hydraulic adapter drawbacks

Hydraulic adaptors drawbacks:
(1) it is a hydraulic transmission fluid as the working medium, the relative motion between the surface there is inevitably leak, while the liquid but not absolutely incompressible, it would be inappropriate in the case of the transmission ratio demanding use.
(2) hydraulic hose adapters with more energy loss in the course of their work, such as friction loss, leakage losses, it is not appropriate for long-distance transmission.
(3) Hydraulic system sensitive to changes in oil temperature, oil temperature changes affect the stability of the movement. Thus, at low and high temperature conditions, the use of hydraulic drive there are certain difficulties.
(4) In order to reduce leakage, manufacture of high precision hydraulic components and therefore high manufacturing costs of hydraulic components, but also more sensitive to oil pollution.