Discontinuous hairpin of excavator elastic arm may be the hairpin of arm regeneration valve, which needs to be checked. Because when the arm is recovered, according to the hydraulic system design, the arm should be regenerated to avoid the impact of high-speed multi-system, so it is designed to regenerate. The inlet and return oil of the arm cylinder are exchanged at the position of the regeneration valve to balance the pressure impact. The same is true for arm hairpins.
If occasionally occurs, consideration should be given to:
Hydraulic oil system failure, abnormal system pressure, insufficient flow output, check whether the pilot secondary pressure announced by the electromagnetic proportional valve of the pump is on the low side;
Solenoid valve line contact is not good, whether the line is broken.
2. If frequent occurrences occur, consideration should be given to:
Valve spool hairpin. The valve core hairpin will affect the opening of the cylinder inlet. If the oil path is not smooth, it will affect the continuity of the action.
Whether Handle Pilot Valve Hairs Card
And the valve core hair card should first consider whether the hydraulic oil is too dirty, if so, it needs to clean or replace the hydraulic oil, cleaning the valve core and oil pipeline. Secondly, the following reasons should be considered:
A The deflection occurs when the fastening screw is installed, which makes the body hole and spool deformed and tortuous.
B Excavator operation, cylinder elastic activity, impurities in the air into the valve core, with the valve body hole with the gap, so that the valve core eccentrically placed in the valve body hole, radial unbalanced force occurs, leading to hydraulic clamping of the valve core;
C valve core is not axially aligned with the hole axis of the valve body, and hydraulic clamping occurs.
D. The clearance between the spool and the valve body hole is too small or too large.
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