4WD Repair Jinma 284

[Johnny P]

Rob,

Thanks for that, it's pretty much how I had worked it out. Slight variation on method but much welcomed advice. No, I don't have a manual. I didn't get much at all with my tractor. It has been a case of learning as I go along and trial and error. Have learned a lot from these type of websites.

Thanks

Johnny

 

[3RRL]

Good deal then Johnny,
You should contact Tommy at Affordable Tractor or Ronald at RanchHand Supply.
They have some manuals in stock they could send you. At least you'd have a better idea of some assemblies and a parts list. Although the manuals may not be the greatest, they do help. But that's also why I take a lot of photos when I do stuff like this. It helps when I forgot how something goes together.

 

[Johnny P]

Rob,

Thanks for that. I managed to get it back on today. Went quite well, only lost one ball bearing. Found it on the ground/grass. Thank goodness for strong magnets.

Johnny

 

[JoelD]

Realy nice fix. I could have easily done what you did and probably better, all I'd need to accomplish is
a milling machine and a clue of how to use it
an engineering degree from MIT and 25 years of experience
an imagination to figure the repair approach
the patience necessary to learn from and not repeat every mistake I've ever made

thank you for taking the time to document

supper helpfull

I've not seen the ballbeering coupler before, rather a coupler sleeve

Joel

 

[3RRL]

Joel, you are too kind.
Me, I'm just dumb enough not to know any better.

 

[dcyrilc]

Joel, you are too kind.
Me, I'm just dumb enough not to know any better.

Haha, yea right Rob. How's the weather been? Things drying out any? I'm anxious to hear how the Kama's doing since the rebuild.

 

[jhunt1x]

Rob,
I ran into the same problem with a Yanmar FX28D. In my case the CV joint balls engage the very tip of the output shaft on the transfer case - a very poor design IMO. I was able to fix mine - the first time - by grinding about 1/4" off the worn shaft and shifting everyting backward a little. That lasted for about a year and it did it again.

I had thought of replacing the balls with dowels though I haven't gotten around to it yet. Been using it in 2wd only since the last blowup.

I was also concerned about the "next weakest link" and I'd like to get your thoughts on this: Instead of replacing the balls with something hard that will never wear out, how about replacing the balls with a softer dowel, like the shank of a grade 5 or 8 bolt of the correct diameter? If anything is going to wear, let it be the bolt or dowel which is much easier to replace than the fluted shaft or the coupler on the drive shaft.

BTW, my fluted shaft in the transfer case is about a foot long and doesn't just tap out, you have to split the tractor to get it out.

 

[richg209]

Wow, very impressive stuff. Makes a novice ownwe rlike myself cringe. Is the 4 wd setup similar on the Jinma 224? Would it be prudent to replace the balls with dowels as a precaution?

 

[schmalts]

Rob, great work. I just have to ask, do you think that beefing up that joint may make something else break in an abusive situation? I know we don't abuse our tractors intensionally, but it happens at times. My point is, do you think replacing these items would be easier than what might break in another place? Kind of like a shear pin situation?

 

[3RRL]

Thanks guys,
Regarding the question if the Jinma 224 is set up the same way, my answer is that I presume so. But a dealer could tell you for certain.
As far as the "next weakest link", I really don't know if replacing the balls with dowels necessarily makes that connection stronger than the next link? It may very well still be the weakest link? ... it's just stronger (better) than before. IMHO, the way that ball (or dowel) connection is made, it will remain the weaker link, but of course I am not certain about it. But again, that is my feeling and that's also why I decided to use the dowels without worrying about it. I guess you could say I made what is obviously a "really weak link" (and an obvious problem) into a much better connection than stock. So far, there are not any signs of "the next weakest link" rearing its ugly head.

 

[troyd1000]

Great repair. I had the same problem and put 5/16 x 3/8 dowel pins in the front and the back. It was tough. It took 4 try's. The only way you could get them to go in was to put the front in first and then stick the pins onto the back shaft with grease and then slide it over. If you put the pins in the coupler, they are too long and will not go over the shaft. I tried putting them into the back coupler, and putting the shaft in there last, but the couple needed to go back to far and the pins would push out. Once I put my thinking hat on and did the way I described, it worked the second time. Good thing I ordered 20 pins necause there is snow outside and that is where I was doing the repair. By the way, I got the pins at fastenal for $.25 a piece. My shaft was worn, but I did not get it repaired. I am thinking with the dowel pins, I will not have to. I have not tried it yet, but the shaft felt tight. I will report on how it worked when I use it.

 

[troyd1000]

Well, I just tested it and it did not work. Not sure if the 4wd was not engaging or if something was wrong with my repair. I will have to dig into it and see. I am in Minnesota and it is blizzarding and going to be -20 for the next few days, so I won;t be working on it for a while. Will keep everyone posted when I find something out.

 

[Frank M]

you lost me a bit , are there 6 balls on each end of the drive shaft , what shaft was worn , in the front of the shaft or the rear of the drive shaft , i am trying to under stand ?

 

[3RRL]

Hello guys, I see this thread comes alive now and then.
After re-reading some of the posts, I wanted to say that it's been what, 5 years now since that dowel replacement? Well, I had to let you guys know that we have had zero problems with any of the drive train front or rear. Loretta and I have been using that little Jinma at home on the ranch, and even more so on another piece of property where we are building some small cabins to rent out. I've brought the Kama up there too, and both tractors are used to build driveways, clear and level building sites, dig all the trenches for water, electricity, phone lines and gas lines. And finally, dig all the trenches for footings. Most of that was done with the Jinma and the Nardi Backhoe mounted to it ... so it's always carrying a heavy load, with lot's of stress on the 4 wd drive train, I'm sure. Knock on wood, yeah?
Rob-

 

[JohnsJinma]

Hello, this is John from John's Jinma. johnstractor

I lost my 4WD last year on my 284, and plan to tackle the repair after spring planting. I really like the idea of replacing the 8mm balls with rods.

Does anyone have access to the original pictures from this thread? They would be much appreciated.

John

 

[Ricks284]

Hello, this is John from John's Jinma. johnstractor

I lost my 4WD last year on my 284, and plan to tackle the repair after spring planting. I really like the idea of replacing the 8mm balls with rods.

Does anyone have access to the original pictures from this thread? They would be much appreciated.

John

Hi John,

The thumbnails don't show up for me either, but I can see the photos when I click on them.

I've used your site quite a bit for repairs -- thanks for keeping it going all these years!

 

[JohnsJinma]

Well, that was almost too easy!

THX, 2WD is very limiting.