3320 hydraulic problems

[lrozmiarek]

I have a 2006 3320 with 480 hours on it. Recently, when I put the 3 point all the way up, it bogs down the engine. It seems as if it doesn't know it's all the way up and keeps trying to lift. I called the dealer and they want to check the rockshaft and take apart the hydraulics to find the problem, but it seems as if it may be something simple. Any help would be appreciated! Thank you

 

[Cocre]

Try adjusting the rockshaft position feedback linkage. It is located at the rear of the tractor on the left side, opposite of the rockshaft control lever up near the seat.

Rockshaft Position Feedback Linkage
Adjustment
Reason:
To ensure that draft arms raise to maximum lift height
without engaging relief valve.
Procedure:
1. Position machine on a level surface and set park brake.
2. Shift transmission to NEUTRAL.
3. Position lift control lever in the full forward (down)
position and provide enough weight on lift arms to allow self
lowering.
4. Start engine.
5. Move lift control lever to full raise position (back).
6. Lift arm should raise fully without engaging the relief
valve. Check that there is 25.4 mm (1 in.) of slack above
the vertical height.
Results:
If specification is not met, lengthen the lift arm position
feedback rod to increase, or shorten to reduce the
maximum height until within specification. The relief valve
should not engage.

 

[lrozmiarek]

Thank you for your suggestion. I did what you described, but to no avail. I then called John Deere who sent a technician out. He removed the seat and found the cotter pin was sheered on the control arm of the rockshaft valve, I thought that was good news. When he tried to open the valve with vice grips, he found that it was siezed! I'm not waiting to find out if they can repair the valve or if it has to be replaced.

Thanks again for your help!