For Dave Robbo

[PeteB]

Hi Dave,

If your 152 has suffered a bent shaft then it should be possible to push the shaft out of the disc in a big press, and fit a new shaft. Chris at treeworks should be able to give you a price for doing that. But I've no clue what that would be. The whole rotor should then be radially and dynamically balanced (like a car wheel/tyre) then reinstalled using a pair of quality bearings. Whilst it is out, I would take the opportunity it check/change both of the shear bars as well.

 

Someone once asked why these failures happen - well, a wood chipper is in self destruct the minute it starts to work. Forcing a blade through timber is a real, hard impact. These forces are transmitted through the steel to the bearings which may fail, or may leave a "step" in the shaft or, over longer periods cause the shaft to bend (especially if someone has chucked something bad in it previous to your ownership). The last 152 was built in 1999 or Y2K so ten years of abuse ain't bad. I have seen machines which, due to their design, suffer from failures every year!

 

Best regards

 

PeteB