Komatsu Pc200 Excavator Walking Deviation Analysis And Elimination
1. Dirt into the machine side of the parking brake in the balance valve oil line
Walking machine, if the dirt blocking the balancing valve hole, leading to parking brake can not be lifted, resulting walk wandering. Because the machine running, the pressure balance valve oil, if the holes can not enter the balance valve spring chamber to promote balance valve spool movement, the pressure balancing valve on the oil can not pass through the slot into the hydraulic system, leading to parking system Power can not be removed, the result can not rotate the motor running, so there walking deviation. Exclusion method; clean balance valve; disassembly, we should avoid the dirt; regular replacement to meet the requirements of hydraulic oil and filter.
2. Center swivel joint seal damage
Center swivel joints formed by the shell and the mandrel, the upper body shell mounted on the spindle is mounted on the lower body. Mandrel tubing on the open there and an equal number of circular grooves, from the shell to the hydraulic oil tank from the mandrel through the hole on the vertical flow of the motor running, so even if the upper body shell with constant rotation, spindle on The trench also with the shell on the oil port was smooth. So that hydraulic oil can be free to enter, out. If no timely replacement of the hydraulic oil filter, can lead to filter on the bypass valve is opened, hydraulic oil due to oil without the filter directly into the center of the impurity of the sliding surface of rotary joints, damage to the seals, walking by the side of the machine's pressure on both sides of the oil spill caused by the speed of the motor is not running as a result, machines running deviation. Exclusion method: replacement of rotary joint seals; replacing the hydraulic oil and filter.
3. Dirt to plug holes in the final drive of the balancing valve, leading to parking brake force is not relieved
Machine running, if the pressure balancing valve on the oil can not promote the balance valve spool holes to move, then the pressure balancing valve on the oil can not pass through the slot to lift the parking brake force, causing the motor can not walk normal rotation , resulting in excavator deviation. Exclusion method: clean balance valve; disassembly, the need to avoid dirt.
4. Walking motor safety valve leakage
If the safety valve leakage, will cause low pressure within the system, so that the speed of the motor not running, so there walking deviation. Exclusion method: replace the damaged valve motor running; judgments can be left and right running motor safety valve on the exchange, walking to see whether the reverse deflection.
5. Side of the walking machine deflection proportional valve output pressure (pressure control) is too low
This proportional valve can control the stroke length of the operating handle to control the hydraulic output corresponding to the main control valve movement amount corresponding to the speed control device. If you do not get the change oil filter in the filter, can lead to filter blockage, so that the oil filter bypass valve open, dirty hydraulic oil in the case of unfiltered directly into the loop proportional valve, causing the slide valve valve was stuck, unable to control the oil by the side of the rotary machine deflection proportional to turn the main valve flow control valve, leading to walking deviation. Inspection, to check the pressure of walking proportional valve (3.3MPa) is ruled out: clean body and with the former circuit, replacing the hydraulic oil filter.
6. Suction side of the walking machine deflection valve damage
Suction valve device installed in the work of the hydraulic cylinder and motor. Its role is: When the hydraulic cylinder or motor from outside a huge impact, the motor can be relieved or significant impact from outside, the tank may be relieved or abnormally high pressure inside the motor (set pressure is generally in the 36.5Mpa below), which protect the tubing and cylinder from damage. If you walk Suction valve damage, the valve spring soft or broken, then walk inside the main valve will reduce the oil pressure, leading to inadequate drive motor running, walking caused deviation. Exclusion method, the suction valve repair or replacement.
7. Deflection at the side of the walking machine main valve spool movement failure
If you walk inside the main valve spring soft or broken, or the valve was stuck, may lead to reduced oil pressure, appear to walk deviation. Inspection, moving the main valve to measure the pressure oil line, the normal value if the 32.5Mpa. If you walk the main valve damage, to be replaced or repaired. My unit appears twice PC200 excavator walking deviation, are due to damage caused by running the main valve. Therefore, the deviation in the event of a failure to walk, should first consider whether to walk the main valve is damaged, avoid detours.
Komatsu Pc200 Excavator Walking Deviation Analysis And Elimination
By: qoqo
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