﻿1
00:00:00,000 --> 00:00:04,850
The gear case protects the pinion and bull gears from the outside environment.

2
00:00:04,850 --> 00:00:09,850
Additionally, the gear case contains the oil used to lubricate the two gears. 

3
00:00:09,850 --> 00:00:16,350
On AC traction motors, the oil also lubricates the pinion end bearing in the traction motor.

4
00:00:16,350 --> 00:00:24,950
The gear case consists of two halves, a top or upper half and a bottom or lower half, which are bolted together.