Went to bale the first hay of the season and got about 100 yards along and the power steering quit completely. Belt is on and tight, pump is turning, has fluid in the system. This 900 has the Saginaw style pump. Manhandled it through that bale and unhooked and put my tired M-670 on to keep going. Tried the archives but didn't find much info for trouble shooting. Drove it earlier that day to move it and worked fine. It has been a bit jerky in the past but I blamed old fluid and tired ps pump. Don't have time for much trouble shooting but since there is only the pump and the steering motor it has to be one or the other. Any checks or tests I can try? Haven't tried it since it happened but it didn't show any sign of working again after it happened. Thanks, Bruce.