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  1. #1
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    Oct 2005
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    GA

    Default Jinma (Farm Pro) chipper mods

    I'm just curious if anyone has gone beyond the standard mods with these chippers. I'm kinda a reliability/convenience freak with anything I get into. For example, I bought my Jinma (actually a Farm Pro from Homier but identical to the Jinma) in the fall of 2005 but started using it only in March 2007 because I didn't want to start using it and then have it break down in the middle of a job. What I intended to do was control the chipper with hydraulics. I still plan to do that but time has been limited. So, I decided that I needed to go ahead and do something with it and start using it. I started my mods the 1st of March and finished them within a few days. They were pretty simple so they went very fast. They included replacing the standard knub drive shaft things with #6 universal joints and sliding bar. This required moving the gear reduction drive farther away from its normal location but I would have to do that anyway when I add the hydraulic motor to it later. So, it was one step towards the hydraulic mod. The drive belt is now 53 inches instead of the original 36 inches so I also added an idler pulley in line so that the belt would not flop too much. I added a steel plate (14 gauge sheetmetal) over the drive pulley and part of the belt to keep chips off the belt and out of the pulley. I added roller bearings to the drive feed disengagement clutch. I didn't like the idea of bolts rubbing against the clutch mechanism (even for a short time) while it was turning. For convenience (since my storage is limited) I added the capability of flipping the feed chute up and over the chipper where it can be permanently stored during non-use times. This was a really simple mod that reduced the amount of room needed to store the chipper by about 2-1/2 feet in the rear. Flipping it up or down can be accomplished in less than one minute (most of which is taken up by either removing or installing the two bottom attachment bolt/nut sets).

    I've been using the chipper every day since I finished the mods. I have not had the first problem with the chipper. I would estimate around 80 to 90 hours of use. I have been doing the recommended maintenace and it appears to be right-on. The original blades were resharpened until no longer useful and I am now on my second set of blades. This was expected and seems reasonable for the amount of work done. I find that the chipper is a very heavy duty basic design that is easily modified and with regular maintenance should last for years.

    I'll post some photos of my mods if anyone is interested. I would be really interested to hear about (and see) your mods.

    Terry

  2. #2
    Elite Member woodlandfarms's Avatar
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    Jul 2006
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    3,908
    Location
    Los Angeles / SW Washington
    Tractor
    PowerTrac 1850

    Default Re: Jinma (Farm Pro) chipper mods

    Definitly interested in seeing pictures. I plan to buy one but because I have no conventional PTO I am going to have to operate it hydraulicaly. Looking forward to seeing how and why you have your setup setup...

    Carl
    Power-Trac 1850, grapple, hoe, 90" mower, 72" box blade

  3. #3
    Member
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    Oct 2005
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    Default Re: Jinma (Farm Pro) chipper mods

    Carl,

    I'll post some comments and pics in the morning. It's very late here right now (Eastern Time).

    Terry

  4. #4
    Veteran Member weldingisfun's Avatar
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    Dec 2006
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    1,514
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    West Bell County, Texas
    Tractor
    Mahindra 4500 4WD w/FEL, and Scotts S2048 lawn tractor

    Default Re: Jinma (Farm Pro) chipper mods

    I too would like to see your pictures. You will find lots of mods in this thread.
    http://www.tractorbynet.com/forums/a...ight=stop+burn

  5. #5
    Member
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    Oct 2005
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    GA

    Default Re: Jinma (Farm Pro) chipper mods

    Weldingisfun,

    That was one of the threads that provided inspiration for my mods. Some good stuff.

    Terry

  6. #6
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    Oct 2005
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    GA

    Default Re: Jinma (Farm Pro) chipper mods

    Here is a photo of the cover plate. It shows the plate, the idler pulley and the long v-belt. It also shows the relief that had to be made to accommodate the spring action. Another photo shows how the idler pulley bracket was made.
    Attached Images Attached Images

  7. #7
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    Default Re: Jinma (Farm Pro) chipper mods

    Here are some views of the drive shaft mod. It shows the set-back of the gear reduction unit, the elevation screws, v-belt tension screws, etc. The gear reduction unit is sitting on a 5/16 thick by 6 inch wide cold-rolled steel (very strong) plate that is bolted to the chipper frame using the original adjustment holes. This allows the same v-belt adjustment as before. You may also notice that the plate that the gear reduction unit originally sat upon has been turned upside down and the direction reversed. This allowed the use of the bent piece of the plate as the push-point for tightening the v-belt. I had to drill and tap two holes for the adjustment bolts. I used all of the original hardware (exept for the knub joints and shafting) and bolted the assembly rather than welding it as it will be disassembled later for the hydraulic mods. You may also notice an additional small plate under the gear reduction unit. This plate gave me an extra 5/16 inch clearance to keep the v-belt from hitting the chipper frame during flop. However, after I put the idler pulley on to prevent flop, the plate became unnecessary as the idler pulley lifted the belt 1 inch above the chipper frame and prevented any flop. In one of the photos you can see the marked location and mounting hole (under the drive shaft) for the idler pulley.
    Attached Images Attached Images

  8. #8
    Member
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    Default Re: Jinma (Farm Pro) chipper mods

    Here are some photos showing how the feed chute can be raised or lowered. The photos show it in the up and down positions. When down, the feed chute is secured to the chipper using only the two bottom sets of bolts/nuts as the hinges serve to secure the top of the chute. They also show the hinges that allow this and the bracket that secures the feed chute to the exhaust chute support. The bracket is made of two pieces of 1-1/4 inch by 1/4 inch cold-rolled twisted steel. This is a very rigid Vee shape that allows the chipper to be either transported or stored in the up position without having to worry about safety (having it fall unexpectedly). You may also notice the little metal enclosure that was made to cover the gear reduction unit. Anybody know where I can find matching yellow paint?
    Attached Images Attached Images

  9. #9
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    Default Re: Jinma (Farm Pro) chipper mods

    Here are some more photos of the hinges that allow the feed chute to be raised or lowered.
    Attached Images Attached Images

  10. #10
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    Default Re: Jinma (Farm Pro) chipper mods

    Here are some more photos showing the cover I made for the gear reduction unit. The first photo shows the reduction unit sitting outside of the original cover. It also shows the cutouts I had to make in the original cover to accommodate the drive shaft and v-belt.
    Attached Images Attached Images

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