2016 3520R 3pt hitch bouncing

[Branson3520R]

The 3pt hitch started bouncing about a month ago. I replaced the o-rings and backers on the 3pt piston and it still bounces. Any ideas on what else could be causing the problem?

 

[seville009]

No personal knowledge, but there are many threads on this


Here’s one

https://www.tractorbynet.com/forums/century-branson/361051-3-pt-bouncing-bleeding.html

 

[davrow]

What do you mean by 'bouncing'? Do you mean while tractor is running and sitting still it moves up and down?

My (Kioti) shop manual shows how to adjust that out. No idea how to do it on your Branson, though. Do you have access to a Branson shop manual?

 

[ruffdog]

Is the 3pt position control being set for a given height, it then leaks down, valve sends more oil to cylinder to maintain set height, over and over. That would appear to be bouncing. Cylinder or valve leaking?

 

[Branson3520R]

What do you mean by 'bouncing'? Do you mean while tractor is running and sitting still it moves up and down?

My (Kioti) shop manual shows how to adjust that out. No idea how to do it on your Branson, though. Do you have access to a Branson shop manual?

The answer to your question is yes.
I have copy of the service manual but it doesn't have any adjustments to make or much on troubleshooting.

 

[Branson3520R]

It doesn't matter what position the lever is in, it still bleeds down and then jumps back up. I have replaced the o-rings in the cylinder with no change. I am leaning towards the lift control valve leaking, but I am open to any other suggestions.

 

[davrow]

Branson3520R, sounds like it needs what my manual refers to as "sensibility adjustment" (I think that is a typo as they call it sensitivity adjustment in the instructions below). There is an accompanying drawing I can scan if you want me to. Basically on the forward side of the 3pt (under the seat for me) there is a screw with a locknut.

--------------------------------------------------------------------------------------------------
From the manual:

1. Position the rockshaft lifting arms, with a weight applied, so that they reach about half their angular movement range.
In this way the Control valve is positioned in its neutral phase.

2. Loosen nut "A" and turn the embedded hexagonal screw in a counterclockwise direction until the lifting arms start swaying continuously.

3. With a slow movement stop the movement of the arms by rotating screw "B" in a clockwise direction.

4. When the arms remain blocked in their position, which can be controlled by the relevant instrument positioned on the end of the lifting arms, rotate (clockwise) screw "B" for 1/2 - 3/4 of a turn max. Lock the position with the self locking nut "A".

5. In this way the Control Valve is sensitivity adjusted.
--------------------------------------------------------------

Does this sound like it might match what is happening to you?

 

[Branson3520R]

Thanks to everyone for your input!! I think I found the problem this morning!

 

[ruffdog]

Good find....what is it? Is it sealer, rubber from somewhere else in the system, o-ring?

 

[Branson3520R]

It's what's left of one of the two o-rings between the lift control valve and the top plate for the 3pt hitch.

 

[ruffdog]

So, too much pressure for the o-ring to contain, so the pressure shredded it. I wonder if there are better or stronger type seals out there? Was there an instance that overloaded the system with pressure? Just wondering about the WHY....:confused3:

 

[ptsg]

So, too much pressure for the o-ring to contain, so the pressure shredded it. I wonder if there are better or stronger type seals out there? Was there an instance that overloaded the system with pressure? Just wondering about the WHY....:confused3:

Could be moved out of its place during the assembly process. And now, after some time, it finally gave up.

 

[sd455dan]

Could be moved out of its place during the assembly process. And now, after some time, it finally gave up.

Yeah- looks like it shifted during assembly, time for a dab of grease or petroleum jelly to keep the new O rings in place during bolt up


OP How did it work out- Fully functional now?

Nice to have confirmation repairs have been successful