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  1. NDT

    Cat 7155 tranny

    FWIW, I've been driving my 915 for going on 6 years now and I really like the 7155. When you get the hang of it you can get to 70 mph as fast as regular traffic when empty.
  2. NDT

    Cat 7155 tranny

    Quote of the year: "I'm not a military truck nut , but i probably know an M715 more intimately then i do my wife" RRacing will tell you the control manifold on the 7155 is complex beyond belief. How Cat managed to make air pressure do what normally is done by hydraulic pressure is beyond...
  3. NDT

    Cat 7155 tranny

    Put a boost gauge on your 400 Cummins. At around 15 PSI, you are turning out about 350 hp. At 20 is about 400. If your engine is against the governor and not transmitting power, your boost gauge will read almost nothing. The oil is not heating because no energy is being absorbed by it, like...
  4. NDT

    Cat 7155 tranny

    7155 has no converter! It has a clutch pack on the input side and a second clutch pack on the output side and in between are conventional gears. One of the two clutch packs is not getting enough air pressure to hold engagement and is slipping. Before long you will ruin the friction material...
  5. NDT

    Cat 7155 tranny

    There is a thread here on rebuilding the manifold written by RRacing. Search "Cat 7155"
  6. NDT

    Cat 7155 tranny

    The trans won't "freeze up", what starts to happen is gear changes won't happen when you move the lever. Most of the time a shot of oil in the air line will clear this up, that is until the o-rings discussed above are damaged. I have a similar issue with backing up. Try applying the brakes...
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