992K Wheel Loader Electrohydraulic System Caterpillar


Pump Performance (Implement) (Lift Time) - Test

Usage:

992K H4C

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

压力下液体溢出可能会导致人身伤害或死亡。

压力下液体溢出,即使仅为针孔般大小的漏洞,也会渗透人体组织,导致严重的伤害,甚至可能导致死亡。

检查渗漏时,请务必使用木板或硬纸板作为挡板。

不要在转向停止的状态下检查泵或马达软管的针孔泄漏。

如果液体喷射穿透进您的皮肤,必须立即找熟悉这类型创伤的医生处置。


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

机器突然动作,会招致人员伤亡。

机器突然动作或在压力下放油,可能对机器上或机器附近的人员造成伤害。

为避免可能造成的伤害,在测试和调整液压和转向系统之前,遵照以下程序:


执行以下测试是为了确认中间机具泵和右侧机具泵的性能。

  1. 把机器移到坚硬、水平和无碎屑的表面。

  1. 机器上仅允许停留一位操作员。 其它人员远离机器。

  1. 反复按小键盘上的 "OK(确定)"按钮。 小时计将出现在诊断屏幕上。

  1. 在 "VIMS" 小键盘上,输入 "SERV(7378)",然后按 "OK(确定)"按钮。 按 ">" 键直到诊断信息屏的下方线条上显示 "LFT CNTR PUMP - CHK(提升中间泵 - 检查)"。 然后按 "OK(确定)"按钮。

    表 1
    "SELECT CALIBRATION(选择 CALIBRATION(标定))"
    "LFT CNTR PUMP - CHK(提升中间泵 - 检查)"    

  1. 诊断信息屏上将会显示 "LFT CNTR PUMP - CHK(提升中间泵 - 检查)"信息。 按下 "OK(确定)"开始标定。 诊断信息屏上将会显示维修模式的所有说明。

    表 2
    "CNTER PUMP - CHK(中间泵 - 检查)"
    "PRESS [OK] TO START(按 [OK](确定)开始)"    

  1. 接合停车制动器。

  1. 断开液压锁定开关。

    表 3
    "机具"
    "锁定"    

  1. 将液压油加热到温度为 50 °C (122 °F)。 按下 "NEXT(下一步)"按钮。 如果液压油温已达到规定温度,按下 "OK(确定)"按钮。

    表 4
    "WARM HYD OIL TO"
    "(50-55) XX DEG C(将液压油加热到(50-55)XX °C)"    

  1. 缓慢将铲斗置于完全机架回倾位置。 然后按 "OK(确定)"按钮。

    表 5
    "TILT BKT BACK FULLY(完全后倾铲斗)"
    "THEN PRESS [OK](然后按下 [OK](确定))"    

  1. 将连杆缓缓降至最低位置。 然后按 "OK(确定)"按钮。

    表 6
    "LOWER BOOM FULLY(完全降下动臂)"
    "THEN PRESS [OK](然后按下 [OK](确定))"    

  1. 升高发动机转速到高怠速。

    表 7
    "SLOWLY INCREASE ENG"
    "SPD TO MAX AND HOLD(将发动机转速缓慢升高至最大并保持)"    

  1. 松开提升和倾斜操纵杆。 然后按 "OK(确定)"按钮。

    表 8
    "RELEASE LEVERS(松开操纵杆)"
    "THEN PRESS [OK](然后按下 [OK](确定))"    

  1. 将提升操纵杆移至完全升起位置。 在剩余部分的测试中,将操纵杆保持在此位置。

    表 9
    "PULL AND HLD LFT LVR"
    "AT FULL RAISE(拉动并将提升操纵杆保持在完全升起位置)"    

  1. 诊断屏幕上将会显示实际提升时间。 比较该时间与目标时间。 目标提升时间为 17.3 ± 2 秒。

    表 10
    "LIFT TIME = XX.X SEC(提升时间 = XX.X 秒)"
    "SPEC VAL = 17.3 SEC(技术规格值 = 17.3 秒)"    

  1. 松开提升操纵杆。 然后按 "NEXT(下一步)"按钮。

  1. 对左侧机具泵重复步骤 4 到 15。 从诊断显示屏上选择步骤 4 中的 "LFT RT R PUMP - CHK(提升右后泵 - 检查)"并继续。

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