Started to strip down the T72 today.

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Tracks and wheels were taken off. Gearboxes out. Right hand box just required two screws removing, and the new motor went in.

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Left gearbox has a neat little plate which is removed, and the motor comes off. Remove the plate from the motor and fit the new motor to the plate, and refit the plate. This felt tight so the screws were loosened and the motor turned by hand to settle it in place.

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Finally, the turret was taken apart, so I could investigate fitting the gun with a recoil, and an increased elevation travel.
I need to order some more wheel bearing and retrieve my pillar drill.