Gearbox and overdrive

Slideshow

Although when we removed the cover of the gearbox, the content looked quite well preserved, the drive was seized.

The parts were mostly in good condition, but for some not that obvious reasons, the 2nd gear rusted onto the shaft solid. This kind of well localised rust is usualy due to electrolic corrosion potential of the materials.

Whatever caused the problem, it must not be left like that. First we measured the depth of the surface hardening. It turned out to be quite thick, nearly 1 mm.

Then we regrinded the shaft and the gear.

And installed +0.5mm needle rollers.

Cleaning was straight foreward.

Just like checking all shafts for straightness.

Then we replaced all bearings

Each oil seals.

Balls at various positions.

Regrinded the oil sealing  faces.

The overdrive only needed new balls for the valves. Othervise it was in great condition beneath the oil mud.

Now the finished box is waiting for the duty to come.