such is life......

Thanks, Jon
in New Hampshire

 

[Bill Barrett]

So Jon, how does it work? Love mine!

 

[jbirdmotox]

Bill, I haven't had a chance to fire it up since I got it back together. I will say that the 30 minutes I used it, between messing around with the whole clearance thing, it worked pretty well.
Before dealing with the flywheel clearance problem I had a bunch of problems with the feed roller getting stuck in the "up" position. It was getting stuck even on small stuff. I basically had to take the feed roller assembly apart and replace it's pillow bearing mounting bolts. It was getting stuck on the bolt heads. I replaced them with button head bolts so they wouldn't get hung up.

I don't want to start a Jinma flame but I have chipped for 30 minutes and have many hours in trying to get the thing to work properly.

I'm a firm believer in "getting what you pay for". I saved some money on the front end but have paid in others.....

Would I buy another Chinese made implement?
Ask me in a month if the chipper is still running smooth......

Jon

 

[Bill Barrett]

Bill, I haven't had a chance to fire it up since I got it back together. I will say that the 30 minutes I used it, between messing around with the whole clearance thing, it worked pretty well.
Before dealing with the flywheel clearance problem I had a bunch of problems with the feed roller getting stuck in the "up" position. It was getting stuck even on small stuff. I basically had to take the feed roller assembly apart and replace it's pillow bearing mounting bolts. It was getting stuck on the bolt heads. I replaced them with button head bolts so they wouldn't get hung up.

I don't want to start a Jinma flame but I have chipped for 30 minutes and have many hours in trying to get the thing to work properly.

I'm a firm believer in "getting what you pay for". I saved some money on the front end but have paid in others.....

Would I buy another Chinese made implement?
Ask me in a month if the chipper is still running smooth......

Jon

Hope all goes well for you!
I bought a high end tig tungsten sharpener from a industrial company, about the size of a Dremel tool for around 300 bucks, made in China. Hard to get away from China products.

 

[allen in texas]

I don't have one and don't need one but I looked at the video on the Liberty site.
The chain that secures the PTO shaft shield is just flying free and the shield is spinning with the shaft.

Looks like an operator goof up there. Hope that pretty girl doesn't get her hair caught in it.

Where's the safety police when you need them?

 

[wedge40]

I don't have one and don't need one but I looked at the video on the Liberty site.
The chain that secures the PTO shaft shield is just flying free and the shield is spinning with the shaft.

Looks like an operator goof up there. Hope that pretty girl doesn't get her hair caught in it.

Where's the safety police when you need them?

the chain is more to keep the shaft together when not in use. I'm in the process of trying to figure out how to make mine do that. I dont consider it a big deal because anybody who squeezes them self in between the chipper and tractor while to PTO is running belongs in the darwin club.

Wedge

 

[Charlesaf3]

was it a "pre-serviced" jinma out of curiousity? ie one of the ones some of the dealers on here sell that were re-assembled?

I've thought of getting a jinma chipper, but the minor time savings involved doesn't justify becoming a chipper mechanic.

 

[Bill Barrett]

was it a "pre-serviced" jinma out of curiousity? ie one of the ones some of the dealers on here sell that were re-assembled?

I've thought of getting a jinma chipper, but the minor time savings involved doesn't justify becoming a chipper mechanic.

Are you asking me? If so yes, well worth the little money.

 

[allen in texas]

I thought the chain was to keep the shield from turning but yeah, no one should be in that area.

I tie the chain to my pto shield and the shaft shield does not turn.