Yamaha Outboard Power Trim Noise when lowering

[R23 Kingfisher]

The power trim assembly started making an intermittent knocking noise at the lower end of lowering the ngine. It doesn't always happen but possibly happening more frequently. Kind of a knocking like the shafts may be sticking in the seals??? I watched a video on how to replace and re-lube those seals but not sure that is needed at this time. I'll examine the shafts, make sure they are smooth and add a tad of grease on top of the seals and see what happens. I typicall boat solo so I've only heard the noise from the helm. I'll try using the switch on the motor next time I'm at the boat to get a closer look/listen also.

Anybody experience anything like this?

 

[Submariner]

The power trim assembly started making an intermittent knocking noise at the lower end of lowering the ngine. It doesn't always happen but possibly happening more frequently. Kind of a knocking like the shafts may be sticking in the seals??? I watched a video on how to replace and re-lube those seals but not sure that is needed at this time. I'll examine the shafts, make sure they are smooth and add a tad of grease on top of the seals and see what happens. I typicall boat solo so I've only heard the noise from the helm. I'll try using the switch on the motor next time I'm at the boat to get a closer look/listen also.

Anybody experience anything like this?

Have you tried putting grease on the ends of the pistons, where they meet the motor? It's common for the trim pistons to "stick" to the motor when raising or lowering.