Ursus Bison

Power steering fluid capacity & service interval

Ursus Bison uses power steering fluid with a capacity range of 4,5 to 10 liters. Service intervals include checking at 100 hours and changing at 800 hours or 12 months. The data covers 6 configurations.

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

TypeSpecifications
  • Bison 105-65 (2WD+4WD) (1984- )
  • System, power steering
  • Use: Normal
  • Capacity 7 liter
  • Check 100 hours
  • Change 800 hours/ 12 months
  • Bison 120-85 (2WD+4WD) (1984- )
  • System, power steering
  • Use: Normal
  • Capacity 10 liter
  • Check 100 hours
  • Change 800 hours/ 12 months
  • Bison 145-100 (2WD+4WD) (1984- )
  • System, power steering
  • Use: Normal
  • Capacity 10 liter
  • Check 100 hours
  • Change 800 hours/ 12 months
  • Bison 160-110 (2WD+4WD) (1984- )
  • System, power steering
  • Use: Normal
  • Capacity 10 liter
  • Check 100 hours
  • Change 800 hours/ 12 months
  • Bison 60-35 2WD (1984- )
  • System, power steering
  • Use: Normal
  • Capacity 4,5 liter
  • Check 100 hours
  • Change 800 hours/ 12 months
  • Bison 85-50 (2WD+4WD) (1984- )
  • System, power steering
  • Use: Normal
  • Capacity 7 liter
  • Check 100 hours
  • Change 800 hours/ 12 months

Additional Notes

  • The Ursus Bison hydraulic system and power steering share a combined fluid circuit, which is why the listed capacities reflect the total volume of an integrated system rather than a standalone steering reservoir.
  • The Bison 60-35 2WD carries the smallest hydraulic and power steering fluid capacity in the range at 4.5 liters, consistent with a lighter, two-wheel-drive-only configuration without the added hydraulic demands of a front axle drive system.
  • The Bison 105-65 and Bison 85-50 both specify a 7-liter capacity, placing them in a mid-range bracket between the smallest and largest configurations in the lineup.
  • The Bison 120-85, Bison 145-100, and Bison 160-110 all share a 10-liter capacity, indicating that despite differences in rated power output, the hydraulic and power steering circuit volume is uniform across these three larger variants, whether in 2WD or 4WD configuration.
  • A fluid level check interval of 100 hours applies uniformly across all six configurations. In agricultural machinery, 100-hour checks are a standard short-cycle inspection point intended to catch fluid loss from leaks or system wear before significant damage occurs.
  • The fluid change interval is set at 800 hours or 12 months, whichever comes first, for all configurations. The dual-trigger format means a tractor used in lower-intensity seasonal work may reach the calendar threshold well before accumulating 800 operating hours.
  • All six configurations are rated under normal use conditions, meaning the 800-hour or 12-month change interval reflects standard operating expectations rather than a reduced interval that would apply under more demanding or dusty field conditions.

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