McCormick G-MAX II

Differential fluid capacity & service interval

McCormick G-MAX II differential fluid capacity ranges from 6 to 11 liters. Service intervals include checking at 10 hours and changing at 1000 hours or 12 months. The data covers 4 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
  • G125 MAX II, FPT NEF 6.7 (T3) (2021- )
  • Front
  • Use: Normal
  • Capacity 10 liter
  • Check 10 hours
  • Change 1000 hours/ 12 months
  • Code: (4x4)
  • G135 MAX II, FPT NEF 6.7 (T3) (2021- )
  • Front
  • Use: Normal
  • Capacity 10 liter
  • Check 10 hours
  • Change 1000 hours/ 12 months
  • Code: (4x4)
  • G145 MAX II, FPT NEF 6.7 (T3) (2021- )
  • Front
  • Use: Normal
  • Capacity 11 liter (with central brakes)
  • Capacity 6 liter (with side brakes)
  • Check 10 hours
  • Change 1000 hours/ 12 months
  • Code: (4x4)
  • G165 MAX II, FPT NEF 6.7 (T3) (2021- )
  • Front
  • Use: Normal
  • Capacity 6 liter
  • Check 10 hours
  • Change 1000 hours/ 12 months
  • Code: (4x4)

Additional Notes

  • The McCormick G-MAX II front differential fluid capacity varies across the model range, with the G125 MAX II and G135 MAX II both specifying 10 liters, while the G165 MAX II calls for a smaller 6-liter fill.
  • The G145 MAX II presents the most notable capacity variation within the lineup, specifying 11 liters when equipped with central brakes versus 6 liters when equipped with side brakes, reflecting how brake configuration directly affects the shared fluid volume in the front differential housing.
  • All four models share an identical check interval of 10 hours, a figure consistent with early-operation monitoring practices on heavy agricultural equipment where initial fluid condition verification is critical.
  • The change interval across all configurations is set at 1000 hours or 12 months under normal use conditions, whichever comes first, meaning calendar time can trigger a service requirement even when hour accumulation remains low.
  • All specifications listed apply to normal use conditions, which in agricultural service contexts typically refers to standard field operation as opposed to sustained high-load or extreme-environment duty cycles.
  • The shared FPT NEF 6.7 (T3) engine platform across the G125, G135, G145, and G165 variants does not produce uniform front differential capacities, indicating the drivetrain and brake configuration rather than the engine specification is the primary determinant of fluid volume.

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