Hesston (Fiatagri) 7800

Manual transmission fluid capacity & service interval

Hesston (Fiatagri) 7800 manual transmission fluid capacity is 15 liters. Service intervals include checking every 50 hours and changing every 400 hours or 12 months. The data covers 4 configurations.

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

TypeSpecifications
7820 (1993-2000)
  • Use: Normal
  • Capacity 15 liter
  • Check 50 hours
  • Change 400 hours/ 12 months
7825 (1993-2000)
  • Use: Normal
  • Capacity 15 liter
  • Check 50 hours
  • Change 400 hours/ 12 months
7835 (1993-2000)
  • Use: Normal
  • Capacity 15 liter
  • Check 50 hours
  • Change 400 hours/ 12 months
7840 (1993-2000)
  • Use: Normal
  • Capacity 15 liter
  • Check 50 hours
  • Change 400 hours/ 12 months

Additional Notes

  • The Hesston (Fiatagri) 7800 series manual transmission fluid specifications cover four variants — the 7820, 7825, 7835, and 7840 — all sharing identical transaxle fluid requirements across the 1993-2000 model range.
  • Each variant carries a transaxle fluid capacity of 15 liters, a figure consistent with a combined transmission and axle housing where a single fluid fill serves both functions within one integrated unit.
  • The 15-liter capacity applies to normal use conditions across all four variants, meaning the figure reflects standard operating fill rather than a dry or overhaul refill scenario.
  • A fluid level check interval of 50 hours is specified for all four variants, reflecting the relatively short inspection cycle typical of agricultural equipment operating under continuous load conditions.
  • The fluid change interval is set at 400 hours or 12 months, whichever comes first, applying uniformly to the 7820, 7825, 7835, and 7840 under normal use conditions.
  • The dual-trigger change interval — hours and calendar time — means a unit with low annual operating hours would still require a fluid change at the 12-month mark regardless of accumulated engine hours.
  • No variation in capacity or service intervals exists across the four variants, indicating a shared transaxle design was used throughout the 7800 series during the 1993-2000 production span.

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