Swing Speed Is Slow
注: 开始任何故障排除步骤前，参考故障排除, "故障排除症状"。 使用 Cat® 电子技师（Cat ET）维修工具或机器监视器检查有无现行诊断代码。 如果存在诊断代码，请参阅相应的诊断代码故障排除步骤排除此故障然后再继续下一步。
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| 相关部件： | 可能原因： | 推荐行动： |
|---|---|---|
| 阀/管路 | 回转泵至马达（PM）或马达至油箱（MT）杆故障 | 参考故障排除, "IMV 标定 - 功能测试" (1) 参考故障排除, "IMV 控制性能故障排除" (2) |
| 驱动泵旁通杆故障 | 参考故障排除, "旁通阀（ACS 阀）- 功能测试" | |
| 回转安全阀压力设置低 | 参考测试和调整, KENR9615, "回转马达 - 测试" | |
| 回转安全阀故障 | ||
| 斗杆/回转暖机阀故障 | 参考故障排除, "液压系统预热 - 功能测试" | |
| 主安全阀出故障 | 参考故障排除, "安全阀（主）- 功能测试" | |
| 电子设备/线束/电磁阀 | 斗杆/回转操纵手柄故障 | 参考故障排除, "操纵手柄 - 功能测试" (1) |
| ECM 故障。 ECM 不太可能有故障。 | 更换 ECM 之前，务必向代理商的技术通信员征求 Caterpillar 可能的意见。 此咨询可能影响修理时间。 遵循故障诊断与排除, "ECM - 更换"中的步骤，以便更换 ECM。 | |
| 软件 | 左回转比例液压调节阀（PHMV）斜率电流标定不正确 | 参考故障排除, "IMV 标定 - 功能测试" |
| 左回转 PHMV 突破电流标定不正确 | ||
| 右回转 PHMV斜率电流标定不正确 | ||
| 右回转 PHMV 突破电流标定不正确 | ||
| 斜率电流值为 0mm/A 或接近 0mm/A | 参考故障排除, "IMV 标定 - 功能测试" | |
| 突破电流标定值为 0mA 或接近 0mA | ||
| 泵/马达/油箱 | 后泵未能上升 | 参考测试和调整, KENR9615, "泵流量测量" |
| 回转马达故障 | 参考测试和调整, KENR9615, "回转马达 - 测试 - 箱体排油的测量值" (2) | |
| 发动机 | 发动机转速低 | 参考故障排除, "液压功率 - 功能测试" |
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| ( 1 ) | 指示在故障排除顺序中应第一个完成的动作。 |
| ( 2 ) | 指示在故障排除过程中应作为最终选项考虑的功能测试。 |
Caterpillar Information System:
F Series Excavator Monitoring System Input Components
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Swing Velocity Is Not Smooth
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Swing Does Not Function
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Bypass Valve (ACS Valve) - Functional Test
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit IMV Calibration - Functional Test
C15 and C18 Petrolem Generator Set Engines Fuel Filter Is Restricted
C15 and C18 Petrolem Generator Set Engines Variable Valve Actuator - Test
2014/01/31 A New Valve Guide Is Used on Certain C18 Marine Engines {1100, 1101}
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Hydraulic Power - Functional Test
C4.4 Marine Generator Set Electronic Service Tools
C280-08 Tier 4 Engine Catalyst - Remove and Install
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Straight Travel - Functional Test
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Track (RH) Does Not Travel
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Track (LH) Does Not Travel
C15 and C18 Petrolem Generator Set Engines Variable Valve Actuator Response - Test
Procedure to Flash the ADEM 3 Engine Electronic Control Gp {1901, 1920} Procedure to Flash the ADEM 3 Engine Electronic Control Gp {1901, 1920}
C4.4 Marine Generator Set Indicator Lamps
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Travel Speed Is Slow
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Implement Operation Is Uncontrollable During Travel
C15 and C18 Petrolem Generator Set Engines Solenoid Valve - Test
C280-08 Marine Engine Reference Information
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Boom Up (Single Function) Speed Is Slow
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Boom Up Does Not Function
C280-08 Marine Engine Control Panel