HX coupling Bearing question

[bawray]

I purchased a used HX with a frozen drive shaft coupling bearing. I replaced the bearing and ran the ski on a hose to check it out. At first the drive shaft had a vibration at the coupling/carbon seal. I loosened the six 10 mm bolts holding the support joint and revved the motor a few times and the vibration went away. I tightened the six nuts and went for a test ride. The new bearing seems to be fine...but after a minute of riding I stopped to check on the coupling. It is getting hot. Not cherry red hot but hot to the touch.my question is ..is it normal for the coupling to get hot when riding? I am worried that something may still be wrong causing the bearing to heat up and ultimately fail. Also, I don't think the vibration is still there but it's hard to tell when riding.

 

[mikidymac]

The HX is very sensitive to alignment. If it’s off it can cause heat, wear and failure.
What year is your HX? The earlier ones with the splined front shaft are the most failure prone.

 

[bawray]

1995. It does have the splined front shaft. When I bought the HX I was told the motor was locked up. I removed the motor and discovered it was free. However, the coupling bearing was rusted and locked up. I'm just not sure if something was amiss before causing the bearing to fail... And it is still amiss now... Like bent shaft, or pump bearing, or impeller issue, or something else?