Hydraulic bucket cylinder assembly 4219781 4219780 with piping for the EX400-5 ZX450-3 EX400 excavator Specification Product Name excavator hydraulic arm boom bucket cylinder Part Number 4219781 4219780 9138785 4310244 4390024 4219778 4256047 4310243 4310242 9174340 ARM - stick cylinder The forearm oil cylinder is the core hydraulic actuator of the excavator working device, installed between the boom and the arm, driving the arm (forearm) to swing around the hinge point at
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