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Disc brakes on Jinma 284

Forum Forums Tractor Troubleshooting Disc brakes on Jinma 284

This topic contains 12 replies, has 4 voices, and was last updated by  Piper184 3 months, 2 weeks ago.

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  • #47174

    Piper184
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    Has anyone had the disc brakes apart on a 284?

    Mine are acting abnormally. Grabbing or not being effective. It is hit or miss when you step on the pedal as to what might happen. I don’t use them often, but it is kind of important they work when needed.

    I have adjusted them as per the manual and did notice that one side gets firm with very little travel of the rod and the other side seems to have “rough spots” in the travel and it moves farther than the other side. However it will lock the wheel and the other side will not.

    In looking at the parts diagram it would appear that there are two plates that are separated by balls. When the brakes are applied the plates rotate in opposite directions and the balls (riding on ramps?) force the plates apart and into the friction pads.

    I am wondering if rust/corrosion inside the brake units could be the problem. Looks like removal of the floorboards will give access to the outer cover.

    Once the outer cover is off does anyone know if the plates can all be removed from the end or do you need to take the whole assembly off?

    Any advice would be appreciated

  • #47175

    DavidPrivett
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    I am assuming that your tractor has dry brakes , if so take off the covers ,I think you will see two small shoes. They pivot one end and there is a cam on the other end that pushes the shoes onto the drum . I have a dong feng le 204a so I may be incorrect on what I am telling you. But mine the shaft that has the cam was dry and rusted as it went thru the housing so the brakes on that side did not work properly . took that shaft out used some emery paper on it lubed it lightly reassembled and it is good to go. Hopefully yours is similar.

  • #47179

    Piper184
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    According to my manual there were drum brakes like you describe but the ones on my tractor are disc brakes. A different configuration. I have never seen anything quite like this before and have only the images in the manual to go by. I won’t know for sure about the expander ball part of it until I get it apart. Drum brakes I understand, disc brakes on vehicles I understand, these, not so much….

  • #47180
    ronjin
    ronjin
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    Piper, have a picture of the 284 brakes, but can’t figure out how to post it for you.

     

    ronjin

  • #47181

    Piper184
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    without knowing how you are posting replies, I can’t give you detailed instructions.

    However, if you are using a PC and logging on to the web site, then you will be typing a reply in a box near the bottom of the page that this thread is on.  Below the box will be the emoji’s, a box to check if you want to be Notified of replies via email and a warning about Maximum file size allowed is 1000 KB.

    Below that is

    Attachments:

    And a Browse button.

    You click on the browse button then you navigate the files of your computer to find the picture you want to attach and click on that. It will take a minute or two to upload, then your picture will appear on the forum with your message once you click the Submit button.

    You have to be sure that your photo is less than 1 MB in size. There are many ways to reduce the size of a photo depending on what operating system you have and what software you may have on your PC.

    Hope this helps.

  • #47182
    ronjin
    ronjin
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    Here is picture of 284 brake shoes:

    Attachments:
    You must be logged in to view attached files.

    ronjin

  • #47184

    Piper184
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    Ah Ha!

    This is pretty much what I had pictured in my mind based on the parts book drawings. This helps clear it up.

    Based on the feel at the pedals I suspect there is rust/corrosion in the area where the balls contact the plates. Possibly a broken spring or two.

    I am guessing there is no lube on any of the pivot points or the balls/ramps. I am guessing that some kind of lube would be a good idea for sliding metal parts.

    What do you think would be best, a light coat of wheel bearing grease or a white grease like lubriplate?

    Did you have to take the whole housing off to get these out or will they come out the end plate?

    Thanks!

  • #47185
    ronjin
    ronjin
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    Piper,

    If you want to send me a PM with your Email address, I’ll send you a PDF file containing pictures and notes of the disassembly.

    ronjin

  • #47186

    Piper184
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    I don’t see any options for PM on this site.

    stuart [at] harnerfarm [dot] net

  • #47187

    DavidPrivett
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    glad you were able to post the pictures of those brakes, never seen that before, interesting . When you decide to lube things up use hi – temp. lube.

  • #47188
    ronjin
    ronjin
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    Piper,

    It has been sent.  Let me know if you do not get it and I will try again.

    ronjin

  • #47195
    kenotractors
    kenotractors
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    Hi, the brake system on a 284 is a dry system-it sounds like the seal inside there might have gone bad allowing fluid into the Brake Housing. The best way to check this-there are bolts on the bottom of the break housing, if you take them out and fluid runs out then you are going to have to replace the ceramic discs and the inner seal.

     

    Nan Pitzer
    Keno Tractors
    parts@kenotractors.com
    866-363-8193
    Phone hours: M-F 8am to 5:30pm PST Sat 9am to 1pm PST

  • #47196

    Piper184
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    Nope, already checked that. No fluid came out.

    The feel on the pedal is more like the pressure plates are not rotating smoothly. I suspect rust or other corrosion on the plates or balls. Another possibility is a broken pressure plate spring.

    I won’t know until I get it apart.

     

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