Backhoe KB2485 valve end-cap popped

[eco88]

While trying to attach the backhoe in the cold, no indoor garage, the left control arm cylinder popped while trying to extended the bucket. Aluminum housing end cap cracked where 2 allen screws attach it to the main body.
It's located at the bottom of the arm responsible for extending the boom.
So, from top down, arm knob, control cylinders housing, piston, cover. The cover broke and leaked all the fluid out. Rest is fine.
I'll attach a couple of pix.
Anyone know the part number for this?

Have 180hrs on the DK4210SE with this hoe. Probably still under warranty less than 2yrs old but I don't have time to wait and mess with warranty and have it sit for weeks at the dealer if this is a cheap part. I hope it is anyways.
Can't believe that the aluminum housing broke like that.
Thanks

 

[Dave Canfield]

Was there perhaps some ice formed inside? I have the same backhoe. I think they are made by Woods.

 

[Dave Canfield]

Perhaps not... they do look similar but not exact.

 

[Dave Canfield]

Does the valve look like this?
This is from the Woods manual.
Perhaps keep the RPMs low for awhile until things warm up?

 

[oldnslo]

Was the lever for that function more difficult to operate than the other functions?
There should be no pressure in that cover unless something is restricting flow to tank. Restriction in tank could cause excess leakage into that cap or worse crack the valve housing.

I would suggest triple checking that the return or tank line is connected correctly and the quick disconnect is fully connected.

 

[Dave Canfield]

From my owners manual. Looks like an Italian company

 

[oldnslo]

Looking at parts breakdown what are items 2 & 20 also labeled E. I think they are the O-ring and backup washer that seals around the spool. If these look extruded or pushed out that would also point towards restriction in the tank line.

 

[Dave Canfield]

I think you are correct.
So there's a hazard in not entirely connecting the rear remote for the return line?
I will have to be careful of that when I connect my backhoe to my tractor. I've been mostly frustrated by the process of getting everything lined up so the backhoe will slide into the brackets on the tractor. Sometimes the backhoe frame aligns, and sometimes it's a pain.

 

[oldnslo]

Unfortunately a partially connected tank line quick disconnect could cause this problem. Not trying to scare you just provide some insight on what might have caused this problem.

 

[eco88]

Thank you Dave for the pics. Looks like it's part #58. I'll check ebay etc for it.
#57 with the washer kit is too short, think that is from the stabilizers.

I'm almost sure that the lines were frozen. The hoe has been sitting outside in 14f to -25f all winter. I had to attach the lines to raise it so I it could be mounted. I ran the tractor for half hour. Then another 15 mins on 1500 rpms. It seemed to have warmed up. The day was mild about 20f. Then I connected the lines of the backhoe.

None of the controls worked at all. I let it sit another 10 mins. Still nothing. Used a propane torch to heat up the cylinders for a while. Then after half hour the stabilizers started to move about half an inch up and down. I kept playing with the controls up and down. And each time the stabilizers would move half an inch more in either direction.
Probably not good for it but I need the hoe bad for a plumbing trench job.
After 20mins of messing with it and watching the hoses jump in agony, the stabilizers kind of worked. The boom was a similar story. Up down up down, kept pushing the controls the same way, trying to lover the boom so the frame would rise to mount it, and eventually heard a hissing sound and then a pop. And hot oil under pressure started spraying up the controls from inside the hosing. And then gushing.
I put in a gallon of oil today, dipstick is still dry.
Anyways, took the cover off and noticed that part was broken and leaking.
So now no damn backhoe.

I panicked and ended up ordering this yesterday:

Pardon Our Interruption...

Seemed close enough. Half inch longer tough.

I'll look for Dave's part number.
Also the dealer is finally open tomorrow so I'll check with them too.

Moral of the story, tractors and oil hate cold. Can't push them in the cold. Or $hit will crack.