1.Adjust pressure valve become lossen,after add pressure and there is no any change, it may because of use valve core too long time and breakage.
2.Hydraulic pump used long time and breakage.
3.Hot weather, oil temperature too high, hydraulic oil too dilute then can't add pressure.
4.Cylinder piston head seal ring wear or ageing lead to oil out and can't add pressure.
5.Electromagnetic valve used too long time, valve core wear,leakage lead to can't add pressure.
6.Oil pressure pipe, oil cylinder welding, piston sealing part have leakage.
7.The oil level of the fuel tank is insufficient and the oil filter is sucked.
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