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An hydraulic lock is incorporated which prevents the operator from extending the bottom lift cylinder to a hazardous configuration whereby the load could runaway.
This lock can also be activated if the bottom lift cylinder is fully retracted and system pressure is allowed to build up to 4000 psi. If the lock is unintentionally activated in this manner, the operator will be required to wait for a short period of time to allow the pressure to dissipate and the lock release.