3-Point Hitch LEAKING LIFT ARM ?

[KoonHunter51]

FarmPro (Jinma) 2430 4x4

Have a light leak from where the lift arm attaches
Diagram shows o-ring on both sides of shaft that controls lift
Just wondering if a complete dis-assembly is required to get to the o-ring (If that is cause) ?
I see that o-ring & gasket "Kits" are available for rebuild but lift works great otherwise
Thanks, David

 

[Ricks284]

Did you get a Jinma toolbox with your tractor? There were several o-rings and gaskets included in my toolbox and some of them were for the 3-point mechanism. I just bought the rebuild kit, but I used it for the valves and piston, not the lift arms. So I'm not sure exactly how you'd replace the seals on the lift arms. But I think the lift arms use big rubber gaskets with metal springs inside them - I'm not sure if they also use o-rings, but you might need to replace both.

I had to drain the hyd fluid to get to the piston and it wasn't too hard if you need to go that route (removing the 3-pt top link to get to the inside of the lift arms mechanism).

 

[KoonHunter51]

On this 300 series tractor diagram shows a couple bushings & o-ring on each lift shaft
Just wondering if o-ring is inside or outside of box
Probably remove seat & top for more closer observation
Lift works great, so I was not gonna do a complete dis-assembly
David

 

[Ricks284]

On this 300 series tractor diagram shows a couple bushings & o-ring on each lift shaft
Just wondering if o-ring is inside or outside of box
Probably remove seat & top for more closer observation
Lift works great, so I was not gonna do a complete dis-assembly
David

I'm not sure removing the seat will help much, unfortunately... unless you decide to remove the hyd filter.
Sliding the seat all the way forward will give you pretty good access to the lift arms from the back of the tractor.

I think you're probably going to have to drain the fluid and remove the back cover of the hyd fluid tank in order to replace that o-ring. Even if you could pull the lift arms without removing that cover, the hyd fluid would drain out the lift arm hole. So you'd prolly be better off draining the hyd fluid first anyway. Although I didn't remove the lift arms on my Jinma 284, I spent a lot of time back there looking at the mechanism inside the hyd fluid tank. Pulling that back cover off is pretty easy once you've drained the fluid -- it's just removing six bolts.

 

[KoonHunter51]

As pictured, this Jinma has a top cover on the tank
The diagram in manual does not show the top cover
I have drained & replaced filter & new fluid when I first bought tractor, draining is no problem
Just not wanting to get in to a major rebuild over a small leak (I have about 8/9 gal fluid)
David

 

[zonta223]

Contact Tommy from Affordable Tractors. He is a great guy and is active in these forums. He will be able to point you in the right direction

 

[KoonHunter51]

Yes, zonta223, Tommy has helped me in the past & I have bought parts from Affordable
I guess I'm gonna do more diagnose to see if the O-rings is all I need, or if I need a more complete kit
Thanks, David

 

[Ricks284]

As pictured, this Jinma has a top cover on the tank
The diagram in manual does not show the top cover

Gotcha - yours is definitely different than mine. The manual is pretty accurate for my 2004 model. It looks like they made some improvements on later models - removing the tank cover without draining the fluid would really save time (and fluid) compared to the way I have to do it. Good luck with it - hope it's an easy fix for you.

 

[zonta223]

Yes, zonta223, Tommy has helped me in the past & I have bought parts from Affordable
I guess I'm gonna do more diagnose to see if the O-rings is all I need, or if I need a more complete kit
Thanks, David

Not only does he sell the parts.....He would be willing to tell you how to do the O rings and if its an easy job

 

[Woody65]

It was a pretty simple fix on my JD 4300. I took off the lift arms and removed the bushings and O-rings. Put the new ones in and tighten back up. Took about 15 minutes. In my case, there was a slight leak and after a quick investigation, the bolt holding the lift arm on backed off a bit and the O- ring jumped the bushing. The schematic on yours doesn't look that different than mine.

This is how I found it



Fixed