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mikecacioppo

Case 646 hydraulic Pump Seal problems is 446 a replacement?

mikecacioppo
16 years ago

I have a Case 646 with a front loader and a backhoe. Last year the pump started to leak past the shaft seal on the pump. I removed the pump and had it repaired at a hydraulic shop. Internal were inspected and found OK. New seal was put in. Exact same issue happened when reinstalled and put under load. Had a new seal put in that was a little more heavy duty. Again same issue. The Hydraulic fluid used is straight 30# and has been used successfully on this unit. Can anyone figure out what's going on. Is there a pressure regulator that I can adjust or check? The hose line appear fine with no blockage. Leakage is under load only. Any help is greatly appreciated.

Will a 446 pump interchange with the 646 pump?

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