Laser Z HP Transmission

[Cutter1]

I have a Laser Z HP with 100 hrs on it. Lately when you go up hills and demand more power the whole unit starts to shake drastically and I have to back off the sticks and start again. They changed the belt on the pumps and the spring and it still does it. Any thoughts?

 

[Cutter1]

I thought that too, but they said that it would of showed signs earlier.