Komatsu Forest harvesters

Transfer case fluid capacity & service interval

Komatsu Forest harvesters utilize transfer case fluid with a capacity of 4,5 liters. Service intervals include checking at 300 hours and changing at 1500 hours. The data covers 4 configurations.

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

TypeSpecifications
901 TX.1 (4 WD), Sisu 74 AWI Tier 4i / Stage IIIb (2012- )
  • Use: Normal
  • Capacity 4,5 liter
  • Check 300 hours
  • Change 1500 hours
901 TX.1 (6 WD), Sisu 74 AWI Tier 4i / Stage IIIb (2012- )
  • Use: Normal
  • Capacity 4,5 liter
  • Check 300 hours
  • Change 1500 hours
911.5, Sisu 74 AWI Tier 4i / Stage IIIb (2011- )
  • Use: Normal
  • Capacity 4,5 liter
  • Check 300 hours
  • Change 1500 hours
931.1, Sisu 74 AWI Tier 4i / Stage IIIb (2011- )
  • Use: Normal
  • Capacity 4,5 liter
  • Check 300 hours
  • Change 1500 hours

Additional Notes

  • All four configurations share an identical transfer case (transferbox) fluid capacity of 4.5 liters, which is consistent with a service fill volume rather than a full overhaul or dry-fill figure.
  • The Komatsu 901 TX.1 is available in both 4 WD and 6 WD drivetrain configurations, yet both carry the same 4.5-liter transfer case capacity, indicating the transferbox unit itself is common across the two drivetrain layouts.
  • Transfer case fluid checks are specified at 300-hour intervals under normal use conditions across all four configurations, placing routine inspection well within a typical seasonal operating schedule for forestry equipment.
  • The fluid change interval is set at 1500 hours under normal use conditions for all listed configurations, meaning a single change cycle spans five times the length of the check interval.
  • The 901 TX.1 variants are paired with the Sisu 74 AWI Tier 4i / Stage IIIb engine starting from 2012, while the 911.5 and 931.1 models carry the same engine designation starting from 2011, reflecting a one-year difference in the introduction of the Tier 4i / Stage IIIb specification across the model range.
  • The Tier 4i / Stage IIIb designation refers to emissions certification levels, with Tier 4 Interim being a North American EPA standard and Stage IIIb being the equivalent European regulation, indicating the Sisu 74 AWI engine in all four configurations was certified for both markets.
  • All specifications are listed under normal use conditions, meaning the 300-hour check and 1500-hour change intervals apply to standard operating environments rather than severe-duty cycles such as extreme temperatures or heavily contaminated conditions.

Other Systems