JCB Fastrac 125 Series

Manual transmission fluid capacity & service interval

JCB Fastrac 125 Series manual transmission fluid capacity ranges from 10 to 38 liters. Service intervals include checking every 10 hours and changing every 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)
  • Use: Normal
  • Capacity 10 liter
  • Check 10 hours
  • Change 1000 hours/ 12 months
  • Code: 36/12
  • Fastrac 125, 636.001-> (1991-1997)
  • Range and PTO gearbox
  • Use: Normal
  • Capacity 38 liter
  • Check 10 hours
  • Change 1000 hours/ 12 months

Additional Notes

  • The JCB Fastrac 125 Series carries two distinct manual transmission fluid capacities depending on serial number range, with the pre-636.001 build requiring 10 liters and the 636.001-onward build requiring 38 liters.
  • The 38-liter capacity on the 636.001-onward Fastrac 125 reflects a combined fill covering the manual transmission, range gearbox, and PTO gearbox as a single shared fluid circuit, rather than separate individual sumps.
  • The pre-636.001 configuration specifies only the transmission itself at 10 liters, indicating a narrower fluid circuit scope compared to the later serial number range.
  • Both serial number ranges share an identical check interval of every 10 hours, which is a very short interval consistent with early operational monitoring during initial service periods or high-load agricultural use.
  • The change interval for both configurations is set at 1000 hours or 12 months under normal use conditions, whichever comes first, meaning calendar time can trigger a fluid change even when the hour threshold has not been reached.
  • The 1000-hour change interval applies specifically under normal use conditions for both the 10-liter and 38-liter configurations across the 1991-1997 production span.

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