770 and 772 Off-Highway Truck Suspension Cylinder Caterpillar


Front 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 1g01342368



图 2g01342240



图 3g01342273

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 ... 170.0 mm (6.69 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(前)- 排气和充压"。

(1) 根据需要,使用 301-5245 垫片 。

(2) 安装轴承盖,以将锁圈放下。

(3) 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)

(4) 20 个螺母的扭矩 ... 1050 ± 75 N·m (774 ± 55 lb ft)

(5) 垫片 ... 4.47 ± 0.08 mm (0.176 ± 0.003 in)

注: 请参阅转向系统测试和调整, "前桥 - 安装和调整",以确定应当安装的垫片厚度。

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

处置支撑杆比较危险,可能会造成人员伤亡。

拆卸板组件时,突然从支撑杆上释放心轴或者螺栓突然折断,可能会造成人身伤害。

将所有螺栓每次旋松半圈,如此循环来拆卸板组件。 重复执行此操作,直到螺栓扭矩得以释放。


(6) 螺栓的最终扭矩 ... 680 ± 35 N·m (502 ± 26 lb ft)

注: 770 非公路卡车的 299-7981 前悬架总成 在位置 (6) 有八个螺栓。 772 非公路卡车的 299-7983 前悬架总成 在位置 (6) 有十个螺栓。

注: 执行转向系统测试和调整, "前轮轴 - 安装和调整"后再安装这些螺栓。

(7) 28 个螺栓的扭矩

28 个螺栓的静态检查扭矩 ... 60 N·m (44 lb ft)
28 个螺栓的组装扭矩 ... 135 ± 20 N·m (100 ± 15 lb ft)

(8) 组装前,涂抹 8T-9014 硅密封剂 。

(9) 十个螺栓的扭矩 ... 135 ± 20 N·m (100 ± 15 lb ft)

(10) 活塞外径(两道棱上) ... 201.17 ± 0.13 mm (7.920 ± 0.005 in)

(11) 管的内径 ... 203.25 + 0.13 − 0.05 mm (8.002 + 0.005 − 0.002 in)

(12) 密封管的内径(三个位置) ... 178.18 ± 0.03 mm (7.015 ± 0.001 in)

(13) 组装后,用 7X-7664 润滑脂 充注下部腔体。

(14) 连杆的外径 ... 177.72 ± 0.05 mm (6.997 ± 0.002 in)

(15) 涂抹一层 4C-5593 防咬合剂 后再与心轴一起组装。

注: 需要在油缸内充入大约 13.8 L (3.6 US gal) 当前使用级别的 SAE 10W 油。

注: 如果拆解了前悬架油缸,只能在竖直位置重新组装油缸。

悬架油缸的充压介质为干燥氮气。

内部容积 ... 5.937 L (362 in3)

充入压力 ... 1200 kPa (175 psi)

工作压力 ... 3500 kPa (500 psi)

破裂压力 ... 35000 kPa (5075 psi)

充压安全系数比 ... 29:1

工作安全系数比 ... 10.2:1

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