The four systems of the tractor meet the needs of the work by producing a certain amount of pressure. When the technical state of each system deteriorates, its pressure also changes. Therefore, the pressure changes of each system can be measured with a pressure gauge to accurately understand the internal state. "Tractor four series does not disassemble the tester" is made on the basis of this principle.
The compression system does not perform disassembly inspection, but mainly measures the cylinder pressure at the end of compression. Remove the nozzle of the tested cylinder, install the gas probe and 0 kg of 60 kg cylinder pressure gauge. With the starter belt to turn the engine, the maximum value of the pressure gauge is the pressure value at the end of compression. If the compressibility of the compression system deteriorates, the pressure at the end of compression will also decrease. Therefore, comparing the measured value with the standard value, you can accurately understand the internal conditions. The non-demolition inspection of the fuel system is mainly to measure the tightness of the three precision parts of the plunger pair, the outlet valve and the injector. The tightness of the plunger pair has a direct influence on the operation of the fuel injection pump. When the tightness of the plunger pair deteriorates, the oil supply pressure decreases. Therefore, measuring the pressure of the plunger supply is the main basis for checking its tightness. During the measurement, 0 kg of 600 kg three-way pressure gauge oil inlet connector is connected to the oil pump, and the three-way side connector is sealed with a screw cap. Put the throttle at the maximum fuel supply position, and use the starter belt to turn the crankshaft. If the oil supply pressure exceeds 250 kg/cm2, it indicates that the plunger pair has good tightness. Check the tightness of the oil valve cone surface after checking the tightness of the plunger pair.
When the reading of the pressure gauge pointer exceeds 200 kg/cm2, immediately stop the oil and observe that the pressure gauge pointer is reduced from 200 kg/cm2 to 180 kg/cm2. The normal time should be greater than 15 seconds. When the plunger pair seals well, the 0 kg 600 kg three-way pressure gauge and the oil pump constitute a simple injector tester. The fuel injector to be inspected is connected to the side of the three-way meter and the injection pressure test can be performed. Practice has proved that engine failures (such as difficulty in starting, power drop, smoking and rough work, etc.) are mostly caused by improper operation of compression and fuel systems. Therefore, the 60 kg cylinder pressure gauge and the 600 kg three-way pressure gauge are often used in combination to determine the fault.
The disassembly inspection of the lubrication system is mainly to measure the oil supply capacity of the oil pump and the opening pressure of each valve, so as to accurately judge and eliminate the failure of low oil pressure and high oil temperature. When checking, use 0 kg 10 kg pressure gauge and some special valves and joints. The hydraulic system is not dismantled and checked, mainly to determine the oil supply capacity of the pump, the opening pressure of each valve in the distributor and the tightness of the oil cylinder. In order to accurately determine, rule out the farm tool can not upgrade and promote slow failure. Use a 0 kg 600 kg pressure gauge and special valves and fittings when checking. This type of instrument can measure not only the split hydraulic system but also the half-displacement hydraulic system.
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