I have a MF 165 that I have put three new pumps on and they keep going out. Luckily they have a one year warranty. They only last about 8 months or so with very little use on tractor. I replaced the linkages on the cylinder because they were wore out but didn't seem to help. The cylinder also has a small leak but I always made sure to keep the pump full of universal hydraulic fluid. The steering has play in it. I noticed when turning the steering wheel back and forth through the movement of the free play the cylinder and steering arms move. I posted a video link below to show you what I'm talking about. I'm not sure if that is causing the cylinder to actuate the pump to much causing premature failure. Thanks for any help!
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