773D Off-Highway Truck and 775D Quarry Truck Power Train Caterpillar


Rear Wheel Bearing - Adjust

Usage:

773D 7CS


图 1g00852920
(1) 心轴
(2) 垫片
(3) 固定板
(4) 螺栓


图 2g00104540
典型范例
停车制动器净化阀位置

注: 在进行调整前,需要释放制动器。 为释放停车制动器,从开口 ( A)上拆下净化阀。 此开口标有一个"P"。 然后,连接手动液压泵或电动液压泵至开口 ( A)。 连续操作泵直到制动器完全释放。 要了解有关释放制动器详细信息,请参见空气系统和制动 系统操作、测试和调整 中的拖引信息。


注意

如果有必要采用外部液压源释放停车制动器,不要超过停车和辅助制动器控制阀的安全压力。 超过安全压力会对回路中的密封件和其他零件造成损坏。


调整程序

  1. 彻底清洁心轴 (1)端部的所有螺纹孔。


    图 3g00836690
    A-A 视图
    (3) 固定板
    (4) 螺栓

  2. 将固定板 (3)和四个新螺栓 ( 4)安装在心轴 (1)上。 安装螺栓 (4),使每一螺栓与固定板 ( 3)等距。

    注: 此时不要使用任何垫片 ( 2)。

  3. 拧紧螺栓 (4)至扭矩为 140 N·m (103 lb ft)。 转动车轮两整圈。

  4. 拧紧螺栓 (4)至 140 N·m (103 lb ft)。 转动车轮两整圈。

  5. 将螺栓 (4)松开 120 度。 转动车轮两整圈。

  6. 拧紧螺栓 (4)至扭矩为 70 ± 5 N·m (52 ± 4 lb ft)。 转动车轮两整圈。

  7. 拧紧螺栓 (4)至扭矩为 70 ± 5 N·m (52 ± 4 lb ft)。 转动车轮两整圈。

  8. 拧紧螺栓 (4)至扭矩为 70 ± 5 N·m (52 ± 4 lb ft)

  9. 使用深度千分尺确定固定板 ( 3)的外表面至心轴 ( 1)端部的距离。 测量固定板 ( 3)上相对两孔的深度。 根据这两个测量值计算出平均深度。

  10. 使用外径千分尺确定固定板 ( 3)在螺栓孔处的厚度。 测量固定板 (3)的厚度(在步骤 9使用的相同位置)。 根据这两个测量值计算出平均厚度。

  11. 在心轴 (1)端部与固定板 ( 3)内表面之间找到间隙。 要找到此间隙,从步骤 9中找到的尺寸中减去步骤 10中找到的尺寸。

  12. 计算垫片组厚度。 增加 0.230 + 0.000 − 0.050 mm (0.009 + 0.000 − 0.002 inch)至步骤 11中找到的间隙。

  13. 组装垫片组 (2)以使垫片组厚度等于步骤 12中找到的数值。 拆下螺栓 (4)和固定板 ( 3)。

  14. 安装垫片组 (2)。

  15. 将固定板 (3)安装在垫片组 ( 2)上。 安装十个新螺栓 ( 4)。

    注: 在安装之前,将 9S-3263 螺纹锁固胶涂覆在螺栓 (4)上。

  16. 按照交替的星形顺序将螺栓 ( 4)均匀地拧紧到 250 ± 15 N·m (185 ± 10 lb ft)

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