Caterpillar Tracked material handlers

Additional Notes

• The Caterpillar 320C MH cooling system holds 30 liters in the main system and 1.5 liters in the reservoir. The reservoir figure represents the expansion or overflow tank, which accommodates coolant displaced by thermal expansion rather than contributing to the primary circuit volume.
• Across the 320C MH configurations EGA and JPL (2002-2005), cooling system capacities and service intervals are identical, with a 30-liter system fill, a 1.5-liter reservoir, and a change interval of 72 months or 6,000 hours under normal use conditions.
• The 330D MH (C5K/PEL) lists a single combined capacity of 36.5 liters without a separate reservoir figure, contrasting with the 320C MH entries where the reservoir is broken out as a distinct value.
• The 345B MH Series II (APB, 1998-2005) carries the largest reservoir capacity in the 300-series entries at 4.5 liters, paired with a 61-liter system fill. A 61-liter total system volume reflects the larger engine and extended cooling circuit typical of machines in the 45-tonne class.
• The 345B MH Series II (APB) specifies two use conditions for coolant change intervals. Under normal use, the interval extends to 72 months or 6,000 hours. Under the alternative acceptable condition, the interval shortens to 24 months or 3,000 hours, indicating a less thermally stable or lower-grade coolant formulation that degrades more rapidly.
• The 345C MH (D3S/MZR, 2007) shares the same dual-condition interval structure as the 345B MH Series II, with 72 months or 6,000 hours under normal use and 24 months or 3,000 hours under the alternative acceptable condition, applied to a 35.5-liter system capacity.
• The 385C MH (WAW, 2007) holds the largest cooling system volume in the dataset at 101 liters, accompanied by a 4.5-liter reservoir. A system volume of this scale is consistent with large-frame machines where engine displacement and hydraulic heat rejection demands require substantially greater coolant mass.
• The 385C MH (WAW) also carries the alternative acceptable use condition, reducing the change interval from 72 months or 6,000 hours to 24 months or 3,000 hours. Given the 101-liter system volume, the practical cost and labor difference between the two intervals is considerable.
• A 10-hour check interval applies uniformly across all models and configurations listed, regardless of machine size, engine variant, or use condition. At 10 operating hours, a check typically involves inspecting coolant level and condition rather than a full drain-and-fill service.
• The 72-month or 6,000-hour change interval associated with normal use conditions across these models is characteristic of extended-life coolant (ELC) formulations, which use organic acid technology (OAT) inhibitors that resist depletion over longer service periods compared to conventional coolants.