Loader Lacks Power: Cause Analysis and Solutions

I. Hydraulic System Failures Causing Insufficient Power The hydraulic system is the core of a loader's power transmission. The following problems can lead to a lack of power: 1. Insufficient or degraded hydraulic oil: When the oil level falls below the standard line (typically 80% of the tank capacity) or the oil has been in use for over 2,000 hours without replacement, the oil's viscosity drops and its lubricating performance decreases. The oil level should be checked regularly, and the oil should be replaced every 2,000 hours (refer to the "Maintenance Specification for Hydraulic Systems of Construction Machinery"). 2. Hydraulic pump wear: When the clearance between gears or plungers inside the pump exceeds 0.1 mm (requiring specialized measuring tools for detection), the pressure will drop from 20 MPa to below 15 MPa, manifesting as weak lifting force. Worn parts or the entire pump body should be replaced. 3. Sticking of the distribution valve: Contaminants causing the spool to stick can lead to poor oil flow. The valve needs to be disassembled for cleaning or the valve assembly should be replaced. II. Common Causes of Deteriorated Engine Performance 1. Fuel supply issues: - A clogged diesel filter (recommended replacement every 500 hours) can lead to insufficient fuel supply, preventing the engine from reaching its rated speed (e.g., rated at 2,200 rpm but actually only reaching 1,800 rpm). - Poor atomization of the fuel injector nozzles: when injection pressure falls below 18 MPa, calibration or replacement is required. 2. Intake system blockage: A clogged air filter (needs replacement when the pressure differential exceeds 5 kPa) or a turbocharger malfunction leads to incomplete combustion. 3. Insufficient cylinder pressure: When measured with a pressure gauge, if the pressure in a single cylinder falls below 2.5 MPa, the piston rings or valve sealing need to be inspected and repaired. III. Effects of the Transmission System and Operating Habits 1. Torque converter or gearbox failures: - When the torque converter stator slips, output torque drops by more than 30%, requiring inspection of the lock-up clutch. - When the gearbox oil temperature exceeds 120°C (normal range: 80-100°C), lubrication fails, requiring inspection of the radiator. 2. Improper operation accelerates wear: - Prolonged overload (exceeding the rated load by 10%) accelerates component fatigue. - Frequent operation in a half-clutch state causes overheating of the friction plates. Preventive Maintenance Recommendations: - Check the hydraulic oil level and engine oil condition before daily operations. - Clean the radiator fins every 250 hours to prevent overheating. - Adopt the "segmented bucket loading" method to reduce instantaneous loads and extend equipment service life. By systematically inspecting the key points above, more than 90% of insufficient power problems can be resolved. If the fault persists, it is recommended to use professional diagnostic equipment to check the parameters of the electronic control system (e.g., ECU data stream).