Implement Operation Is Uncontrollable During Travel
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 | 直行阀故障 | 请参考故障排除, "直行 - 功能测试" |
| 直行先导软管未连接或有泄漏 | 执行直行先导软管的目视检查 | |
| 电子设备/线束/电磁阀 | 直行比例液压调节阀（PHMV）电磁阀故障 (1) | 参考故障排除, "直行 - 功能测试" |
| 直行 PHMV 对地短路 | 请参阅相应的诊断代码故障排除步骤 | |
| 软件 | 直行 PHMV 斜率电流或突破电流标定不正确 | 参考故障排除, "直行 - 功能测试" |
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| ( 1 ) | 请参阅相应的诊断代码故障排除步骤 |
Caterpillar Information System:
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Travel Speed Is Slow
C4.4 Marine Generator Set Indicator Lamps
Procedure to Flash the ADEM 3 Engine Electronic Control Gp {1901, 1920} Procedure to Flash the ADEM 3 Engine Electronic Control Gp {1901, 1920}
C15 and C18 Petrolem Generator Set Engines Variable Valve Actuator Response - Test
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Track (LH) Does Not Travel
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 Swing Speed Is Slow
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 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
390F Excavator Machine Systems Counterweight - Remove and Install
2015/05/22 New Software Is Used on Certain C27 Industrial Engines {1901, 1920}
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Boom Up Does Not Respond To Progressive Joystick Motion
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Boom Down (Single Function) Speed Is Slow
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Boom Down Does Not Function
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Boom Down Does Not Respond To Progressive Joystick Motion
C280-08 Marine Engine Engine Protective Devices - Check