Zoomlion Rough terrain cranes, RT

Additional Notes

• The Zoomlion RT100, paired with the Cummins QSC8.3 Tier 3 / EU Stage IIIA engine, carries the largest differential fluid capacity across the RT range at 34 liters per axle, reflecting the greater size and load-bearing demands of a 100-ton class rough terrain crane.
• Front and rear differential capacities are identical within each model. The RT35 holds 20.8 liters per differential, the RT55 and RT60 each hold 23.5 liters, the RT75 holds 24.6 liters, and the RT100 holds 34 liters, showing a clear step-up in fluid volume as crane capacity increases.
• The RT55 and RT60 share the same differential fluid capacity of 23.5 liters per axle despite being distinct models, both equipped with the Cummins QSB6.7 Tier 3 / EU Stage IIIA engine.
• An initial service fluid change is specified at 250 hours across all models and both axles. A break-in interval of this kind is standard practice for gear-driven assemblies, as new components generate fine metallic particles during early operation that require early fluid removal.
• Under normal use conditions, differential fluid checks are scheduled every 3 months across all RT models. A time-based check interval of this frequency is typical for heavy construction equipment operating in variable field conditions where contamination or leakage may not be immediately visible.
• The normal-use fluid change interval is set at 12 months or 1,500 hours, whichever comes first, and applies uniformly to both front and rear differentials on all models in the RT range. The dual-trigger format ensures the interval is not exceeded regardless of whether a machine accumulates hours quickly or sits for extended periods.
• The 1,500-hour normal change interval is six times longer than the 250-hour initial service interval, reflecting the difference between a settling-in period for new gear surfaces and the steady-state wear rate of a fully run-in differential assembly.