Valmet (Komatsu forest) Wheeled harvesters ( -2011)

Differential fluid capacity & service interval

Valmet (Komatsu forest) wheeled harvesters (-2011) use differential fluid with a capacity range of 9 to 32 liters. Service intervals include 500 km checks, 500 hour checks, 1500 hour changes, 1500 hour/12 month changes, and 2000 hour changes. The data covers 13 configurations.

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

TypeSpecifications
  • 901.1, 311191>
  • Front
  • Use: Normal
  • Capacity 9 liter
  • 901.1, 311191>
  • Front, limited slip
  • Use: Normal
  • Capacity 9 liter
  • 901.1, >311191
  • Front
  • Use: Normal
  • Capacity 9 liter
  • Change 1500 hours/ 12 months
  • 901.1, >311191
  • Front, limited slip
  • Use: Normal
  • Capacity 9 liter
  • Change 1500 hours/ 12 months
  • 911.1, 311371>
  • Front
  • Use: Normal
  • Capacity 9 liter
  • 911.1, 311371>
  • Front, limited slip
  • Use: Normal
  • Capacity 9 liter
  • 911.1, >311371
  • Front
  • Use: Normal
  • Capacity 9 liter
  • Change 1500 hours/ 12 months
  • 911.1, >311371
  • Front, limited slip
  • Use: Normal
  • Capacity 9 liter
  • Change 1500 hours/ 12 months
921
  • Use: Normal
  • Capacity 17 liter
  • Change 1500 hours/ 12 months
  • 921
  • Rear
  • Use: Normal
  • Capacity 22 liter
  • Change 1500 hours/ 12 months
  • 931.1
  • Bogie axle
  • Use: Normal
  • Capacity 9 liter
  • Check 500 km
  • Change 2000 hours
  • 931.1
  • Bogie axle
  • Use: Severe
  • Capacity 9 liter
  • Check 500 km
  • Change 2000 hours
  • 931.1
  • Single axle
  • Use: Normal
  • Capacity 32 liter
  • Check 500 hours
  • Change 1500 hours

Additional Notes

  • Across the Valmet (Komatsu Forest) wheeled harvester range, the front differential capacity for the 901.1 and 911.1 models is 9 liters regardless of whether the unit is a standard or limited slip configuration. The identical fill volume between those two differential types means the limited slip clutch pack does not alter the housing's fluid capacity.
  • Serial number boundaries define two distinct specification groups for both the 901.1 and 911.1. Units at or above serial number 311191 (901.1) or 311371 (911.1) carry a defined change interval of 1500 hours or 12 months under normal use conditions, while units below those serial thresholds list only a 9-liter capacity with no change interval recorded in the specifications.
  • The 921 model carries two separate differential entries with notably different capacities. The differential listed without a positional qualifier holds 17 liters, while the rear differential holds 22 liters. Both share the same 1500-hour or 12-month change interval under normal use conditions.
  • The 931.1 bogie axle differential holds 9 liters and carries both a check interval of 500 km and a change interval of 2000 hours. The same capacity and interval values apply under both normal and severe use conditions, meaning the severity classification does not alter the specified service schedule for that axle type.
  • The 931.1 single axle differential holds 32 liters, which is substantially larger than the 9-liter bogie axle figure on the same machine. A housing of that volume is consistent with a full-size drive axle assembly rather than a compact bogie unit. The check interval is set at 500 hours and the change interval at 1500 hours under normal use conditions.
  • The check interval for the 931.1 bogie axle differential is expressed in kilometers rather than hours, which is uncommon relative to the other entries in the specifications. The single axle differential on the same model uses an hour-based check interval instead, reflecting a different monitoring approach for each axle type.

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