Dr.Ben
Elite Veteran
Location: Richmond, VA, USA
| A few things to check/replace:
Mainshaft support bearings. I'll bet you a dollar at least the one in the middle bearing block is bad. A lot of this is determined by how dirty your flying site is and how tidy you keep your model.
The bearings that support the front t/r drive shaft. I always loctited these bearings to the shaft, so I rarely had them go out. If you didn't do so, then you need to check the bearings and the shape of the shaft running in them.
Tail box. Check both bearings that support the output shaft. Then check both t/r hub radial bearings and the thrust races. The thrust races will be devoid of grease after that many flights. If your t/r hub isn't black, replace it with the newest version just for safety's sake. Also check the tail box input shaft. I had one spin in the radial bearings to the point it really wore the shaft. After that, I loctited the shaft to those bearings.
Auto hub. Pull it out, flush it thoroughly, then relube it. It'll be dry when you check the bearing. Factory service interval for relubing is every 50 flights, though few do so. You'll need to dress down the inner ring assembly where the sprague frets the sleeve.
Ben Minor |
HOWEVER, you may consider picking up the Hatori SB19 as well depending on what muffler you have been using.
