4300 rear 3-pt issues

[Fly5150]

I have a new to me 4300 that has an issue with the rear hydraulics. When I adjust the lever for lifting the 3-point, it will not respond until the lever is almost all the way up. Then it will raise up till it hits top, and then the engine bogs, until I slightly lover the lever. It will hold in a position, if I put the lever in just the right location.
In my searching so far it looks like either something in the RockShaft valve assembly, or adjustment issues with the linkage. Or both.
Any good suggestions on parts to just order, and then where to start when I tear into it?

Thanks
Dave

 

[beenthere]

Adjust the feedback arm that lets the valve know the position of the arms and stops them just before they reach the top end of their travel.
Also, look close for a possible linkage that is disconnected.

:welcome: to TBN

I'll search for one or more TBN threads that address this issue.
Here is one..

https://www.tractorbynet.com/forums...ting/321317-jd-4310-rockshaft-adjustment.html

 

[Fly5150]

Thanks you for that link, Looks like I know exactly what I'm tearing into this weekend. I think the hardest part will be the adjustment of the arms to get everything moving smoothly again. Im thinking the tech manual will be a purchase today...

-Dave

 

[beenthere]

Dave
Here is the component location from the tech manual. Item #8 is the feedback arm.
Shout back if you have additional questions..

 

[Fly5150]

so far I found one drift pin that was sheared off. Running to the store this afternoon and will see how it works once I get that fixed. Thanks!

 

[beenthere]

Interesting.. any pics ?

 

[Fly5150]

Had to remove the cotter pin to get the linkage to move so I could one up the holes. Hardest part of the job was getting clearance for the drift to hammer the new pin in!

Fixed the problem, and a slight adjustment on the linkage so it doesn't overload at full lift. All fixed up! thanks for the help!

 

[beenthere]

Great to hear.. I recall having to replace a sheared pin in the PTO control lever.. similar tight location to drive out the old and in the new...

 

[waycoolmarine]

hi neighbor from mchenry il. the reason those pins break is linkage seazes up lube everything with a good penetrating oil and exercise it back and forth you will see it loosens up

 

[ictddt]

I have the same issue, having a hard time getting the shaft to free up and move, any recommendations or tricks, ? I would hate to put it all back and have the pin shear again,