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About Mack&Cheese

  • Rank
    Engine Started

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  • Gender
  • Location
    West Richland, Washingtion
  • Interests
    Mack Trucks

Previous Fields

  • Make
  • Model
    RD688S Dump Truck
  • Year
  1. Thanks everyone for the information. Oil and filter change is Monday (Memorial Day) and transmission & differentials are Thursday. I will post my results. My E7 has two (2) spin-on oil filters, and a centrifugal filter.
  2. Thanks Jim, I will start there first. Appreciate the feedback!
  3. New to BigMackTrucks, and just purchased a '91 RD688S Dump Truck, E7 460HP, Maxitorque 18 speed, all Mack.
  4. On my '91 Mack RD688S the tachometer doesn't move much at all and usually stays in the 1400 RPM range regardless of engine speed. Where should I look first? Thanks!
  5. New Mack owner here, and needing some information on my truck's capacities. Its a '91 RD688S (Dump Truck), E7 460HP, Maxitorque 18-speed, Mack differentials. I am in need of the amount and types of lubricants used on these components. Where can I find a spec sheet on the engine and transmission that shows these capacities? Thanks in advance for the help!