Caterpillar Wheeled material handlers

AdBlue (DEF) capacity & service interval

Caterpillar wheeled material handlers utilize AdBlue (DEF) with a capacity range of 20 to 34,5 liters. The data covers 4 configurations.

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

TypeSpecifications
MH3026, KE8 (2022- )
  • Use: Normal
  • Capacity 30 liter
MH3022, KH2 (2021- )
  • Use: Normal
  • Capacity 20 liter
MH3024, KH4 (2021- )
  • Use: Normal
  • Capacity 20 liter
MH3022, FM2 (2014- )
  • Use: Normal
  • Capacity 34,5 liter

Additional Notes

  • The Caterpillar Wheeled Material Handlers covered here span four configurations across the MH3022, MH3024, and MH3026 model lines, all equipped with a selective catalytic reduction (SCR) system that consumes AdBlue (DEF) to reduce nitrogen oxide emissions from diesel exhaust.
  • SCR systems require a dedicated fluid reservoir separate from the engine oil and coolant circuits, and the capacity figures listed here represent the total fill volume of that reservoir rather than a consumption rate or service interval quantity.
  • The MH3022 with FM2 engine prefix, introduced from 2014, carries the largest AdBlue reservoir in the dataset at 34.5 liters, a notably high capacity that reduces the frequency of fluid top-ups during extended machine operation.
  • The MH3022 with KH2 engine prefix, introduced from 2021, carries a 20-liter AdBlue reservoir, which is 14.5 liters smaller than the FM2-engined variant of the same base model, reflecting a meaningful difference in tank sizing between the two engine configurations despite sharing the MH3022 designation.
  • The MH3024 with KH4 engine prefix, also introduced from 2021, shares the same 20-liter AdBlue capacity as the KH2-engined MH3022, indicating a common reservoir specification across at least two of the 2021-introduced configurations.
  • The MH3026 with KE8 engine prefix, introduced from 2022, carries a 30-liter AdBlue reservoir, positioning the largest model in the lineup between the 20-liter KH-series machines and the 34.5-liter FM2-engined MH3022 in terms of fluid capacity.
  • All four configurations carry a normal use condition designation, meaning the stated capacities apply under standard operating conditions rather than severe-duty or first-fill scenarios.

Other Systems