As it hasn't been used for a while I would also look at removing both side frame assembly's to get access to the axles and gears. Depending on when they were last lubricated I would drop some oil on the axles either side of the gear so that it goes into the chassis. It may also need the old grease removing from the gears and new grease applied. The other place it will need oiling is on the armature bearings. These are more tricky to get to when it is all assembled together. I use a modified syringe with a needles end cut off to remove the sharp bit. A small amount placed on the shaft right next to the bearing is suffice. If you don't have a syringe you can use large needle dipped in some oil and transfer it to the shaft.
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