McCormick X7 VT-Drive

Differential fluid capacity & service interval

McCormick X7 VT-Drive differential fluid capacity ranges from 4 to 6 liters. Service intervals include 250 hours and 1000 hours or 12 months. The data covers 17 configurations.

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

TypeSpecifications
  • X7.418 VT-Drive, Stage V (2022- )
  • Front, rigid axle
  • Use: Normal
  • Capacity 6 liter
  • Change 1000 hours/ 12 months
  • X7.418 VT-Drive, Stage V (2022- )
  • Front, with suspension
  • Use: Normal
  • Capacity 4 liter
  • Change 1000 hours/ 12 months
  • X7.618 VT-Drive, Stage V (2022- )
  • Front, rigid axle
  • Use: Normal
  • Capacity 6 liter
  • Change 1000 hours/ 12 months
  • X7.618 VT-Drive, Stage V (2022- )
  • Front, with suspension
  • Use: Normal
  • Capacity 4 liter
  • Change 1000 hours/ 12 months
  • X7.621 VT-Drive, Stage V (2020- )
  • Front
  • Use: Normal
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 1000 hours/ 12 months
  • X7.623 VT-Drive, Stage V (2020- )
  • Front
  • Use: Normal
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 1000 hours/ 12 months
  • X7.624 VT-Drive, Stage V (2020- )
  • Front
  • Use: Normal
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 1000 hours/ 12 months
  • X7.660 VT-Drive, T4i / IIIB (2016-2020)
  • Front
  • Use: Normal
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 1000 hours/ 12 months
  • X7.660 VT-Drive, T4i / IIIB (2016-2020)
  • Front
  • Use: First change only
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 250 hours
  • X7.670 VT-Drive, T4i / IIIB (2016-2020)
  • Front
  • Use: Normal
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 1000 hours/ 12 months
  • X7.670 VT-Drive, T4i / IIIB (2016-2020)
  • Front
  • Use: First change only
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 250 hours
  • X7.440 VT-Drive, T4i / IIIB (2013-2020)
  • Front
  • Use: Normal
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 1000 hours/ 12 months
  • X7.440 VT-Drive, T4i / IIIB (2013-2020)
  • Front
  • Use: Initial service
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 250 hours
  • X7.450 VT-Drive, T4i / IIIB (2013-2020)
  • Front
  • Use: Normal
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 1000 hours/ 12 months
  • X7.450 VT-Drive, T4i / IIIB (2013-2020)
  • Front
  • Use: Initial service
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 250 hours
  • X7.460 VT-Drive, T4i / IIIB (2013-2020)
  • Front
  • Use: Normal
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 1000 hours/ 12 months
  • X7.460 VT-Drive, T4i / IIIB (2013-2020)
  • Front
  • Use: Initial service
  • Capacity 4 liter (Suspended front axle)
  • Capacity 6 liter (Rigid axle)
  • Change 250 hours

Additional Notes

  • The McCormick X7 VT-Drive front differential capacity is directly tied to axle type across all listed configurations. A rigid axle holds 6 liters, while a suspended front axle holds 4 liters. The 2-liter difference reflects the additional housing volume and gear mass associated with a rigid axle assembly compared to a suspension-integrated unit.
  • The Stage V variants — X7.418 and X7.618, both introduced from 2022 — list the rigid axle and suspended axle capacities as separate rows rather than as dual values within a single row. The capacity figures themselves remain consistent with earlier configurations: 6 liters for the rigid axle and 4 liters for the front differential with suspension.
  • All configurations across the full range share the same normal-use change interval of 1000 hours or 12 months, whichever comes first. The dual-trigger format — combining an operating-hour threshold with a calendar limit — accounts for machines that accumulate low hours over a long period, ensuring fluid degradation from time alone does not go unaddressed.
  • The T4i / IIIB variants of the X7.440, X7.450, and X7.460, covering 2013-2020, carry an initial service interval of 250 hours for the front differential. An initial service interval at 250 hours is a break-in flush, intended to remove metallic particles and contaminants generated during the early wear-in period of new gear and bearing surfaces.
  • The X7.660 and X7.670 VT-Drive T4i / IIIB models, spanning 2016-2020, label the early differential service as "first change only" at 250 hours, rather than "initial service" as used for the X7.440, X7.450, and X7.460. Both designations apply to the same 250-hour threshold, but the terminology differs between these model groups within the same emission-tier family.
  • The Stage V models X7.621, X7.623, and X7.624, introduced from 2020, carry no early-change interval in the specifications. Normal-use service at 1000 hours or 12 months is the only listed interval for the front differential on those variants.
  • Capacity values across the X7 VT-Drive range represent service fill quantities — the amount of fluid required when draining and refilling the differential during a scheduled change. Service fill figures are typically lower than full overhaul or assembly fill volumes, as some residual fluid remains in the housing after a drain.
  • The X7.660 and X7.670 entered the lineup in 2016, three years after the X7.440, X7.450, and X7.460 were introduced in 2013. All four model groups within the T4i / IIIB emission tier share the same front differential capacity values and normal-use change interval, despite the staggered introduction dates.

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