Hyundai Mini excavators, wheeled, R55W -> R95W

Coolant capacity & service interval

Hyundai mini excavators, wheeled, R55W -> R95W require coolant with a capacity range of 9,5 to 12,1 liters. Service intervals include checks at 10 hours and changes at 1000 hours/12 months or 2000 hours. The data covers 6 configurations.

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

TypeSpecifications
R55W-9A, Yanmar 4TNV98C (2014- )
  • Use: Normal
  • Capacity 9,5 liter
  • Check 10 hours
  • Change 2000 hours
R60W-9S, Yanmar 4TNV94L-PHYBY (2012- )
  • Use: Normal
  • Capacity 9,5 liter
  • Change 1000 hours/ 12 months
R55W-9, Yanmar 4TNV98 (2010- )
  • Use: Normal
  • Capacity 9,5 liter
  • Check 10 hours
  • Change 2000 hours
R55W-7A, Yanmar 4TNV98 (2007-2010)
  • Use: Normal
  • Capacity 10 liter
  • Check 10 hours
  • Change 2000 hours
R55W-7, Yanmar 4TNV98 (2005-2007)
  • Use: Normal
  • Capacity 10 liter
  • Check 10 hours
  • Change 2000 hours
R95W-3, Mitsubishi S4S-DT (2000-2007)
  • Use: Normal
  • Capacity 12,1 liter

Additional Notes

  • Across the R55W series, the Hyundai R55W-7 and R55W-7A both carry a 10-liter cooling system capacity, while the later R55W-9 and R55W-9A models specify 9.5 liters — a reduction of 0.5 liters that reflects a revised cooling circuit in the updated platform.
  • The R55W-9A pairs the 9.5-liter capacity with a Yanmar 4TNV98C engine, distinguishing it from the 4TNV98 used in earlier R55W variants. Both engine codes share the same displacement family but differ in emissions and fuel system configuration.
  • A 10-hour coolant level check interval applies uniformly across the R55W-7, R55W-7A, R55W-9, and R55W-9A under normal use conditions, indicating frequent visual inspection is expected as part of routine daily or weekly operation.
  • The R55W-7, R55W-7A, R55W-9, and R55W-9A all specify a 2000-hour coolant change interval under normal conditions. At typical excavator utilization rates, 2000 hours can represent several years of field operation before a full coolant replacement is due.
  • The R60W-9S departs from the R55W pattern by specifying a change interval of 1000 hours or 12 months, whichever comes first. The dual-trigger format — combining an hour-based and a calendar-based limit — means the coolant is replaced on whichever threshold is reached earlier, regardless of machine utilization.
  • No check interval is listed for the R60W-9S, in contrast to the 10-hour check specified for the R55W variants. The R60W-9S also uses a Yanmar 4TNV94L-PHYBY engine, a turbocharged variant, which may influence cooling system maintenance scheduling.
  • The Hyundai R95W-3, powered by a Mitsubishi S4S-DT engine, carries the largest cooling system capacity in the group at 12.1 liters. The S4S-DT is a four-cylinder turbocharged diesel, and the higher coolant volume is consistent with the greater thermal load of a larger displacement engine in a heavier machine class.
  • Only a capacity figure is recorded for the R95W-3, with no check or change interval specified in the available data. Capacity-only entries are common in service documentation when the figure is needed for refill reference following maintenance or component replacement.

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