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一台CA25D型压路机在工地上作业时,突然出现不能行走的故障。该机行走系统为全液压、双驱动系统。经检查,该机启动后的补油压力为0.8MPa,系统压力为9.0MPa,均远远低于正常值;从测压点流出的少量液压油呈乳白色黏稠状,表明油液已严重变质。由此,判定主液压泵和驱动马达已损伤。拆检后发现,主液压泵的侧板和配流盘确已严重磨损,致使高压侧和低压侧的油道串通,主泵已内泄严重,故使
A CA25D-type roller on the job site, suddenly appeared unable to walk the fault. The aircraft travel system for hydraulic, dual drive system. After checking, the machine after the start of the charge pressure of 0.8MPa, the system pressure of 9.0MPa, are far below the normal value; a small amount of hydraulic oil from the pressure measurement point was milky viscous, indicating that the oil has been seriously deteriorated. As a result, it is determined that the main hydraulic pump and the drive motor have been damaged. After disassembling, it was found that the side plates of the main hydraulic pump and the valve plate had been severely worn, causing the oil passages on the high pressure side and the low pressure side to collude with each other, and the main pump had been drained seriously so that