Chipper Jinma wood chipper disk moved within cage

fawcekj · Oct 17, 2005

I need some advice on my JM6. I've run about 10cuyds of wood through it in the last couple weeks, mix of dry and green wood, up to about 5" dia. long leaf pine mostly (over 4.5" and my tractor stalls. ) Anyway its been great, and besides I stall trying to lift a 5"x 30' pine tree too. I installed the set screws in the feed roller drive and it has been working well. My current problem is that this weekend after running for a couple hours, it started making a banging noise, and I quickly shut it down. /forums/images/graemlins/confused.gif When I got it back to the barn the chipper blades were hitting the base anvil. So I adjusted the anvil to 0.20 mid way between the spec. 0.10 to 0.3. I also rotated the blades to the good side, about a quarter inch on the outer edge was dinged and the rest of edge was slightly rounded I assume due to impact with the anvil. put the unit back together and engaged the PTO. Slowly increased PTO speed and by the time I got to about 300 rpm it started banging again. It looks like the main shaft for the 24" disk has shifted on its pillow blocks, and the disk has moved forward in the chip cage. There are two set screws on each pillow block bearing, and one was almost falling out, the others were not tight.
Has anyone else had this problem?
Does anyone know what position the disk should be within the chip cage? I was thinking that I would just center it front to back , but then maybe it should be closer to the front to keep the chips cleared to the back of the disk?
Any recommendations to keep it from happening again? LocTight?

beenthere · Oct 17, 2005

From the mental 'picture' I get of what you described, there should be a whole lot more holding the chipper head in its place than a couple set screws. The mass of that head must be pretty big, and set screws seem like would not hold it very well.

Again, just the 'picture' I am getting here. /forums/images/graemlins/wink.gif

fawcekj · Oct 17, 2005

See attached picture, showing the pillow blocks and main shaft.

Affordable · Oct 17, 2005

The flywheel should be centered,the set screws are all that hold the shaft in position ,also make sure that the pillow block bearings are secured in place.We have sold over a hundred of these woodchippers this year,you have to keep the rpms up to keep the woodchipper from clogging up,also check to make sure the main shaft is not bent.Get it centered and slowly turn it by hand to make sure the flywheel is turning straight.We have all the parts for these woodchippers if you every need any

Tommy
Affordable Tractor Sales

fawcekj · Oct 17, 2005

Here is a picture showing the access to the back of the chipper disk. My question on this is how far from the cage to the edge of the fan blades should the disk be adjusted to? /forums/images/graemlins/confused.gif

fawcekj · Oct 17, 2005

Thanks, Jim.
I thought that I would just center it front to back but wanted to get a second opinion. I've read most of your post on this unit (you and others on this site have been a great resource) and I agree it was running great until the set screws worked themselves loose. I guess I need to get some more loctite.
Thanks again for you advice,
Keith /forums/images/graemlins/laugh.gif

inveresk · Oct 17, 2005

Fawcekj, I'm considering buying a Jinma 6 chipper so did a search on TBN on reliability. This thread notes the various custom modifications recommended by TBN members to ensure trouble free running. I seem to recollect that the problem you are facing was dealt with somewhere in this thread but I can't recollect where.

Jinma chipper

Ranch_Hand_Supp · Oct 17, 2005

fawcekj, I think???.... When the shaft walked back it took the flywheel with it...as you know. When that happen it closed the gap between the knive and anvil and before it started hitting [noise] the wood chips were getting smaller and it could not keep of with the feed roller....engine stall.

If the flywheel is still tight on the end of the shaft ?......and if the belt pulley has has not moved on the shaft.....when you move the flywheel that should bring the belts back into alignment ..close. I justed looked at one I have in the shop I kept for a demo and it looks like it is as close to the tractor side as you can get without touching...... looks like it would have to be that way so it could make a fan box and blow.

Play with your gap setting on the knives....try to match size of chip to HP.....RPM's have to stay up...... using a dime will get you close to start and maybe OK on some wood or all??

Try to turn by hand before PTO engagement. [slide pto off]

Sharp knives are a must.

Watch Fingers !!!!!

Let us know

Ronald
Ranch Hand Supply

fawcekj · Oct 18, 2005

Tommy,
Sorry about the post calling you Jim. I must have had someone else on my brain. Anyway I got the chipper adjusted by moving the pillow blocks so that the flywheel fan bars are about 3/16" from the back of the shroud (or cage) at both the inner and outer arc of the flywheel. thighen all set screws with loctite applied. powered her up and she's back eating up trees like crazy. Thanks again for your quick reply.

Ronald,
About 3/16" was as far back as I could get the flywheel to the shroud, and it seems to be blowing the chips out about the same as it did when first used. All fingers still intact, just one little nick. Thanks for the info.

Goerge,
thanks for the info, I read through the old post and there was a mention of the main shaft pulley moving and that helped in getting the pulley back in line after getting the flywheel back in line. For the money this is a great machine. I researched chippers all over the net and was not able to find any other chipper that was as well built (simple design,heavy duty steel, mechanical feed roller, 6" dia, off the shelf bearings, belts, bolts, ect) But it does require keeping an eye on set screws, and nuts bolts are tighten. I think Loctite will help.
Keith /forums/images/graemlins/laugh.gif

VT_Kioti · Oct 20, 2005

I don't want to go too far off topic but I am a little confused. What did you mean by "I installed the set screws in the feed roller drive and it has been working well."
I have the same chipper (Jinma 6) and I have not read anything about set screws in the feed roller drive. I have made the mods on the ends of the roller drive shaft and it has been working quit well. Have I missed something?

Thanks
Al