Kubota KX41H mini excavator problem

[BertZegers]

I have a old Kubota KX41H excavator that served me well for years but when I started to use it this morning I did not have hydraulic power on the arm, the left travel track and the auxiliary port. Everything else works fine. Hydraulic oil level is OK. Unfortunately I don't have the work shop manual.
Anyone with some insight?

 

[b7610hsd]

You need to post here Compact Excavators | Heavy Equipment Forums

 

[BertZegers]

You are right, but I didn't find it, sorry.

The arm, the left track motor and the auxiliary quick coupler did't have pressure. They are all fed by the same one of the three pumps. I was thinking either pump not working or a failure in the main relief valve for this circuit. I found a plug on the valve were a poppet sits under. This was the easiest to get at so I opened it and let a little oil leak out and then put the plug back.
Everything works again.

 

[b7610hsd]

You are right, but I didn't find it, sorry.

The arm, the left track motor and the auxiliary quick coupler did't have pressure. They are all fed by the same one of the three pumps. I was thinking either pump not working or a failure in the main relief valve for this circuit. I found a plug on the valve were a poppet sits under. This was the easiest to get at so I opened it and let a little oil leak out and then put the plug back.
Everything works again.

I was not trying to correct you. I was trying to help point you to a very good forum on excavator problems in case you were not aware of it.