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Kobelco excavator arm retracting and confluence system control frame, when the forearm retracting and confluence operation is performed, the pilot pressure switches the small spool and the forearm ...
Some users sometimes smoke when using the loader, and the color of the smoke is different, there are blue and white. The following are some specific solutions for different situations: If the loade...
The Hitachi excavator parking brake is a wet multi-disc negative structure brake. The negative structure means that the brake is often braked by the spring. Once the pilot pressure oil enters the b...
Hitachi excavator gear pump (HY/ZFS11/16.8L) is used to supply pilot pump oil. The gears on the main pump drive the gear pump at engine speed. The pilot oil pressure is set to 5.2kPa by the pilot p...
The layout of the upper structure of Hitachi excavator The upper structure is composed of the main frame, engine, fuel tank, hydraulic oil pressure components, driver's cab, counterweight and o...
1. Neutral loop When the control lever is in the neutral position, the oil pressure of the main pump is blocked by the main sliding plunger in the control valve, and the oil pressure in the circuit...
1. Rotary parking brake system When the front boom, forearm and other accessories are lifted off the ground and parked on a slope, if oil leaks in the rotating circuit, the upper structure may move...
1. Hitachi excavator main hydraulic circuit The main hydraulic circuit is composed of a suction circuit, an output circuit, an oil return circuit and an oil drain circuit. The hydraulic system has ...
The traveling system is composed of traveling hydraulic motor, two-speed hydraulic motor regulating valve, parking brake, brake valve, traveling reducer (final transmission) and so on. 1. Walking h...
1. Disassembly of the control valve assembly Run the engine at low idle speed, operate the cylinder to the end of its stroke without overflowing the oil circuit, lower the working device to the gro...
