This week I learned how to use a hydraulic schematic to "reverse engineer" a system. Tracking a system back through the diagram and service manual greatly helped my understanding of the drawings. I also learned that sometimes you don't end up fixing what you intend to... I pulled a truck in to check the steering because a driver wrote up a clunk in the front end on the DDIR sheet. I had Dan turn the wheel while I watched for something amiss. I happened to glance at the water pump pulley that drives the alternator (Cummins M11) and noticed it vibrating. Shut the truck down and was able to see a shiny spot on the pulley shaft where the movement has been wiping the surface clean. I'll be tearing into that problem tomorrow and the steering clunk is on hold for now. If the bearing on the gear is failing I'll have to tear apart the front gear train to replace it.
Week: 52
Total: 322 hours
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