Jinma chipper problem/question

jbirdmotox · Apr 24, 2008

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 · Apr 24, 2008

"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 · Apr 24, 2008

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 · Apr 24, 2008

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 · Apr 24, 2008

JerryK said:
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 · Apr 24, 2008

wedge40 said:
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 · Apr 25, 2008

JerryK said:
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 · Apr 25, 2008

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 · Apr 25, 2008

JerryK said:
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 · Apr 25, 2008

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