# Loader Lack of Power: Cause Analysis and Solutions

I. Insufficient Power Caused by Hydraulic System Failures The hydraulic system is the core of power transmission in a loader. The following problems can cause a "lack of power": 1. Insufficient or deteriorated hydraulic oil: If the oil level is below the standard line (usually 80% of the tank volume) or the oil has been used for more than 2,000 hours without replacement, the oil viscosity will decrease and lubrication performance will deteriorate. The oil level must be checked regularly, and the oil must be replaced every 2,000 hours (refer to the "Hydraulic System Maintenance Specifications for Construction Machinery"). 2. Hydraulic pump wear: When the clearance between the gears or plungers inside the pump exceeds 0.1 mm (requires specialized measuring tools for detection), the pressure will drop from 20 MPa to below 15 MPa, manifesting as weak lifting. Worn components or the entire pump body must be replaced. 3. Distribution valve sticking: If the valve spool is stuck by impurities, the oil circuit will be obstructed. The valve assembly must be disassembled and cleaned or replaced. II. Common Causes of Engine Performance Degradation 1. Fuel supply problems: - A clogged diesel filter element (recommended replacement every 500 hours) will cause insufficient fuel supply, and the engine speed cannot reach the rated value (for example, rated 2,200 rpm, actual only 1,800 rpm). - Poor atomization of the fuel injector: when the injection pressure is below 18 MPa, calibration or replacement is required. 2. Intake system blockage: A clogged air filter (replacement required when the pressure difference exceeds 5 kPa) or a turbocharger failure will cause incomplete combustion. 3. Insufficient cylinder pressure: Use a pressure gauge for detection. If the pressure of a single cylinder is below 2.5 MPa, the piston rings or valve sealing performance must be inspected and repaired. III. Effects of the Transmission System and Operating Habits 1. Torque converter or gearbox failure: - When the torque converter guide wheel slips, the output torque drops by more than 30%, and the lock-up clutch must be checked. - If the gearbox oil temperature exceeds 120°C (normal range 80-100°C), lubrication will fail, and the radiator must be checked. 2. Improper operation aggravates wear: - Long-term overloading (exceeding the rated load by 10%) will accelerate component fatigue. - Frequent operation in a half-clutch state will cause the friction plates to overheat. Preventive maintenance recommendations: - Check the hydraulic oil level and engine oil condition before daily operation. - Clean the radiator fins every 250 hours to prevent overheating. - Adopt the "segmented scooping" method to reduce instantaneous load and extend equipment life. By systematically troubleshooting the above key points, more than 90% of insufficient power problems can be solved. If the fault still exists, it is recommended to use professional diagnostic equipment to detect electronic control system parameters (such as ECU data streams).