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Kubota kx91-2 excavator keeps stalling.

Hello. My mini excavator keeps stalling from the main boom and track drive. It won't respond very well when steering. Drives well when going downward but struggles on flat and uphill. Only steers sometimes but most often I need to work levers back & foward to get it to turn. I think the original pump has been replaced and the diesel injectors and pump have been repaired. So if anyone has any ideas it would be a big help. Regards Darren.

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Check fluid levels and viscosity of fluid. The valve spools may be also sticking. Remove, clean and replace them as well.

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