1. Oil viscosity and temperature
· Oil visosit ranging from 15-400mm²/s, temperature range from - 15 to 70 degree are recommendable.
· Always keep hydraulic oil clean; Use the line filter finner than 25 micron in the tank line.

2. Installation
· The no-spring valves should be installed horizontally.
· Finish the mounting surface flat and smooth within roughness of 6.3S and flatness of 0.01mm.