Woods 6500 backhoe issue

[DC64]

Hi All, my backhoe boom and dipper both drop to ground when not actively held up with a control input in 10-20 seconds
Thought two leaking internal cylinders but resisted the urged to buy 2 new seal kits and instead ask for help to properly diagnose this. The bucket and swing seem to work fine. Where do I start? I did buy it with this issue….

Dan

 

[PoTreeBoy]

Hi All, my backhoe boom and dipper both drop to ground when not actively held up with a control input in 10-20 seconds
Thought two leaking internal cylinders but resisted the urged to buy 2 new seal kits and instead ask for help to properly diagnose this. The bucket and swing seem to work fine. Where do I start? I did buy it with this issue….

Dan

Here's a link to a test procedure:

Testing hydraulic cylinder while on equipment

Most here may already know this, but I am posting this for those who do not. I stumbled on this today, something I downloaded a while back apparently. Looks to be a very useful procedure if needed.

www.orangetractortalks.com

 

[TheOldHokie]

Hi All, my backhoe boom and dipper both drop to ground when not actively held up with a control input in 10-20 seconds
Thought two leaking internal cylinders but resisted the urged to buy 2 new seal kits and instead ask for help to properly diagnose this. The bucket and swing seem to work fine. Where do I start? I did buy it with this issue….

Dan

First make sure there are no external oil leaks.

The crowd cylinder can droop (extend) from an internal leak in the cylinder.

If the boom cylinder is drifting down (retracting) the control valve is leaking off.

Dan

 

[DC64]

First make sure there are no external oil leaks.

The crowd cylinder can droop (extend) from an internal leak in the cylinder.

If the boom cylinder is drifting down (retracting) the control valve is leaking off.

Dan

No leaks visible
I tested the dipper cylinder per the above test procedure and it was shooting oil past the piston seal.
i was trying to get the boomcylinder out to unhook the hose but I am having major issues with that. The pin in the boom is seized. It is actually seized inside the cylinder, not the boom bosses. Last thing I tried was a 20 ton press and heat but no go. Next I am going to soak the whole contraption in penetrating oil for a couple of days.
Any other suggestions?
I think I will try to unhook a boom cylinder hose at the valves today to test it so I can order the seal kits.
The boom cylinder is extending when the boom is drifting down on mine.

 

[TheOldHokie]

No leaks visible
I tested the dipper cylinder per the above test procedure and it was shooting oil past the piston seal.
i was trying to get the boomcylinder out to unhook the hose but I am having major issues with that. The pin in the boom is seized. It is actually seized inside the cylinder, not the boom bosses. Last thing I tried was a 20 ton press and heat but no go. Next I am going to soak the whole contraption in penetrating oil for a couple of days.
Any other suggestions?
I think I will try to unhook a boom cylinder hose at the valves today to test it so I can order the seal kits.
The boom cylinder is extending when the boom is drifting down on mine.

Yikes!!! Good luck with that pin. Can you get in there with a sawzall to cut it apart?

Dan

 

[DC64]

Yikes!!! Good luck with that pin. Can you get in there with a sawzall to cut it apart?

Dan

No, it’s in there about 12-14”. Looked but I seem to can only get 12” metal blades…
if the penetrating oil doesn’t work I am looking at drilling it out.

 

[PoTreeBoy]

No, it’s in there about 12-14”. Looked but I seem to can only get 12” metal blades…
if the penetrating oil doesn’t work I am looking at drilling it out.

I'm thinking the pin has a shoulder worn on it and the rod end is locked on that shoulder.

Can you get a pry bar in there and lift the rod end a little? Or figure out a way to rotate the pin 90° or so? Probably going to need a new pin either way.

 

[Donystoy]

Wow! I guess the previous owner missed the grease fitting inside the hole in the frame. Sure glad I grease mine religiously. Good luck getting it out. Lay it on its side and soak it in a good penetrating oil for a week. Worst case you might have to cut sections out of the frame to allow for the use of a torch to heat it up.

 

[TheOldHokie]

No, it’s in there about 12-14”. Looked but I seem to can only get 12” metal blades…
if the penetrating oil doesn’t work I am looking at drilling it out.

Time to buy or visit the rental store. Can never have too many tools.

 

[DC64]

Time to buy or visit the rental store. Can never have too many tools.

View attachment 85899

Got it out! wrapped the boom in plastic and poured 2 gallons of PB blaster in it. Let it soak for a week.
Then put the press on it, cranked it and hit the boom with a hammer to shock it. With aloud bang it moved to release the pressure. After that I was just able to press it out.
what a satisfying feeling!!