McCormick MB series

Power steering fluid capacity & service interval

McCormick MB series power steering fluid capacity is 2,3 liters. Service intervals are 1000 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
MB55, Perkins 1103C-33 (2006-2015)
  • Use: Normal
  • Capacity 2,3 liter
  • Change 1000 hours/ 12 months
MB65, Perkins 1104C-44 (2006-2015)
  • Use: Normal
  • Capacity 2,3 liter
  • Change 1000 hours/ 12 months
MB75, Perkins 1104C-44 (2006-2015)
  • Use: Normal
  • Capacity 2,3 liter
  • Change 1000 hours/ 12 months
MB75B, Perkins 1104A-44 (2006-2015)
  • Use: Normal
  • Capacity 2,3 liter
  • Change 1000 hours/ 12 months
MB85, Perkins 1104C-44 (2006-2015)
  • Use: Normal
  • Capacity 2,3 liter
  • Change 1000 hours/ 12 months
MB85B, Perkins 1104A-44 (2006-2015)
  • Use: Normal
  • Capacity 2,3 liter
  • Change 1000 hours/ 12 months

Additional Notes

  • The McCormick MB series power steering system holds a capacity of 2.3 liters across all six configurations, covering the MB55, MB65, MB75, MB75B, MB85, and MB85B variants. A consistent capacity across the full lineup indicates a shared steering circuit design rather than system sizing tied to engine displacement or model tier.
  • The 2.3-liter figure represents a service fill capacity, meaning the volume of fluid required to properly charge the power steering circuit during a fluid change, not a total system volume that would include residual fluid retained in lines and components during an overhaul.
  • The MB55 pairs with the Perkins 1103C-33, a three-cylinder engine, while the MB65, MB75, MB85, and their B-suffix counterparts all use four-cylinder Perkins engines from the 1104 family. Despite the difference in cylinder count and displacement between the 1103C-33 and the 1104-series engines, the power steering capacity remains identical at 2.3 liters.
  • The MB75 and MB75B share the same horsepower designation but differ in engine variant, with the MB75 using the Perkins 1104C-44 and the MB75B using the Perkins 1104A-44. The same distinction applies to the MB85 and MB85B pairing. Both pairings carry identical 2.3-liter power steering capacities and the same service interval.
  • The Perkins 1104A-44 and 1104C-44 are variants within the same engine family, with the C-series typically representing a more refined or updated emissions-compliant iteration. The A and C designations reflect internal engineering differences rather than changes to the tractor's hydraulic or steering architecture, which accounts for the uniform fluid capacity across both variants.
  • The service interval for power steering fluid across all MB series configurations is set at 1,000 hours or 12 months under normal use conditions, whichever comes first. The dual-trigger format is standard practice in agricultural equipment servicing, where seasonal or calendar-based maintenance applies when operating hours accumulate slowly.
  • A 1,000-hour interval for power steering fluid is relatively long compared to engine oil intervals on similar tractors, reflecting the comparatively stable operating environment of a closed hydraulic steering circuit, which is less exposed to combustion byproducts and thermal cycling than engine lubrication systems.

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