3508 EUI Engine for Off-Highway Truck/Tractors Caterpillar


Gear Group (Rear)

Usage:

776C 2TK



图 1g01365017

后齿轮传动系

(1) 齿圈

(3) 惰轮组件

(13) 板

注: 组装前,务必确保凸轮轴较细的一端和凸轮轴传动齿轮的锥孔清洁、干燥且无残留物。

有关左凸轮轴传动齿轮 (2) 拆卸和组装。

(5) 螺栓的扭矩 ... 140 ± 10 牛米 (105 ± 7 磅英尺)

(6) 齿轮轴

将套筒轴承装至齿轮内后,必须将套筒轴承加工至合适的尺寸。
齿轮轴直径 ... 74.990 ± 0.010 毫米 (2.9524 ± 0.0004 英寸)
加工后套筒轴承上齿轮轴孔的孔径 ... 75.060 ± 0.010 毫米 (2.9551 ± 0.0004 英寸)
平均最大粗糙度(Ra) ... 0.8 微米 (32 微英寸)

有关右凸轮轴传动齿轮 (7) 的安装步骤,请参考拆卸和组装。

(8) 惰轮轴

将套筒轴承装至齿轮内后,必须将套筒轴承加工至合适的尺寸。
惰轮轴直径 ... 81.000 ± 0.010 毫米 (3.1890 ± 0.0004 英寸)
加工后套筒轴承上惰轮轴孔的孔径 ... 81.060 ± 0.010 毫米 (3.1913 ± 0.0004 英寸)
平均最大粗糙度(Ra) ... 0.8 微米 (32 微英寸)



图 2g01256372

垂直线

(9) 请采用以下步骤拧紧凸轮轴传动齿轮的螺栓:

  1. 以 360 ± 40 牛米 (260 ± 30 磅英尺)的扭矩拧紧凸轮轴传动齿轮的螺栓。

  1. 在凸轮轴传动齿轮的螺栓头上划一条垂直线。 请参阅图2。

  1. 将一把螺丝刀插在凸轮轴传动齿轮的挡圈上。 用锤子敲击螺丝刀 3 到 4 次。

  1. 再以 360 ± 40 牛米 (260 ± 30 磅英尺)的扭矩拧紧凸轮轴传动齿轮的螺栓。



    图 3g01256393

  1. 重复第 3 和 4 步,使螺栓上的标记线至少转动 90 度。 请参阅图3。

(10) 螺栓的扭矩 ... 240 ± 20 牛米 (175 ± 15 磅英尺)

(11) 螺栓的扭矩 ... 240 ± 20 牛米 (175 ± 15 磅英尺)




图 4g01365021

发动机后视图

(14) 平衡轴齿轮组件 (4) 上的标记须与曲轴齿轮 (12) 上的标记对齐。

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