bh77 backhoe swing problem

[Manhut]

Hi,it's Tim
My bh77 backhoe won't swing to the left very fast, it's extremely slow. It does swing right no problem.If I operate it for a while it starts working ok. I admit sometimes I did push it myself sideways not running to fit in garage. Did i damage a valve or what could I look for ? Thanks in advance....T

 

[quazz]

I don't think you can hurt it pushing it by hand but I think if you can push it and it moves you may have a problem. I have the same hoe and although I have never tried I doubt I could move it. Someone really smart will be along shortly and tell us what is up.

 

[North Idaho Wolfman]

If you can move the swing by hand or really any other means of pushing, you have a blown cylinder seal.

 

[Tarmy]

If you can move the swing by hand or really any other means of pushing, you have a blown cylinder seal.

I have the same issue...but also have bleed down on another cylinder and weak jerky movement on a couple of other different rams...I was suspecting the main valve block was screwed up...as it has been a problem since day one.

Is there any chance that both swivel cylinders blow at the same time...as both would need to have failed for it to move by hand?

 

[North Idaho Wolfman]

Is there any chance that both swivel cylinders blow at the same time...as both would need to have failed for it to move by hand?

Not necessarily, as they are plumbed in a reverse tandem, so one bleeding off will let the other move.

 

[Manhut]

I've used mine for many years no kind of problems. Yes you can move boom side to side but it takes alot of push and moves slow. but i think i might have done something too it. mine also does that on and off lunging as it moves to the side.

 

[joe87]

Hey Tim did you ever find the cause of your problem, I'm having the same issue but swinging to right.

 

[DavidLott]

Has anyone found a solution for this issue?
Thanks.

 

[dirtydeed]

Try pulling the cover off the BH to expose the control lever linkage. Make sure that the lever connections are not bound. There are three bolts that attach the levers to the rod end joints. If they are not aligned correctly, it can cause the valve to not open up enough to get full flow to the cylinder. Simply stated, check the position of all of the control rod connections to see if any are causing binding when you move the control sticks.

These are the little buggers I'm referring to...

 

[leoric]

Try pulling the cover off the BH to expose the control lever linkage. Make sure that the lever connections are not bound. There are three bolts that attach the levers to the rod end joints. If they are not aligned correctly, it can cause the valve to not open up enough to get full flow to the cylinder. Simply stated, check the position of all of the control rod connections to see if any are causing binding when you move the control sticks.

These are the little buggers I'm referring to...

I came here to comment on this. The nuts that hold the rod links on came loose and I slowly lost movement in my BH since the rod was moving on the bolts. Eventually one fell off and I noticed when I couldn't move my stick! I took a punch and indented the threads so the nut at least wont come off again.

 

[DavidLott]

I've fixed it. As suggested, I took off the covers. All my linkage was fine. On a whim, I adjusted the adjustment screw on the swing control valve ccw about 1&1/2 turns and now it works fine. Mine was not swinging to the right at normal speed.

 

[dexterous]

I've fixed it. As suggested, I took off the covers. All my linkage was fine. On a whim, I adjusted the adjustment screw on the swing control valve ccw about 1&1/2 turns and now it works fine. Mine was not swinging to the right at normal speed.

I have the same problem. Where did you find information on the adjustment screw? My old BT603 backhoe felt very precise but the swing on my new BH77 feels pretty unusual. There’s only 15 hours on my B2650 and most of that is backhoe time.