Case Wheeled loaders

Transfer case fluid capacity & service interval

Case wheeled loaders utilize transfer case fluid with a capacity range of 1 to 3,7 liters. Service intervals consist of 1000 hours or 12 months and 1000 hours. The data covers 4 configurations.

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

TypeSpecifications
121D, Perkins 704.30 (2002-2005)
  • Use: Normal
  • Capacity 3,7 liter
  • Change 1000 hours/ 12 months
  • Code: (4x4)
21D, Perkins 704.30 (2002-2005)
  • Use: Normal
  • Capacity 3,7 liter
  • Change 1000 hours/ 12 months
  • Code: (4x4)
221D, Perkins 704-30 (2002-2005)
  • Use: Normal
  • Capacity 3,7 liter
  • Change 1000 hours/ 12 months
  • Code: (4x4)
321D, Perkins 704.30 (2002-2005)
  • Use: Normal
  • Capacity 1 liter
  • Change 1000 hours
  • Code: (4x4)

Additional Notes

  • The Case Wheeled loaders 121D, 21D, and 221D, all fitted with the Perkins 704.30 engine and covering model years 2002-2005, share an identical transfer case (transferbox) fluid capacity of 3.7 liters, indicating a consistent drivetrain architecture across those three configurations.
  • The 321D with the Perkins 704.30 engine carries a notably smaller transferbox capacity of 1 liter, a value that stands in contrast to the 3.7-liter figure specified for the other three models in the same year range.
  • A capacity figure in this context represents a service fill volume, meaning the amount of fluid required when draining and refilling the transferbox during a scheduled maintenance event rather than a full overhaul rebuild.
  • The 121D, 21D, and 221D transferbox fluid change interval is set at 1000 hours or 12 months under normal use conditions, meaning whichever threshold is reached first triggers the service requirement.
  • The 321D transferbox fluid change interval is specified at 1000 hours under normal use conditions, without an accompanying calendar-based interval, distinguishing it from the dual time-and-calendar schedule applied to the other three models.
  • The hour-based interval of 1000 hours is a standard measure in construction equipment maintenance, reflecting operational time on the machine rather than distance traveled, which is the conventional metric for on-road vehicles.

Other Systems