770 and 772 Off-Highway Truck Suspension Cylinder Caterpillar


Rear Suspension (Cylinder)

Usage:

770 BZZ

------ WARNING! ------

悬架油缸突然移动可造成人员伤亡。

突然上下移动可导致您头部上方的间隙快速变化。

维修前,务必阅读悬架油缸上的所有警告标签。 在氮气压力完全消失前,不要检查悬架油缸内的油。

除非连杆完全收回且氮气压力完全释放,否则任何情况下都不要拆下油缸上的阀门、盖或螺塞。

测试或调整悬架油缸时,不要站在机器下面。





图 1g01341263



图 2g01341262



图 3g01342950

排气完成后悬架油缸的充压尺寸

充油 ... 25.4 mm (1.00 in)
充满油和氮气 ... 134 ± 6 mm (5.25 ± 0.25 in)

注: 利用 FT1680 表垫块 获得充满油和氮气的尺寸。 关于充压程序,请参阅测试和调整, "悬架油缸(后)- 排气和充压"。

(1) 在销上涂抹一层 5C-5593 防咬合剂 后再与轴承一起组装。

销的外径(四个位置) ... 57.061 ± 0.025 mm (2.2465 ± 0.0010 in)
轴承的内径(四个位置) ... 57.150 + 0 - 0.025 mm (2.2500 + 0 - 0.0010 in)

(2) 充油阀组件

阀门的安装扭矩 ... 14 ± 1 N·m (10.3 ± 0.7 lb ft)
阀门的关闭扭矩 ... 7 ± 1 N·m (62 ± 9 lb in)
阀盖的扭矩 ... 2.5 ± 0.5 N·m (22 ± 4 lb in)

(3) 安装轴承,使分隔线(裂缝面)与图示标记对准。 图示标记为轴承的水平中心线。

(4) 连杆组件的外径(两道棱上) ... 213.87 ± 0.13 mm (8.420 ± 0.005 in)

(5) 油缸组件的内径(两道棱上) ... 215.90 + 0.13 - 0.05 mm (8.500 + 0.005 - 0.002 in)

(6) 缸盖的内径(两道棱上) ... 177.88 ± 0.03 mm (7.003 ± 0.001 in)

(7) 使用润滑剂稍稍润滑要密封的密封唇。

(8) 连杆组件的外径 ... 177.749 ± 0.050 mm (6.9980 ± 0.0020 in)

(9) 阀芯

阀芯的扭矩 ... 0.5 ± 0.1 N·m (4.4 ± 0.9 lb in)

注: 需要在油缸内充入大约 11.2 L (2.96 US gal) 当前使用级别的 SAE 10W 油。

悬架油缸的充压介质为干燥氮气。

内部容积 ... 67 L (4090 in3)

充入压力 ... 100 kPa (14.5 psi)

工作压力 ... 750 kPa (110 psi)

破裂压力 ... 6100 kPa (885 psi)

充压安全系数比 ... 61:1

工作安全系数比 ... 8:1

Caterpillar Information System:

2007/01/15 Correction to Operation and Maintenance Manual , "Maintenance Interval Schedule" {1261}
2007/01/22 Correction to Operation and Maintenance Manual , "Maintenance Interval Schedule" {1261}
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