I have a UHO83 digger. When you pull back the lever to lift the main boom it goes up and suddenly stops. When the lever is returned to the neutral position and pulled again the boom moves up again then stops again and so on. One of the track motors does the same. I have more than enough hyd oil in the machine, the slew and dipper arm work fine. The machine has two large hyd pumps. A tech has pulled off one of the pumps took it away and concluded that it was worn but not enough to cause problems. Any ideas Whanau.
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