Farm Pro (Jinma) 2430 Gearbox Problem

[KoonHunter51]

I have a Farm Pro 2430 4x4 That I can't get into 3rd gear
Other gears & clutch work fine
Tractor worked fine last fall, & I graded drive one time this winter
Has set outside for 30+ days in very cold weather -4f was lowest
Started fine yesterday 55 degrees but no 3rd gear,
Shift lever will not go in at all
I have not taken top of gearbox off yet, the only thing I can see is rubber gear boots need replaced
Anyone had this or similar problem & what is next step to diagnose & repair ?
Although for my use, 1st, 2nd, & 4th gears are probably all I need,
I do not want to develop future problems
David

 

[deerseeker001]

Welcome from Wisconsin

 

[Diamondpilot]

If the boots are bad water got in and has caused issues. Not good.

Chris

 

[KoonHunter51]

I just checked the fluid in transmission & no water or rust
Fluid was a little low though, just barely on the dip stick
I might take the top off tomorrow to see if any shift forks or gears are bad
David

 

[Affordable]

I agree, if the shift boots are bad they are letting moisture inside the transmission, the shift rails are right below the shifter.Take the cover off, if its a broken shift fork they are not hard to replace,we also have the replacement shift boots and any other part you may need

Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

 

[KoonHunter51]

I agree, if the shift boots are bad they are letting moisture inside the transmission, the shift rails are right below the shifter.Take the cover off, if its a broken shift fork they are not hard to replace,we also have the replacement shift boots and any other part you may need

Thanks Tommy,
If not raining I'll check it out tomorrow
I hope it's just a fork, everything mechanical worked perfect till now

I also might need a some electrical also
Some of the lights don't work & it looks like someone tried to fix via straight wiring voltage regulator & flashers,
fuse box seems fine
This is 4th China Tractor I've had & the 30 hp is just right for my use

See if I'm in your file
David Webb
Marshall, NC

 

[quicksandfarmer]

On mine the cover comes off super easy, just four bolts. The gasket is above the oil level so reusing it didn't result in any leaks. With the cover off it's pretty self-explanatory, you should be able to see what's keeping it from going into gear.

 

[KoonHunter51]

Well, Cover off today & I think my problem is low, very low, fluid. Nothing seems broke or out of place, I can not get either shifter fork to engage by hand.
Shift tubes do have a little discoloration but not too rusty, I am gonna try to post some pics
If shifter tube, gear, or fork is seized, how to remove ?
I assume that this tractor is combined transmission & rear axle fluid, as I could not find a drain for transmission only.
Is the drain at the center of the rear axle ?
Any input appreciated

David

 

[quicksandfarmer]

My recollection is that the forks are held on the tubes by a pin, if you drive the pin out the fork is free to slide on the tube. Once the fork is free the tube can be slid toward one end enough to remove both tube and fork. I definitely was able to replace a fork without doing any more disassembly than taking off the gearbox cover.

Others can correct me, but I believe removing a gear requires taking the gearbox out, which requires splitting the tractor. That's a whole day job. I would start with taking the tubes and forks out and seeing if you see anything.

 

[erj]

David,
Are you saying that the 3 shift forks in the left picture cannot be moved? They are in an unusual position and when I saw them, I thought you had pushed them there. What gear was the gearshift lever in when you removed the cover?
1st picture is shift forks in neutral. 2nd picture is exploded picture of tranny.

 

[KoonHunter51]

Thanks for all replys,
erj, is top tube/fork in your pic in neutral ?
My box has 4 tubes, the H/L tube is not in pic
In my pic the middle tube is 3rd gear only. I thought I had everything in neutral, but I will double check

There is no breakage anywhere that I can see, so I think that fork/gear is seized
A neighbor that is a bulldozer mechanic is gonna look at it today

? FLUIDS ?
? Does Trans,/Gearbox require 80/90wt oil (19 qts) ?
Local store has "PEAK UNIVERSAL TRACTOR FLUID" on sale but I don't think it's anywhere near 80/90wt
David

 

[Winmac]

When in neutral the three blocks will be in alignment, yours are not, you run the risk of engaging two gears at the same time that will destroy the transmission.
Let the me mechanic fix it.

 

[KoonHunter51]

Thanks Winmac,
The picture with top tube & fork not in line is not my gearbox, that is "erj" gearbox
My gearbox is pictured in prior thread, & they are inline

 

[greg_g]

That (erj) diagram is of the wrong transmission. Here's one that's more representative of the 300 series Jinma.

and the transmission cover

Photos of the problem tranny show clear evidence of long term exposure to wet gear oil. How long have you owned this tractor?

//greg//

 

[KoonHunter51]

Thanks greg_g
Your diagram is my transmission, with exception of different gear location.
My 3rd gear is by itself where reverse is in the schematic you sent
The picture erj posted looks like failure/breakage of the block,groove that shifter end goes in on the upper tube.
I drained gear oil, & it does have a very liittle yellowish tint to it, but there was not but about 3.2 gal fluid in it.
There is a little rusty stain on the tubes, but none on gears or inside wall of box
I did remove the roll pins & moved forks back & forth & all seems fine
I don't think tubes can be removed unless broke apart, as I could not get them to move back enough to remove.

Will flush gearbox with kerosene & put back together
Mechanic 1st thought a gear was stuck or o-ring broke,
now says that shifter end may have not been engaging or something stuck, he says all looks good now
I got this tractor about 6 months ago, this is the 4th Chinese tractor I've had.
1 was junk, 1 was too little, 1 was too big, this 30hp is ideal for my use, I just miss the FEL
Other than a couple lights not working, this one has been perfect
David

 

[erj]

Sorry for confusing the issue. When I saw the 3 tubes in David’s picture, I thought that it was the same transmission as my 284. In my picture, the top tube is the Hi/Lo shifter and is in the Hi position. The middle tube is for 2nd and 3rd gears and the bottom tube is for 1st and Reverse.

 

[KoonHunter51]

Oh boy, I just can't believe all the input & help from you guys
erj, I think this Farm Pro 2430 is same as Jinma 304, & the jump from 200 series to 300 series changed the gearbox.
Did you repair the tube & fork in your tranny ?Just wondering if you were able to get the tube out.

I think the combo of low fluid & moisture is the culprit in my problem
I have found a little rusty spot on a couple gear & shaft, so I'm gonna let it soak in a little WD-40 then flush with kero
Oil is high, but I may do it twice
David

 

[greg_g]

It saves money to use the SAME kerosene for multiple flushes. To do that, put some kind of filtration material between the drain hole and the catch bucket. Window screen will get the big chunks, but cheese cloth is much better. Flush the gear boxes, filter the drainage, reuse.

//greg//

 

[KoonHunter51]

Good news here, Flushed box twice. Air hosed a little, put 19 qts. 80/90 oil in gearbox.
Made new gasket for cover & put back on gearbox. Tranny works GREAT, vey smooth & tight.
Now, l am probably gonna need a little help/input on adjusting clutch.
Thanks for all the help,
David

 

[greg_g]

Before formulating a response, it's important to know up front just what it is that makes you think a clutch adjustment is necessary.

//greg//