Pulled the motor out of the RD4 S/N#: 4G7571 on the weekend due to the ring gear no longer being attached to the flywheel!! It appears to have got seized/jammed on a bolt which had dropped out of starter pinion and when we towed it to when it first got home, sheared the three headless set screws off. It appears that the ring gear was cracked for some time. If any one has a spare ring gear they don't mind parting with or we we may have to take a last resort and weld the crack up and weld onto flywheel (any tips on this?) Also is the ring gear the same for all the D4400's??
We bought the RD4 from the original owners at Lake Grace and they purchased it orginally from Wigmores in 1947 installed with a Le Tourneau Tiltdozer S/N#: D4392A4 and Power Control Unit TE S/N#: P52988TE
Will post a picture of its current state in the next few days.