Here is the main gearbox just after I separated it from the
HST, and
the rear diff housing. Nothing inside but one gear, one shaft, and one of
the 4 shifter forks!
2nd photo is the inside of the diff housing. Pinion gear and shaft are
missing, but the damaged ring gear is in there.
3rd photo shows some of the loose broken pieces I found. The circlip
and steel casting fragment were inside the
hyd oil reservoir, also in the
picture. The new steel casting forms a bearing and shaft support
inside the gearbox. Some huge forces shattered the original. Most
interesting was the crushed spring, which came from the
MFWD shifter
detent. I found it at the bottom of the diff housing, behind the largest
axle gear. I think it got crushed between the ring and pinion gears, shattering
their teeth. If so, what caused the spring to come out? Perhaps a
broken shifter fork, as that one is only aluminum, and the operator could
have forced it.