JCB Fastrac 125 Series

Transfer case fluid capacity & service interval

JCB Fastrac 125 Series requires 3 liters of transfer case fluid. Service intervals include checking at 50 hours and changing at 1000 hours or 12 months. The data covers 2 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 3 liter
  • Check 50 hours
  • Change 1000 hours/ 12 months
  • Fastrac 125, 636.001-> (1991-1997)
  • Front
  • Use: Normal
  • Capacity 3 liter
  • Check 50 hours
  • Change 1000 hours/ 12 months

Additional Notes

  • The JCB Fastrac 125 Series transfer case fluid capacity is 3 liters across both serial number ranges, covering units up to serial number 636.000 and those from 636.001 onward.
  • A 3-liter fill volume is characteristic of a compact transfer case serving a combined transferbox and front power take-off (P.T.O.) assembly, rather than a standalone gearbox, which would typically require a larger fluid volume.
  • The check interval is set at 50 hours under normal use conditions, a relatively short interval that reflects the operational demands placed on a transferbox and P.T.O. unit in agricultural machinery.
  • The fluid change interval is 1000 hours or 12 months, whichever comes first, applying to both serial number ranges under normal use conditions. The dual-trigger format means calendar time can mandate a change even when the hour threshold has not been reached.
  • Both serial number ranges, units up to 636.000 and units from 636.001 onward, share identical capacity and service interval specifications for the front transferbox/P.T.O. system, indicating no revision to fluid service requirements was introduced at that serial number boundary.

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