Jinma 4x4 Hard to Shift

   / Jinma 4x4 Hard to Shift #1  

mitchash

Gold Member
Joined
Mar 24, 2006
Messages
380
Location
Greene, NY
Tractor
Mahindra MAX 28XL, Jinma 254 (Sold)
I was brush cutting last night with my Jinma 254 and needed the four wheel drive in a couple of muddy places and found it very hard to engage the 4x4. I did get 4x4 working finally and then was able to put it in 2wd easy when I didn't need the 4x4 but it didn't want to go in 4x4 again. Is there anything I can do to make it easier to shift in 4x4?
 
   / Jinma 4x4 Hard to Shift #2  
Make sure the tractor is not standing still when you move the lever to engage. Disengaging is pretty straightforward. But you need a little motion to engage.

//greg//
 
   / Jinma 4x4 Hard to Shift #4  
I agree with Affordable, my linkage was gummed up, once sprayed worked fine.
 
   / Jinma 4x4 Hard to Shift #5  
What greg said, you need to be in motion. Dont use the clutch, as it has no effect whatsoever on 4X4... Just hold gentle pressure up on the 4X4 lever while you are in gear and rolling, or stuck with the rear wheels spinning. When the pawls align, it should slip right into 4X...
 
   / Jinma 4x4 Hard to Shift #6  
What greg said, you need to be in motion. Dont use the clutch, as it has no effect whatsoever on 4X4... Just hold gentle pressure up on the 4X4 lever while you are in gear and rolling, or stuck with the rear wheels spinning. When the pawls align, it should slip right into 4X...

:confused: never heard of this before nor did I ever slam my 4X4 into gear this way :confused: Sorry but I have to completely disagree
 
   / Jinma 4x4 Hard to Shift #7  
:confused: never heard of this before nor did I ever slam my 4X4 into gear this way :confused: Sorry but I have to completely disagree

Well I guess you are going to learn something new todayabout jinma tractors... What kind of 4X4 are YOU refering to. My Jinma 284 tractor and every toyota 4X4(any 4X4 that I can recall) I have ever used works this same way, providing the hubs are dialed in, and you are not spinning the rear wheels hard when you shift. Ever heard of "shift on the fly" The toyota transfer case has the advantage of helical cut gears with a beveled leading edges, so they pull in quite easilly from almost any orientation.

The jinma does not. IT uses a pair of 3 toothed pawls to couple in and out of 4X4. Imagine a piece of pie cut into 6 pieces with every other piece removed. This mates with an identical part. Since the parts are not tapered at the front, they must be rolled into alignment.

In the case of the jinma tractor when you work the 4X4 lever you are sliding part number 35 in this diagram. http://johnstractor.homestead.com/files/ClutchHouse.jpg The shaft it slides on is HARD COUPLED down to the front driveshaft via the transfer case gears.

Hard to read in this pic, but I think it is part 42(lower left) is the part that 35 in the above pic mates with. http://johnstractor.homestead.com/files/DriveGear.jpg IF you look carefully, you will note that the part is hard connected to the front end of the shaft that runs straight thru the gearbox and into the drive gear in the rear differential. It is in those driven gears that engine torque gets applied to the system. So both parts are hard coupled to the axles, and no clutch to be found anywhere. just like the transfer case on most any 4X4 vehicle, located at the OUTPUT of the transmission..

That means as long as the wheels are not spinning the 2 parts are turning at nearly the same speed, but not exactly due to differences in all the gears involved as well as tire size. That is why you don't run 4X4 on hard surfaces. In soft earth, these differences are absorbed by wheel slippage. On hard surface the differences are absorbed as aded heat/wear/breakage in the drivetrain...

While rolling ahead, apply gentle upward pressure on the 4X lever, and when the pawls align, it will slip right in. Turning either left or right may speed the process. Occasionally the parts will be in alignment and it will just pull right in, but there is no guarantee of this...
 
   / Jinma 4x4 Hard to Shift #8  
RonMar; I do know there is 4x4 on the fly my UTV has it. Completely different animal. Lets not compare diferent vehicles, lets stick with the jinma tractor, please. I may have misunderstood your 1st post about this. Yes a gentle roll may help to get the 4X4 to engage that I agree with. I saw the spinning back wheel part of your post that's what confused me. I could see someone having the tractor at WOT in high 1st or 2nd and trying to slam the 4 wheel into gear. I will say mine never gave an issue about shifting, once in a blue moon I may have had to roll slightly to take force off of the components to engage. Sorry for misunderstanding your post, I quess I read into more then I should have.

Mitchash: any updates?
 
   / Jinma 4x4 Hard to Shift #9  
I have a jinma284 also and when going into 4wd I do it without the clutch almost at an idle with the front wheels strieght, works every time no grind easy:thumbsup:
 
   / Jinma 4x4 Hard to Shift #10  
RonMar; I do know there is 4x4 on the fly my UTV has it. Completely different animal. Lets not compare diferent vehicles, lets stick with the jinma tractor, please.

No, it really isn't a different animal, it is exactly the same. Every 4X4 I have operated works exactly this same way... You pull them into and out of 4X4 by doing nothing more than moving the lever. Now if you are stuck and violently spinning the rear wheels(not likly on a jinma tractor) and you try and engage 4X4, the rear end is spinning and the front is not, well something is going to go bang as you try and accelerate the non moving drivetrain from a dead stop... Anyone can misuse the tool I guess...

The rear difflock on the Jinma tractor also uses the same 3 toothed pawl as is used by the 4X4. You almost always have to be in motion, or be stuck with one rear wheel turning to get the difflock to engage
 

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