793F and 797F Off-Highway Trucks Braking System Caterpillar


Brakes Overheat

Usage:

793F D3T

可能原因

  • 停车制动器

  • 制动器冷却系统

  • 行车制动盘

建议的措施

停车制动器

停车制动器通过弹簧接合和通过液压释放。

虽然停车制动器应用为机械式,从停车制动器释放系统排出空气也是重要的。 在发动机运行的同时,驱动停车制动器开关五次。 此动作可排出管路中的空气。 以 1 分钟的间隔驱动制动器。 停车制动器将在空气排净后释放。

应通过 Cat 电子技师核实制动系统压力。

参考测试和调整, kENR8738, "制动系统压力 - 测试和调整"。

制动器冷却系统

注: 797F 卡车没有配备下述优先阀。

当转向系统的需求得到满足时,优先阀将油从转向泵引至制动器冷却马达。 制动器冷却马达驱动制动器冷却泵。 制动器冷却泵将油送往以下部件。

  • 前制动器油冷却器的滤网

  • 后制动器油冷却器的滤网

  • 后制动器油冷却器

  • 前制动器油冷却器

  • 后轮行车和停车制动器

  • 前轮行车和停车制动器

来自举倾阀的机油流过举倾和制动冷却的机油滤清器。 机油随后流至前制动器油冷却器和后制动器油冷却器。 此油流为制动器提供了额外冷却油。

参考系统操作, kENR8738, "制动器冷却系统"。

参考系统操作, kENR8738, "齿轮泵(制动器冷却)"。

参考测试和调整, kENR8738, "马达旋转总成(制动器冷却) - 调整"。

参考测试和调整, kENR8738, "安全阀(制动器油冷却器)- 测试和调整"。

行车制动盘

行车制动器和减速器采用液压接合和弹簧分离形式。 当行车制动器或减速器接合时,油通过松紧调整器送往行车制动器和减速器油道。

检查钢板厚度,有无表面刻痕,有无放射状沟槽,以及有无弯曲。

参考测试和调整, kENR8738, "行车制动盘 - 检查(标准型)"。

参考测试和调整, kENR8738, "行车制动盘 - 检查(经久耐用型)"。

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