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diesel locos how do ?
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The F-units and early GPs had one traction motor blower per truck. <br /> <br />Crater compound was a very heavy petroleum grease. It used to come in plastic bags and you threw a couple of bags into the gear case, bag and all. Tollerences on the seals between gear case halves and between the gear case and the axle weren't very reliable, and the lubricant had to be heavy to keep from leaking out. It did seep out slowly and stuck to anything it touched. If anyone remembers walking between the rails of tracks that were overgrown with weeds and coming out with some black stuff all over their shoes and the cuffs of their pant - that was crater. Gear pan seals are so good now that some gear pans are oil filled. <br /> <br />Slipped pinion gears are more common that broken gear teeth. I think the gear manufacturing technology is more adanced that method of applying them. Most pinions are induction hardened, rather than case hardened. They are heated before they are pressed onto the axle so that the interference fit is even tighter when they cool, but the high horsepower units are still spinning pinions. I guess if the motor didn't have to spin in both directions, we could screw the pinion on ;-)
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