WHEEL SHOVEL HAVING SUSPENSION DEVICE

摘要

PROBLEM TO BE SOLVED: To make suspension performance easily changeable. SOLUTION: A variable throttle is provided in a passage C1 communicating with a bottom chamber 2b and a rod chamber 2c of a suspension hydraulic cylinder 2. Here, a pair of pilot check valves 17A, 17B and a block 1B housing the variable throttle VD are integrally mounted in the suspension hydraulic cylinder 2. An opening area of the variable throttle is changed to change suspension performance particularly damping performance.