Hydraulic coupler (speed) of GST50 currently on the market more application, because of its high speed, the damage rate is very high, and the whole machine balancing requirements factory hydraulic coupler conforms to the standard factory will be able to prescribe certification static balance hydraulic coupling high speed 9 general requirements of hydraulic coupler aluminum single piece, in addition to balance the accident, hydraulic coupler also requires the test the oil system, and ensure no leakage, oil temperature and oil pressure under normal circumstances permit the factory