Piston rod process principle, the oil cylinder piston rod discoloration, mainly the following three hydraulic systems have high temperature phenomenon, the piston rod in the high temperature state (especially in the cold season) frequent contact with the low temperature environment (sudden drop in temperature) in the maintenance cycle of the replacement of the non brand excavator special hydraulic oil, this is the present. Generally speaking, the piston rod will change color within a few days after changing the oil product. The reason is that there is a kind of extreme pressure and antiwear additive in the hydraulic oil, the quality and performance of the additive are different from the piston rod in the electroplating process because of the uneven temperature control, which causes the surface of the electroplating surface to crack in the later work. The irregular fine crack can be observed on the piston rod surface by the high magnifying magnifying mirror. Piston rod is usually caused by too high hydraulic oil temperature, and this phenomenon occurs mostly in the front half of the bucket oil cylinder which is widely used.
That part of the soil on the radiator ash, regular cleaning, ensure the cooling effect. The replacement of hydraulic oil in the piston rod of the arm cylinder: use the spare excavator to pull the moving arm of the excavator which is ready for oil change. (at this time the excavator's moving arm has been raised to the highest point), the tubing of the non rod cavity on the 2 piston rods of the left and right cylinders is dismantled, the hydraulic oil is attached to the spare oil barrel, and the environmental protection should be paid attention to. Prevent environmental pollution. Then the tubing, which has been disassembled, is placed in the spare oil barrel, and the engine is started. The hydraulic oil from the multiple valves to the tubing is the old hydraulic oil in the multi-channel valve. The oil exchange personnel pay attention to the change of the oil color. When the new hydraulic oil flows out, the engine will be extinguished immediately. Connect the broken pipeline, untie the rope, start the engine, repeatedly do the lifting and falling action of the boom, until the piston rod of the boom cylinder is filled with oil. Only do this single action. After connecting the disassembled tubing, then starting the engine, the engineering oil cylinder retraced the piston rod of the bucket cylinder several times. After placing the bucket on the vertical ground angle, the engine extinguished the oil to replace the hydraulic oil in the piston rod of the bucket cylinder: remove the tubing of the piston rod without rod cavity of the bucket cylinder and block the seal with oil. Stop the hose outlet of the disassembled multi-channel valve and bucket cylinder piston rod.
The empty oil barrel is used to catch the broken oil port on the piston rod of the small arm oil cylinder. After starting the engine, the piston rod piston rod of the bucket action cylinder is all retracted into the cylinder of the cylinder piston rod), and only this single action can be done. The new hydraulic oil enters the rod cavity of the piston rod of the bucket cylinder, and after the piston rod is retracted, all the hydraulic oil in the rod free chamber of the bucket cylinder piston rod is discharged into the empty oil barrel. The engine is extinguished to connect the broken tubing. The piston rod should look at the fluid replacement of the rotary motor system in the position of the liquid level gauge on the hydraulic tank: remove any one of the 2 tubing of the dismantling multiple valve to the rotary motor. Oil plugging and plugging the outlet of multi way valve and rotary motor. The spare empty barrel is connected to the oil outlet which has been disassembled by the rotary motor, and the engine is started, and the excavator is slowly turned. If turning to a certain direction, the oil pipe on the motor does not go out of oil, then it must turn to another direction until the oil is discharged, which is the correct operation. At the same time, we should pay attention to see the color change of the outgoing oil. When the new hydraulic oil flows out, we should shut down the engine immediately.