Visual Inspection
对故障进行诊断与排除时，第一步就是对系统进行目视检查。 应在发动机停机且机具降到地面上时进行检查。
- 检查液压油箱中的油位。 缓慢松开加注 / 排气螺塞以释放压力，然后拆下加注 / 排气螺塞。
- 拆下液压滤清器滤芯，检查是否有指示部件受损坏的物质。
- 检查所有管路和连接是否损坏或泄露。
- 检查控制连杆机构有无部件弯曲、断裂或损坏。
Caterpillar Information System:
302.5C Mini Hydraulic Excavator Hydraulic System Cylinder Speed - Check
302.5C Mini Hydraulic Excavator Hydraulic System Travel on Level Ground - Test
302.5C Mini Hydraulic Excavator Hydraulic System Engine Performance - Test - Engine Speed
303C CR and 303.5C CR Mini Hydraulic Excavators Hydraulic System General Testing and Adjusting Information
303C CR and 303.5C CR Mini Hydraulic Excavators Hydraulic System Hydraulic System Pressure - Release
302.5C Mini Hydraulic Excavator Hydraulic System Swing Speed and Swing Drift on a Slope - Check
302.5C Mini Hydraulic Excavator Hydraulic System Machine Drift on a Slope - Check
302.5C Mini Hydraulic Excavator Hydraulic System Main Hydraulic Pump Air - Purge
302.5C Mini Hydraulic Excavator Hydraulic System Operational Checks
302.5C Mini Hydraulic Excavator Hydraulic System Swing Speed and Overswing on Level Ground - Check
302.5C Mini Hydraulic Excavator Hydraulic System Relief Valve (Line) - Test and Adjust
302.5C Mini Hydraulic Excavator Hydraulic System Specifications
302.5C Mini Hydraulic Excavator Hydraulic System Cylinder Drift - Check
303C CR and 303.5C CR Mini Hydraulic Excavators Hydraulic System Accumulator (Pilot) - Test and Charge
345C MHPU Mobile Hydraulic Power Unit Engine Supplement Engine - Install
C18 Generator Sets Cooling System Supplemental Coolant Additive (SCA) - Test/Add
390D Excavator Machine Systems Actuator Motor (Air Distributor) - Remove and Install
390D Excavator Machine Systems Blower Motor (Air Conditioner, Heater) - Remove and Install
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Heater Core - Remove
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Heater Core - Install
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Evaporator Coil - Remove
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Evaporator Coil - Install
390D Excavator Machine Systems Coolant Temperature Sensor - Remove and Install
390D Excavator Machine Systems Temperature Sensor (Cab Air) - Remove and Install