Komatsu Motor graders, scrapers, GD/WS

Differential fluid capacity & service interval

Komatsu motor graders, scrapers, GD/WS use differential fluid with a capacity range of 14,5 to 50 liters. The data covers 6 configurations.

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

TypeSpecifications
  • GD500R-2
  • Rear
  • Use: Normal
  • Capacity 15 liter
  • GD505A-2
  • Rear
  • Use: Normal
  • Capacity 15 liter
  • GD505R-2, 30002 -> 30600
  • Rear
  • Use: Normal
  • Capacity 14,5 liter
  • GD505R-2, 30601->
  • Rear
  • Use: Normal
  • Capacity 15 liter
  • WS23S-1, Cummins KT1150
  • Front
  • Use: Normal
  • Capacity 50 liter
  • WS23S-1, Cummins KT1150
  • Rear
  • Use: Normal
  • Capacity 50 liter

Additional Notes

  • The Komatsu GD500R-2 and GD505A-2 both share a rear differential fluid capacity of 15 liters, placing them in the same service fill range for this system.
  • The GD505R-2 shows a capacity split across serial number ranges: units from serial 30002 to 30600 require 14.5 liters, while units from serial 30601 onward require 15 liters, reflecting a mid-production specification change to the rear differential.
  • A 0.5-liter difference between early and later GD505R-2 units may appear minor, but differential systems are sensitive to overfill and underfill, making the serial number range a critical reference point when servicing rear differential fluid on this model.
  • All GD-series rear differential capacities listed fall within the 14.5 to 15 liter range, which is consistent with the compact-to-mid-size motor grader class where rear differentials are relatively modest in volume compared to heavy construction equipment.
  • The Komatsu WS23S-1 equipped with the Cummins KT1150 engine carries a front differential capacity of 50 liters, a substantially larger volume that reflects the scale and load-bearing demands of a scraper-class machine.
  • The WS23S-1 rear differential also holds 50 liters, matching the front differential exactly. Equal front and rear capacities in a machine of this class indicate symmetrical axle design, where both differentials are engineered to handle comparable torque and load distribution.
  • The 50-liter per differential figure on the WS23S-1 means a full differential fluid service on both axles requires 100 liters total, a significant volume that distinguishes scraper-class servicing from the far smaller requirements of the GD motor grader series.

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