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Message: <blockquote data-quote="longeze" data-source="post: 47201" data-attributes="member: 6252"><p>Thanks for the reply Tazza. I come from an automotive background so the lack of exhaust valve guide seals seemed odd to me. The parts vendor confirmed that this engine doesn't use them. Maybe someone else with a perkins 4.203 could comment? Regarding the gearbox, it is in fact a 2 speed, but that doesn't explain why it's connected to both wheel motors. From looking at the exploded view, there is a splined shaft with a bevel gear on it. The shaft appears to drive the concentrically located hydraulic pump directly. The hydraulic schematic for the machine shows the pump as a two stage pump with one section powering the boom and the other section powering the wheel drive motors. The bevel gear I mentioned engages two other bevel gears at 90 degrees, 1 on either side of the splined shaft bevel gear to drive shafts which are coupled to the wheel drive motors for whatever unknown reason. My guess is that each wheel drive motor has its own internal pump which is driven from this gearbox and that the hydraulic schematics in the manual are incorrect. I have been unable to obtain a correct service manual for the L779, as the ones sold for it appear to be for a L775 which I'm told is different. Any comments or suggestions would as always be appreciated.</p></blockquote><p></p>