terms

- step ratio
- spliter %
- counter shaft (single, twin, triple)
- synchronizer, or nonsynchronizer
- reverse indler
- 3,4,5,6... speeds (number of forward

manufacture info

  • Eaton Puller (Roadranger): R T L O C/F - 16 7 18 A - M T/T2
    • R: Roadranger
    • T: twin countershaft
    • L: low inertia means aux drive is float
    • O/X overdrive or extra overdrive
    • convertible: can convert 18 speed to 9 speed by change aux
    • position of shift lever: standard middle, forward pos (F)
    • nominal torque: 16 x 1000 + 50lbft
    • engineering level
      • 8 for international (newer transmission has higher number)
    • long speed range (long torque curve), use less gears
    • short torque curve, use more gears, small step ratio
      • shift within peak engine rpm

eaton puller 18 speed

  • EP additive in oil destroy synchronizer (lining material)
  • brake synchro
    • incorrect shifting
    • driveline vibration
    • incorrect lub
  • multiple counter shaft
    • eliminating radius thrust
    • divide torque
    • used smaller counter shaft
  • can have 2 pto on 2 counter shaft
    • don’t mix pto(s)

shifting

  • 10 speed
    • 5 speed @ low & 5 speed @ high
  • 13 speed: red
    • @ low range, can not have high split
  • 15 speed: blue
  • 18 speed: gray
  • neutral, low range (at low), low split (at back), put air in left hand side: filter regulator (control 60 psi)

  • filter regulator supply to slave valve, supply to control valve
  • slave air valve

  • oil coolers
    • recommended @ 350hp and up
    • required @ 399 hp and up with 1400lbft
  • low split: air both side of shifter
  • high split: send air to splitter, air exhaust 1 side

  • 1997 autoshift eaton
    • 3 pedal systems: clutch-brake-throttle
  • ultra shift
    • 2 pedal systems
      • centrifugal clutch
  • ultra shift plus
    • 2 pedal system
      • electric motor for clutching

service

  • noise vibration-> check all drive line and transmission
  • visual inspection
    • plug swap
    • suspension/mounts (check for shining place, hit u-bolt with hammer, if it tight, it will ting, if its lose, dough noise)
    • oil leaks
    • clutch
      • clutch not disengage causes hard shift
    • transmision don’t vibrate, but can make noise.
    • driveline
  • slipt out
    • underload
    • wear fork
  • jump out
    • no load/coast
  • hard shift
    • external
    • internal
      • twisting mainshaft
      • clutch
      • key
    • detent springs
  • gear clash
    • operators error
    • syncho worn on aux section
  • mix match wear pattern on main shaft gears
  • imbalance driveline can cause synchro broken

  • pitting: overload, lack of lub
  • spalling: overload
  • scoring/galling: plastic deformation, metal metal contact, lub failures
  • burned gears
    • overheat inside (shaft) causing the inside of gear blue by towing or release the clutch and down the hill
    • overheat outside gear: lack of lub

hybrid drives

  • two or more sources propulsion
  • mild hybrids:
    • only on launch
      • hydraulic hybrids - garbage trucks
  • ful hybrids
    • launch
    • run full electric
    • run full i.c.e
    • combination
    • e.g. Prius
  • series
    • engine never directly drives/powers vehicle: haul truck (does not have battery); engine runs generator only
      • engine -> generator -> battery pack -> elec motor
  • parallel