JCB Fastrac 125 Series

Differential fluid capacity & service interval

JCB Fastrac 125 Series differential fluid capacity ranges from 11,5 to 21 liters. Service intervals include checks at 250 hours and changes at 1000 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
  • Fastrac 125, -> 636.000 (1991-1997)
  • Front
  • Use: Normal
  • Capacity 11,5 liter
  • Check 250 hours
  • Change 1000 hours/ 12 months
  • Fastrac 125, -> 636.000 (1991-1997)
  • Rear
  • Use: Normal
  • Capacity 21 liter
  • Check 250 hours
  • Change 1000 hours/ 12 months
  • Fastrac 125, 636.001-> (1991-1997)
  • Front
  • Use: Normal
  • Capacity 11,5 liter
  • Check 250 hours
  • Change 1000 hours/ 12 months
  • Fastrac 125, 636.001-> (1991-1997)
  • Rear
  • Use: Normal
  • Capacity 21 liter
  • Check 250 hours
  • Change 1000 hours/ 12 months

Additional Notes

  • The JCB Fastrac 125 Series carries two distinct differential fluid capacities depending on axle position, with the front differential holding 11.5 liters and the rear differential holding 21 liters across all listed serial number ranges.
  • The rear differential capacity of 21 liters is notably larger than the front, reflecting the greater volume typically associated with rear drive axle housings that integrate additional gearing or braking components in agricultural tractor designs.
  • Both the front and rear differential fluid specifications are shared identically across the two serial number ranges covered, specifically units up to serial number 636.000 and units from serial number 636.001 onward, with no variation in capacity or interval between the two groups.
  • A fluid level check interval of 250 hours applies to both the front and rear differentials under normal use conditions, establishing a periodic inspection point well ahead of the full drain-and-fill service.
  • The change interval for differential fluid in both axles is set at 1000 hours or 12 months under normal use conditions, meaning whichever threshold is reached first would govern when a fluid replacement is due.
  • The dual-trigger change interval of 1000 hours or 12 months reflects a time-based limit alongside the hour-based one, accounting for machines that accumulate relatively few operating hours within a calendar year but may still experience fluid degradation over time.

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