My coach is a 2007 Magna, with the 600 ISX Cummins. I recently purchased this motorhome, and the previous owner agreed to pay to install the wet kit. He was very meticulous and had taken very good care of the coach, but was the second owner and had had the coach since 2010. His service records showed that the PTO had been serviced 4000 miles prior.
This is our maiden voyage south from Oregon, and we stopped at Oregon Motorcoach Service outside of Eugene to have a few items attended to. They said that with this particular model, the wet kit was not an option due to tight clearances, but pointed out that the spline had been recently serviced. The hydraulic pump on this coach was not the more common one, but an Eaton. Without looking underneath, the service advisor I was speaking with was also under the impression that this pump drove both the cooling and power steering. Now I am glad that he was wrong.
Tomorrow when I speak with the technician, I will have him explore options for keeping the new spline and pump lubricated. As for why mine failed, I would have to guess that it had not been serviced prior to 34000 miles. When they separate and lubricate/grease the spline, I am wondering if they actually inspect them, or if they merely get a grease gun against the shaft and shoot grease in. Had they actually inspected this unit when it was greased 4000 miles ago, I am sure it would have been discovered that the unit was badly worn.
I will share all the final findings later in the week.