1 Fault phenomenon The vibration of my unit Baoma 3 Jia 21902 suddenly appeared in the work of the police, and then stopped; Another BMW paw 219,2 vibratory roller because of the battery loss, the failure to walk after the auxiliary start, but no error alarm.

2 FAULT DETECTION AND EXCLUSION PROCEDURE 21 The first example of the fault Because the machine has a fault alarm indicator, it is checked that the alarm is no generator power failure and the generator belt is in good condition, so it is determined that the generator is faulty. In the excitation-only circuit, the self-excited small power transistor and the high-power rectifier diode were broken down, causing the generator to fail to generate electricity. After replacing the three pole tubes, the test was completed and the work was normal.

22 Example Fault reference 0 years old Tunchi, 02 TF 801 Tight brake head 1 relay 808 1 010, 01010304, 05 pole 05 start relay 35 relay 25 fuse S04 parking brake at the beginning H01 Vehicle brake means no light Y47 brake solenoid valve According to the fault analysis, check the brake control solenoid valve 47 no voltage across, according to this judgment for the circuit failure, according to the circuit to check the fuse as follows, found that the fuse 25 blown, replace After the start of the test machine still can not walk, after investigation, 25 was blown again, which shows that there is a short circuit in the brake circuit to turn off the power, according to the circuit with a universal check 1 The resistance between the 2 pin and the ground in the terminal board is 4 We are normal.

After the edge of the blade is disconnected, the resistance between the 2f terminal of the X terminal board and the terminal of the terminal of the terminal and the terminal of the terminal is infinity, indicating that the conductor between the terminal 2 and terminal 1 is in good condition. , No short-circuit occurred with universal detection between the 2 connection post and the grounding resistance of the terminal board is zero, indicating that this circuit is short-circuited from the 1 connection board to disconnect the 61 connection post, measured 6 connection post and ground The resistance between the two is 90. Magic is the normal resistance of the relay 135 coil. At this time, the resistance between the retest 2 connection post and ground is still, and the coil value of the measurement brake solenoid 47 is 4. Magic, which is normal.

Disconnect 2 posts from the 1 connection board, use universal measurement 22 The connection between the post and the connection post is still zero, the resistance between the two contacts will be measured after exchange with two pens. The tube has been punctured, resulting in a short circuit replacement of the 02 pole, restoring the wiring, and starting the test machine, cutting work back to normal.

3 Analysis of Causes of Failure Before analyzing the causes of failures, you should first clarify the working principle of 8 part of your 21902 road roller.

Said to connect the positive battery, the heart connected to the ground, that the generator magnetic field self-excited common output of the small power transistor.

After the engine is started, as the generator speed increases, the output voltage of the generator 1 rises. In the closed state of the emergency brake switch 3,1, the current flows to the output terminal with the emergency brake switch 30 pole, 0 relay The wire is connected to the ground and constitutes a loop. The relay 1 pulls in, so that the 36 wire is connected to the 1 wire, that is, the wire is connected to the positive electrode of the battery. When the roller is in the neutral position, the neutral switch 808 is closed, and the current flow is started. Relay 05 coil + ground circuit. The engine start battery neutral switch 808, 1 forward relay 35 coil ground circuit constitutes the loop relay 135 pulls, makes 1 connection pole of 1 wiring board and 2 connect the column to lead the parking brake switch 3, 4 to close The parking brake is released. At this time, the current flows to say that 1 wiring 25 fuse parking brake Khan off 804 is connected via 1 wiring board 15 and 22 is connected to the phase-braking electromagnetic valve 4 ground to constitute a circuit brake solenoid valve opens, When the parking brake is released, the 808 neutral switch is disconnected when the roller walks in the hall and the current flow through the relay 5 is no current through the solenoid valve 47, the parking brake cannot be released, and the roller stops; The cause of the fault is due to the negligence of the staff, misuse of 24, and the use of the power supply as an auxiliary starting power supply. The power supply of this unit is 12, so that the pole tube 02 is densely penetrated to cause a short circuit, the fuse 25 is blown, and the brake solenoid valve 47 has no current. The parking brake could not be lifted, and the road picker stopped and stored. 1.25 insurance is good! ; Car switch 30 and the wiring is connected to the total 4 brake solenoid valve 4 constitute a loop back 102 loopback, 03 forward relay 35 coil ground circuit loop relay 135 to continue to maintain the pull, this phenomenon is called relay freedom It can be seen that as long as any link in the walking circuit occurs, the machine will not be able to walk. The original fault of the first case is due to the damage of the generator and there is no voltage at the end, so the relay 1 cannot pull in and the brake is now in the circuit of the imported machinery. Widely used pole tube is to use. The characteristics of the forward conduction and reverse blocking of the pole tube make the pole tube to protect the electrical components in Tuen Road. (1) The objective is to control the flow of the Tunliu flow. This simplifies the design of the circuit. Once the pole is broken, the pole is broken. In case of mechanical failure, it is important not to neglect the function of the pole tube during the detection of the defect. At the same time, when the machine needs auxiliary starting of another battery, it is necessary to ascertain whether the voltage is the same, and also to pay attention to the connection sequence of the wires when assisting the start. Damage to electrical components Received Date 200061 0355 Bulldozer walking system failure analysis and exclusion He Shibin, Gao Xiaohong 711016 Intermediate No. 415.5 Document code 6 Article ID 1000 Seven 3320025 7 1 Our 1355 bulldozer corpse walking system failure, resulting in The aircraft has not been well utilized.

Failure phenomenon The machine can still work normally to raise the oil temperature within a period of time after starting. After the above full and no-walking failure analysis, the phenomenon of the machine is analyzed, and it is considered that the main reason that the oil temperature cannot rise after the rise is the system or A certain part of the oil rises in viscosity, and the oil spill is so large that it cannot withstand the pressure of the normal one. Power can not be transmitted, so that the machine can not take away the pressure when the fault detection car can walk the pump 1.7 River, 3, pressure relief valve 0.45 safety valve 0.313, gearbox 1.41; can not walk the pressure when the pump 0.6 pressure regulator valve 0.1 Failure Judgment According to the above data, the reason why 叨 cannot walk is because the system working pressure cannot be established and it is necessary to check and eliminate every possible oil leakage point of the system. Check the running gear and find the end clearance of the traveling pump. All of them are very good. Excluding the possibility of draining the running pump, check the pressure relief valve safety relief valve and find that the valve piston springs of both valves are all in check. Check the torque converter to remove the hydraulic torque converter and find the pump impeller. Check the variable speed control mechanism to remove the control valve, found that the body has a piece of compaction rubber on the walking filter element, remove, install the control valve and then measure the pressure, the pressure is still not established, check the gearbox to remove the gearbox, first use The high-pressure gas was used for the shift test. It was discovered that the piston was leaking badly in the neutral position. The gearbox was disassembled and the piston seal rings of several gears were found to wear out in varying degrees. Speed ​​tank sealing ring, equipped with gearbox, pressure measuring pump 2.2, regulating valve pressure 0.4 殪 overflow pressure 0.7 PCT gearbox pressure 22 river, the fault was ruled out by the analysis of the machine failure Examiner, we know In order to deal with any mechanical failure, we must take a serious and careful approach to the waiter, start from each link, and proceed with a pragmatic style of work to conduct a thorough and detailed analysis of the equipment failure. The right medicine to solve all kinds of mechanical failures in our maintenance work

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