Primary Hydraulics 2010 Volvo EC140CL 3,100hrs

[TVA]

By the looks of it, it is Kawasaki main relief and control valve.
First thing I would try to adjust the main relief, before making a mess spilling, oil.

If it will come to removing it - don’t forget to release in tank pressure.

 

[funwithfuel]

Agree with above. Look at your main relief. Is the paint still in tact, or has it been tampered with?
I would start by turning the main in 3/4 of a turn. See if you make a gain in the travel function. Mark the main prior to adjusting. Use a paint marker or sharpie or something.
It looks like you have all the supporting info.

 

[Ben Witter]

First thing I would recommend is trying it in manual mode and see if anything changes.

 

[just-a-mechanic]

Thanks all!

Ok, I cleaned the main relief, that was exactly the issue I was having. Ok didn’t see any evidence of trash, but that mush have been it.

I’m about 4200/4500 psi now. The excavator is operational.

I think I might still have an issue, I’m not sure.
Do both pumps need to apply pressure when you boom down? Or is only one supposed to?

I noticed when I was in the mud about stuck the machine didn’t seem to have enough force to pull me out of the muck. I checked pressures and only #2 pump was applying pressure when I’m a boom down operation.

does this seem right?

 

[funwithfuel]

Boom down, 1 pump, gravity is already working for you. Possible anti-cavitation fault if you can't raise the machine with boom down. Do you have both pumps with arm in on full stroke? How about boom up?

 

[uffex]

Good day
Often there is confusion when boom down stall happens it can be a result of how the machine is operated, if you can receive full pressure at boom down stall that is all you can hope for.
Kind regards
Uffex

 

[funwithfuel]

Looking back, now that you've straightened out your main relief, it's time to check all functions against specs. Additionally, check functions with a temp gun. So when you curl your bucket in/out , shoot surface temp, hold over relief for 10 seconds or less. See if the barrel or hoses heat up. Heat indicates bypass. Perform the same test on arm and boom, obviously you can only do boom up without digging a big hole. You definitely have one or more piston packing degrading based on what the return filter looked like. If you have a storage drum, I would advise draining the tank so you can pull and inspect the sump strainer. The last thing you want is to starve your pumps of oil.
Really glad to read it was a simple fix.

 

[uffex]

Looking back, now that you've straightened out your main relief, it's time to check all functions against specs. Additionally, check functions with a temp gun. So when you curl your bucket in/out , shoot surface temp, hold over relief for 10 seconds or less. See if the barrel or hoses heat up. Heat indicates bypass. Perform the same test on arm and boom, obviously you can only do boom up without digging a big hole. You definitely have one or more piston packing degrading based on what the return filter looked like. If you have a storage drum, I would advise draining the tank so you can pull and inspect the sump strainer. The last thing you want is to starve your pumps of oil.
Really glad to read it was a simple fix.

Thats first class advice
Regards
Uffex

 

[just-a-mechanic]

Thanks!

That is great advice, and I have already completed the intake strainer part and drained the tank. The intake strainer is clean, maybe replaced?

I’ve changed out about 35 gallons of oil as I plan to do it again sometime soon, as I used fairly cheap AW46 oil.

what does the heat gun indicate, I understand heat is generated when oil is made to work, such as in bypass.
...!

never mind, I answered my own question. If heat is not generated when placed in a bypassed condition, then the pressure relief for that function is already in a bypassed condition. Smart troubleshooting.

 

[uffex]

Good day
A alternative method would be to measure equipment creep, I guess you have that information.
Kind regards
Uffex

 

[TVA]

Just a small reminder - when re adjusting port reliefs, you got to temporarily raise main reliefs pressure higher then intended port relief.