Chipper Jinma Chipper Fix

weldingisfun · Mar 24, 2007

I may have found the solution to the problem of branches getting into the feed roller drive belt and pulleys. Pictures 1 and 2 show what I did. It is temporary right now. I want to put about 5 more hours on it before I fabricate a metal cover.
What I did was cut a heavy piece of cardboard to fit over the area housing the belt and the drive pulley. I fixed it in place with some of that gorilla duct tape. Tough stuff, that gorilla tape. Since putting the cover on and using the chipper for about 10 or 12 hours no problems. Before the cover, I lost two belts in about 10 hours of operation.
That last picture is a problem I have run into twice now. The right side lift pin mounting bar has bent twice. The first time was worse than this.
Is anyone else having this problem? Did you find a fix?

inveresk · Mar 25, 2007

Is the feed roller area exposed on your chipper? Mine has a yellow painted steel cover supplied as standard and I can't quite understand why you would need to fashion one. I've not had problems with belts and I reckon I have maybe 30 - 40 hours of running since new last year.

Haven't had a problem with the mounting arms but mine are as far back into the housing as the slotted sleeve will allow. I needed to adjust it like this so the standard supplied pto shaft (which was really short) would work. It means the support arms on mine are pretty short so aren't liable to a high degree of bending stress. If yours project a good deal from the housing, the stress will be higher. Getting a shorter pto shaft so the arms aren't extended so far might help.

SOS · Mar 25, 2007

I just took off my cover because of the chips getting in there mainly from small sticks.

Does anyone know the belt size? I want to get an extrat one. I will be in need of a new one soon as mine flipped and wore it bad but I was not planning on fixing it until it broke.

LarryD · Mar 25, 2007

I don't get a lot of debris in the feed roller area, just a few very small pieces and dust. I wonder if the tree species has any bearing on this. I'm probably chipping the same type of trees as inveresk and I routinely run ¼" fir branches through mine without any buildup around the belt.

After my initial use, I noticed some unusual wear on one side of the belt so I spent time alligning the pulleys. 40 or more hours later and I'm still on the factory belt.

I also shortned the lifting arms to fit the PTO supplied and no issues there either. That elongated hole in the arms certainly reduced the strength of that steel bar. Maybe a larger washer would spread the stresses out a bit and help. Or have a bar made with holes that fit your needs.

Propertymaint · Mar 25, 2007

SOS,
The feed roller belt crosses over to a Napa A36.

weldingisfun · Mar 26, 2007

Gates A36 will work too.

weldingisfun · Mar 26, 2007

inveresk said:
Is the feed roller area exposed on your chipper? Mine has a yellow painted steel cover supplied as standard and I can't quite understand why you would need to fashion one. I've not had problems with belts and I reckon I have maybe 30 - 40 hours of running since new last year.
Haven't had a problem with the mounting arms but mine are as far back into the housing as the slotted sleeve will allow. I needed to adjust it like this so the standard supplied pto shaft (which was really short) would work. It means the support arms on mine are pretty short so aren't liable to a high degree of bending stress. If yours project a good deal from the housing, the stress will be higher. Getting a shorter pto shaft so the arms aren't extended so far might help.

I pulled the yellow cover off to show the belt/pulley cover. The branches had been going inside of that yellow cover through the opening between the feed roller and the cover. Ten they would get pulled in between the belt and pulley. That was how I lost the two belts. Not any more with this temp fix.
Glad to hear you haven't had any problems with yours.

Jim Nelson · Apr 8, 2007

After looking at your idea,I rummaged around and found some aluminam sheet and made a cover similar to your design.I drilled pilot holes through the flat stock above the belt and used self tapping screws to secure it.The sheeting I used is about 30 or 40 thousandths thick and easy to work with but seems to work real well.
My biggest complaint was small branches and stringy bark wrapping around behind the drive pulley.