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Message: <blockquote data-quote="Tazza" data-source="post: 47105" data-attributes="member: 82">The only machines i can comment on are Bobcat ones. I have seen reduction boxes that the drive motors bolt to. Naturally to lower the speed and increase torque. I wonder if your setup is for two speed? You can then travel longer distances faster but you reduce your pushing power.As for the engine, it seems weird to me too. The diesels i have worked on have valve stem seals on inlet and exhaust valves. I can see that the exhaust isn't as big of a deal as inlet though as the inlet always has a vacuum against it that will draw in engine oil. The exhaust will have pressure, essentially pushing the oil back up the valve stem.With that said, i'd still rather have seals on both. It helps prevent enging oil being burnt out the exhaust and possibly carboning the valves and seats up more than usual.</blockquote>