... : 20t SC Type Construction Hoist 1.The product mainly includes:Guide frame, driving body, drive unit, eletric sysrtem, safety base plate ... , anti-dropping tripper, limit device, upper eletric box, suspension cage, down eletric box, underframe guardrail, cable frum, cable guide ... in time.3.2 Check whether the working of the hoist eletric system is ok, the actuation of each AC contactor and ...