Cat 1R-0778 Hydraulic/Transmission Oil Filter is a 4 × 9 inch cartridge-style element designed for Caterpillar hydraulic and transmission oil circuits. It traps contaminants to protect pumps, valves, and gear trains in Cat equipment that specifies the 1R-0778 part, helping maintain hydraulic efficiency and transmission reliability. Part of Caterpillar’s Advanced Efficiency filtration lineup, this filter emphasizes strong contaminant control while preserving dirt-holding capacity across demanding industrial and construction applications.
