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August 15, 2022
How to solve the problems encountered when the high-altitude working car is working
Many users in the high-altitude operation car or street lamp maintenance car after long-term operation, need to maintain according to the operation instructions, but in the final analysis: there will always be a mechanical failure, and then this special auto network Xiaobian to you some tips, to deal with the failure of the operation: Fault 1: The hydraulic system of the hydraulic lift car cannot reach the required working pressure, and the engine throttle cannot go up. Phenomenon: the leg can not be reeled in, the jib can not be raised, and the turntable does not rotate. According to the pressure gauge, the pressure of each mechanism is very low.
1. The opening pressure of the relief valve is too low. ⑵ The oil level of the tank is too low, or the suction pipe is blocked. (3) The pressure line and the return line collude or leak too much, so that a large amount of oil does not work on the flow back to the tank. (4) The oil pump is damaged or leaked too much.
(1) Adjust the opening pressure of the relief valve (2) Add new oil or check the suction pipe. (3) Check the oil circuit, especially all kinds of valve locks, motors and so on to check the oil pump, repair, or replace.
Fault 2: Operation gear failure of folding arm type aerial working car
Fault 4: Throttle control valve is not working at 18m altitude
Reason: (1) The wire rope in the system is stuck (2) spring damage (3) travel due to the loose rope clamp and the lack of lubricating oil Elimination methods: (1) maintenance (2) replacement (3) adjustment of travel; Tighten and lubricate each P position.
Fault 5:20 meters high working car pressure gauge oil does not indicate, or the pressure does not rise.
(1) The liquid level of the tank is too low or the suction pipe is blocked (2) the relief valve adjustment pressure is too low. (3) The oil pump inlet before the pipe edge is not sealed. (5) The oil pump is damaged or the inner side is badly damaged due to the wear and tear of the pressure pipeline or the return pipeline is collusion or the leakage is too large.
(2) Adjust the pressure appropriately according to the regulations. (3) Exclude the unsealed place (5) repair or replace it or repair or replace it.
Fault 6: The noise and vibration of the oil circuit of the vehicle working at an altitude of 14 meters are serious
Reason: (1) There is air in the pipeline (2) element failure pipe side element is not tight (4) reversing too fast (5) oil temperature is too low, insufficient oil for pipeline blockage.
Elimination method: ⑴ The mechanism repeatedly action, eliminate the internal gas, repair the oil pump. (3) Fix or replace the tight pipe clamp (4) slow operation (5) no-load operation heating (6) oil lubrication. Fault 7: The oil temperature of the vehicle working at an altitude of 16 meters is overheating
(1) The internal leakage is too large (2) The pressure is too high (3) The continuous operation time is long, the ambient temperature is high (summer)
(2) Adjust the pressure. (3) Stop the machine and rest for cooling before working.
Fault 8: The movement of the cylinder and motor of the car working at 12 meters high is uneven, and there is a phenomenon of climbing
Reasons: ⑴ There is air load in the hydraulic system is significantly compressed, so that the movement is not uniform. (2) Lack of lubrication between moving friction surfaces. (3) The clearance between the moving parts and non-parts is too small, or the moving working parts are deformed.
Elimination method: 1. Fill the oil tank with enough oil and reciprocate each cylinder at high speed for several times. The second is often lubricated with butter. (3) Check and adjust the appropriate tightness of the clearance between the moving parts.
Fault 9: The supporting leg of the street lamp maintenance vehicle moves slowly, failing to retracting or even not moving
Reason: ⑴ Relief valve failure or pressure is too low. (2) Oil leakage in the cylinder, oil seal damage and reduce the volume efficiency of the cylinder, oil pump displacement is insufficient, reversing valve failure or serious internal leakage. (3) There are foreign bodies or scars between the cone of the slide valve and the contact line of the valve seat in the two-way hydraulic lock. There is air in the cylinder.
Elimination methods: 1. Maintenance, replacement or pressure regulation. The replacement of oil seal, oil pump displacement is insufficient, do not increase the throttle, improve the engine speed, reversing valve failure, light repair, heavy change. (3) Disassemble and clean, heavy replacement, light restudy the reciprocating movement several times, eliminate air. Failure 10:22 meters above the height of the vehicle turntable can not move
(1) The relief valve overflow pressure is too low or complete failure (2) The oil pump or rotary motor (3) pinion and tooth circle meshing is not good (5) worm gear reduction box is ineffective reversing valve failure
(3) Adjust or correct or replace (4) repair or replace according to the provisions of the maintenance or replacement of ⑸.
The above troubleshooting method of high-altitude working car hopes to be useful to users.
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