JCB High mobility vehicles

Differential fluid capacity & service interval

JCB High mobility vehicles require differential fluid with a capacity range of 20 to 27 liters. Service intervals occur every 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 3155
  • Front
  • Use: Normal
  • Capacity 20 liter
  • Change 1000 hours/ 12 months
  • Fastrac 3155
  • Rear
  • Use: Normal
  • Capacity 21 liter
  • Change 1000 hours/ 12 months
  • Fastrac 3185
  • Front
  • Use: Normal
  • Capacity 20 liter
  • Change 1000 hours/ 12 months
  • Fastrac 3185
  • Rear
  • Use: Normal
  • Capacity 27 liter
  • Change 1000 hours/ 12 months

Additional Notes

  • The JCB Fastrac 3155 front differential holds 20 liters, while the rear differential holds 21 liters, reflecting the modest size difference between the two axle housings on that model.
  • The Fastrac 3185 rear differential capacity rises to 27 liters, a notable increase compared to the 21-liter rear differential capacity of the Fastrac 3155, indicating a larger rear axle assembly on the 3185.
  • Both the Fastrac 3155 and Fastrac 3185 share an identical 20-liter front differential capacity, meaning the front axle housing dimensions are consistent across the two models.
  • All four differential service intervals are set at 1000 hours or 12 months under normal use conditions, whichever comes first, applying equally to both front and rear positions across the Fastrac 3155 and 3185.
  • The dual-trigger interval structure of 1000 hours or 12 months means a unit with low annual operating hours would still require a fluid change on the calendar-based 12-month threshold under normal use conditions.

Other Systems