Hoist Cylinder Performance - Test
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机器突然移动,会造成人员伤亡。 突然移动车辆或释放油压会伤害车上或附近的人员。 为了防止受伤,测试和调整液压系统前,执行测试和调整, "概述"部分内的程序。 |
- 起动发动机。 使发动机在高怠速下转动。
- 将举倾操纵杆移到升起位置。 卸载车斗完全升起后,将举倾操纵杆固定到升起位置 5 秒钟。 随后,将卸载车斗完全降到卡车机架上。
- 重复步骤 2,直到液压油的温度高于 38°C (100°F)。
举倾油缸的升起时间
- 将卸载车斗降到卡车机架上。
- 使发动机在高怠速下转动。
- 将自卸车斗升到完全升起的位置。 利用秒表测量所需时间。
举倾油缸完全伸出所需最长时间约为 15 秒。
注: 如果接通或断开减噪,举升时间约有 3 秒差异。
油缸沉降
注: 利用空载车斗和高于 38°C (100°F) 的液压油执行此测试。
- 将举倾操纵杆移到升起位置。
- 当举倾油缸的一级伸出 305 mm (12 in) 时,将举倾操纵杆移到保持位置。
- 卸载车斗将推动一级缸盖 6.35 mm (0.25 in),以达到举倾油缸的二级。 利用秒表记录所需时间。
油缸沉降可接受的时间与举倾油缸内液压油的温度有关。 关于可以接受的时间,请参阅表 1。
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可接受的油缸沉降量     | ||
分     | 机油温度     | 油缸沉降     |
7.0     | 38° 到 48°C (100° 到 119°F)     |
6.35 mm (0.25 in)     |
4.1     | 49° 到 64°C (120° 到 149°F)     |
6.35 mm (0.25 in)     |
3.0     | 65 °C (150 °F)     |
6.35 mm (0.25 in)     |
以下情况可使油缸过度沉降:
- 液压油箱和举倾油缸间的管路泄漏
- 控制阀滑阀磨损
- 举倾油缸内的密封磨损
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