As we all know, the application of hydraulic technology almost covers all technical fields of the national economy, and the number of employees in hydraulic technology including engineering and technical personnel and skilled workers has increased accordingly. In its actual work, many technical and economical hydraulic systems have been designed, and many useful experience in hydraulic system installation, commissioning and trial maintenance have been accumulated. However, there are often problems that the system fails to meet the design requirements or cannot operate normally due to poor design operation or improper parameter adjustment. This chapter will focus on the negative-taboo point of view, expounding some problems that often occur in hydraulic system design and operation; at the same time, through some engineering design and operation adjustment examples, it will analyze the right and wrong so that readers can learn from it. Correct methods and skills for system design and operation adjustment.

1. Contraindications in the formulation of transmission plans

Whether a machine adopts hydraulic transmission, whether all moving parts of the whole machine adopt hydraulic transmission, or some moving parts adopt hydraulic transmission, and the other parts adopt mechanical, electrical or pneumatic transmission. Various transmission schemes must be carried out according to the working requirements of the machine. Comprehensive comparison and demonstration, and a decision is made after correct estimation of the necessity, feasibility and economy of the application of hydraulic transmission.

Economically, hydraulic transmission is used as a universal tool. For those machinery or working mechanisms that have too many demanding conditions, the hydraulic transmission scheme should be carefully considered.