Caterpillar Transmissions

Automatic transmission fluid capacity & service interval

Caterpillar Transmissions use automatic transmission fluid with a capacity range of 25 to 49 liters. Service intervals include 20000 km/ 6 months/ 500 hours, 40000 km/ 12 months/ 1000 hours, 120000 km/ 36 months/ 3000 hours, and 240000 km/ 48 months/ 4000 hours. The data covers 6 configurations.

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

TypeSpecifications
CX31 (2012- )
  • Use: Normal (preferred)
  • Capacity 45 liter (Dry fill)
  • Capacity 25 liter (Service fill)
  • Change 240000 km/ 48 months/ 4000 hours
  • Code: Caterpillar CX31 6/1
CX31 (2012- )
  • Use: Normal (alternative)
  • Capacity 45 liter (Dry fill)
  • Capacity 25 liter (Service fill)
  • Change 40000 km/ 12 months/ 1000 hours
  • Code: Caterpillar CX31 6/1
CX31 (2012- )
  • Use: Severe (preferred)
  • Capacity 45 liter (Dry fill)
  • Capacity 25 liter (Service fill)
  • Change 120000 km/ 36 months/ 3000 hours
  • Code: Caterpillar CX31 6/1
CX31 (2012- )
  • Use: Severe (alternative)
  • Capacity 45 liter (Dry fill)
  • Capacity 25 liter (Service fill)
  • Change 20000 km/ 6 months/ 500 hours
  • Code: Caterpillar CX31 6/1
  • CX31 (2012- )
  • With retarder
  • Use: Normal
  • Capacity 49 liter (Dry fill)
  • Capacity 27 liter (Service fill)
  • Change 240000 km/ 48 months/ 4000 hours
  • Code: Caterpillar CX31
  • CX31 (2012- )
  • With retarder
  • Use: Severe
  • Capacity 49 liter (Dry fill)
  • Capacity 27 liter (Service fill)
  • Change 120000 km/ 36 months/ 3000 hours
  • Code: Caterpillar CX31

Additional Notes

  • The Caterpillar CX31 automatic transmission has a dry fill capacity of 45 liters, which represents the total fluid volume required when filling a fully drained or rebuilt unit from empty.
  • The service fill capacity of 25 liters on the CX31 automatic transmission is notably lower than the dry fill, reflecting the volume needed during a routine fluid change when residual fluid remains in the torque converter and passages.
  • When the CX31 is equipped with an integrated retarder, the dry fill capacity rises to 49 liters and the service fill to 27 liters, accounting for the additional fluid volume the retarder circuit holds.
  • Under normal use conditions with a preferred fluid, the CX31 automatic transmission carries a change interval of 240,000 km, 48 months, or 4,000 hours, whichever comes first.
  • Under normal use conditions with an alternative fluid, the CX31 automatic transmission change interval drops sharply to 40,000 km, 12 months, or 1,000 hours, a reduction to one-sixth the distance and one-quarter the operating hours compared to the preferred fluid interval.
  • Under severe use conditions with a preferred fluid, the CX31 automatic transmission change interval is set at 120,000 km, 36 months, or 3,000 hours, exactly half the distance and hours of the normal preferred interval.
  • Under severe use conditions with an alternative fluid, the CX31 automatic transmission change interval is reduced to 20,000 km, 6 months, or 500 hours, the shortest interval across all four use and fluid combinations specified.
  • The CX31 automatic transmission with retarder under normal use conditions shares the same 240,000 km, 48-month, and 4,000-hour change interval as the standard transmission under normal preferred conditions, despite holding 4 additional liters of fluid.
  • Under severe use conditions, the CX31 with retarder is specified at a 120,000 km, 36-month, or 3,000-hour change interval, matching the severe preferred interval of the standard transmission configuration.