Schaeff Wheeled excavators

Transfer case fluid capacity & service interval

Schaeff wheeled excavators require transfer case fluid with a capacity range of 1,5 to 1,8 liters. The service interval for fluid replacement is 2000 hours. The data covers 5 configurations.

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

TypeSpecifications
HML22 (1997-2002)
  • Use: Normal
  • Capacity 1,5 liter
  • Change 2000 hours
HML31 (1996-2001)
  • Use: Normal
  • Capacity 1,5 liter
  • Change 2000 hours
HS41M (1996-2002)
  • Use: Normal
  • Capacity 1,8 liter
  • Change 2000 hours
HML21 (1995-1997)
  • Use: Normal
  • Capacity 1,5 liter
  • Change 2000 hours
HML25XA (1995-1997)
  • Use: Normal
  • Capacity 1,5 liter
  • Change 2000 hours

Additional Notes

  • Across the Schaeff wheeled excavator lineup from 1995-2002, transfer case fluid capacity falls into one of two values: 1.5 liters for the majority of models, or 1.8 liters for the HS41M (1996-2002).
  • The 1.5-liter transfer case capacity applies to the HML21, HML22, HML25XA, and HML31, all of which share identical service fill requirements despite spanning different production periods between 1995 and 2002.
  • The HS41M carries a 1.8-liter transfer case capacity, representing the largest transfer case fluid fill volume among the five models listed. The difference of 0.3 liters relative to the other models reflects a physically larger transfer case unit in that machine.
  • All five models share a uniform change interval of 2000 operating hours under normal use conditions. In heavy equipment service, hour-based intervals are used in place of time-based intervals because machine usage intensity varies widely between operators and job sites.
  • The 2000-hour change interval applies specifically to normal use conditions across all listed configurations. Normal use in this context refers to standard operating environments as opposed to severe or extended-duty cycles.
  • The HML21 (1995-1997) and HML25XA (1995-1997) share the same production window and identical transfer case specifications, with both units requiring 1.5 liters at a 2000-hour service interval.
  • The HML22 (1997-2002) succeeded the HML21 in the lineup and retained the same 1.5-liter capacity and 2000-hour change interval, indicating continuity in transfer case specification between the two generations.

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