Hydraulic pressure resistance and durability with the progress of the times, the development of industries Caterpillar excavator hydraulic cylinders, some of the rapid development of hydraulic machinery industry is one of the following will introduce you to the two natures of hydraulic cylinders.: pressure resistance, durability pressure refers to the maximum pressure in the hydraulic cylinders can withstand a short time, the maximum allowable pressure Pmax or Proof pressure Pt representation, Pt = 1.5 Pn. on military general provisions of Pt = 2 (2 ~ 2.5) Pn. Durability refers to the ability of the hydraulic cylinder can be long-running rated conditions. durability test is under the rated pressure, so that the hydraulic cylinder to be tested in order to design the most demanding speed more than eight hours of continuous operation manual hydraulic cylinders, for speed error is within + 10% of this is a hydraulic cylinder factory inspection and type test items repair process: 1, with oxygen - acetylene flame grilled scratched site (control temperature, avoid surface annealing) self-locking hydraulic. piston cylinder, oil perennial surface alloying baked, grilled to no sparks. 2, will scratch the surface treatment area with angle grinder, grinding depth 1 mm or more, and polished grooves along the rail, preferably dovetail. Drilling deeper scratches ends, change the forces. 3, with cotton wool dipped in acetone or ethanol to clean the surface. Self-locking hydraulic cylinder piston cylinder _ _ Yangquan Lu Lu of hydraulic force provided by the hydraulic machinery plant in Texas. Texas Lu force hydraulic machinery plant (www.luliyeya.com) strong, credible, in Dezhou hydraulic machinery and components industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Lu Hydraulic and you hand into the brilliant, for a better future!