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Shandong TY220 bulldozer and turned ineffective fault diagnosis and troubleshooting


Should be into the air cooler can not walk the same phenomenon should occur, but the reality is that the cold machine working properly, so we can conclude that low-pressure oil seals in good condition,[link widoczny dla zalogowanych], while the hot high pressure oil into the air, unable to walk, the reason for the low-voltage With the increase of oil temperature oil hose, hose heat aging become weak; with the larger degree of vacuum, suction hose is deflated, resulting in poor oil to breathe the air, blocked oil duct, the formation of oil inadequate replacement hose after troubleshooting. 3.3 cold, heat is not working I could not walk, and turned to push mine a TY220 Taishan work 6000h, in the work associated with the current difficulties and turned away not working failure. Failure were as follows: put up any gear, the low, medium speed when they can not walk, walking at high speed is not very difficult and turned to spirit. To this end, we used the following checks. After the engine torque converter and hydraulic shift transmission, it was discovered the engine sound and smoke color normal, clean, and no air filter clogging, oil level and oil is normal. Torque converter no abnormal sound, check the transmission filter are clean and free of blockage. No abnormal sound transmission fluid, oil, and oil is normal. These results indicated that there was no torque converter and transmission failure. According to the structure and transmission principle of the ministries conducted a systematic analysis of hydraulic components, the initial recognition of fault may speed control valve. Variable speed control valve is a valve, quick-return valves, pressure reducing valve, speed valve,[link widoczny dla zalogowanych], directional control valve and system safety valve components. Hydraulic oil under the action of the gear pump, power shift transmission through the filter into the control valve is divided into two, all the way through the relief valve of the overflow into the torque converter, the other way through the control valve on each stem leading to the shift clutch hydraulic cylinder in order to achieve speed. The function of each valve as follows: (1) pressure regulators and quick-return valve: to ensure that the hydraulic cylinder in the clutch shift the work pressure of hydraulic oil (normal 2.5MPa) and the clutch torque capacity adjustment, so that the hydraulic clutch shift the hydraulic cylinder to rise slowly, smooth clutch engagement, to ensure that bulldozers are not speed impact,[link widoczny dla zalogowanych], the speed and smooth start. (2) valve: Generate throttling effect, working to meet a gear clutch pressure (1.25MPa) requirements. (3) speed valve: by operating the variable speed joystick connected to different channels, have different work gear. (4) the direction of the valve: the valve stem through the manipulation of the shift lever to change the location, turn forward or reverse clutch, thus changing the direction of travel of bulldozers. (5) safety valve: Turn the direction of movement through the valve stem to achieve bulldozers started. After analysis, fault should pressure regulators and quick-return valves, pressure regulators and quick-return valve if damaged, the system pressure to meet the requirements, can result in shifting the clutch hydraulic cylinder pressure drops, clutch engagement is not tight arising from slipping,[link widoczny dla zalogowanych], resulting in bulldozers can not walk properly. So we will be speed control valve removed from the disintegration of the aircraft was examined and found regulators have a spring break into four, thus proving that analyze and judge is correct. The replacement of the spring, after the test re-loading washing machine, the machine is operating normally, turn also randomly return to normal troubleshooting. Received :2007-12-11'''''''''''''''''''','''''''''''''''''''' ● ''''''''''''''''''''''''''''''' ●'''''',''''''''''' '●''''( on the next page 5O) mainly by using short delay release of the time delay or delay action on the time of access optional. The delay through the circuit breaker on a relatively easy to achieve the full range of motion selectivity, but in the selection of circuit breakers need to note the following: (1) Whether the next level is to choose the type of circuit breaker, or non-selective circuit breaker , on an instantaneous overcurrent circuit breaker setting current general release shall not be less than the outlet end of the next level of the maximum three-phase circuit breaker short-circuit current of 1.1 times (1.1 for the reliability coefficient.) (2) If under a non-selective circuit breaker,[link widoczny dla zalogowanych], a circuit breaker to prevent the next occurrence of the minimum short-circuit current protection circuit, because of the instantaneous sensitivity at this level is not enough, leaving on a short time delay overcurrent release the first movement, loss of selectivity. General should also be made on a short time delay circuit breaker overcurrent release the current setting of not less than an instantaneous over-current release of 1.2 times. (3) If the next level, but also for the selection of circuit breakers, in order to ensure selectivity, the circuit breaker on a short delay action for at least the next level than a short time delay when the circuit breaker with a long 0.1S. References [1] Shao survival. The choice of low voltage air circuit breaker automatically and cooperation. Electrical Technology, 2000. Received :2007-12-27

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