657G Wheel Tractor-Scraper Hydraulic System Caterpillar


Operational Checks

Usage:

657G A4G
可用操作检查的方法,寻找系统内的漏损。 还可用操作检查的方法,查找故障的阀、液压和转向泵或铰接缓冲装置泵。

液压系统里的油必须在其工作温度为46 至 52°C (115 至 125°F)。

检查机具系统

把机具油缸伸缩多次。 让机具油缸在两面方向全行程伸缩。

  1. 油缸伸缩时,进行观察。 油缸的动作必须正常平滑。

  1. 倾听液压和转向泵有否噪音。

  1. 机具离开地面时,把各个控制阀移到保持位置。 观察油缸活塞杆有否漂移。 如果在60分钟内油缸的移动量超过19.0 mm (0.75 in),则油缸的漂移量过大。

机具油缸漂移是由于以下部件漏油引起的:

  • 油缸活塞密封

  • 管路安全阀

  • 机具控制阀中的锁止阀

  • 备用油路中的球阀

检查铰接缓冲装置系统

将装载油缸伸出并缩回数次。

  1. 必须平滑、有规则地伸出装载油缸。 必须平滑、有规则地缩回装载油缸。

  1. 倾听铰接缓冲装置泵的噪音。

  1. 使装载油缸全行程伸出并完全缩回。

接通铰接缓冲装置开关。 这将会启用缓冲行驶模式。 装载油缸连杆将会伸出。 连杆伸出将会在大约 1.0 秒内发生。

Caterpillar Information System:

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