When a 7 ton forklift fails and cannot be operated, technicians will find the difference between it and normal operation during diagnosis and determine the fault point. Common forklift failure phenomena include the following:
1. Abnormal movement; 2. Abnormal sound; 3. Abnormal appearance; 4. Abnormal smell; 5. Abnormal temperature, etc.
If the driver of the forklift has a certain amount of experience, he or she may be able to detect the first failure symptoms of the counterbalance lift truck and eliminate them in time to avoid causing a larger failure and causing losses. Below, will share with you three methods to quickly diagnose whether the forklift is fault-free:
1. Give signals by checking the forklift's own instrument, such as displaying relevant fault codes and some warning light prompts.
2. Test drive, you can use your own feelings to find out whether there are any abnormalities in the operation of the forklift, such as whether the operation is weak, whether the braking system has failed, whether there are any abnormal noises when the various parts are operating, etc.;
3. Have you ever discovered this potential fault point of the forklift during regular maintenance of the forklift? In addition, in addition to the above three points, the diagnosis of forklift faults should also be based on the diagnostic parameters and diagnostic accessories of its technical condition. These physical or chemical quantities should be used to determine changes in the technical condition of a certain system of the forklift or the occurrence of symptoms. Then make a decision and make repairs. as follows:
1. Has the power performance declined? The diagnostic parameters include: speed, torque, power, acceleration time, and deceleration time. Diagnosis objects: cylinder-piston and valve train, fuel system, lubrication system.
2. Decline in economic performance? The diagnostic parameters include: fuel consumption, lubricating oil consumption, pressure and temperature of the intake and exhaust systems, cooling system temperature, and lubricating oil temperature and pressure. Diagnostic objects: intake and exhaust systems, fuel systems, cooling systems, and lubrication systems.
3. Changes in working volume sealing performance. The diagnostic parameters include: cylinder compression pressure, cylinder air leakage rate, crankcase blow-by volume, crankcase pressure, and starting current of the starter. Diagnosis objects: cylinder, piston group, crank connecting rod mechanism and valve train.
4. Changes in matching dimensions of the matching pair. Diagnostic parameters include: vibration acceleration amplitude and frequency, noise level and frequency, lubricating oil pressure, and lubricating oil quality analysis. Diagnostic objects: clearances of each matching pair, bearings, gears, etc.
5. Changes in the physical and chemical properties and composition of lubricating oil and coolant. Diagnostic parameters include: viscosity, acid value, moisture content, wear particle size, concentration, composition, etc. Diagnostic objects: friction pairs, lubrication systems, and cooling systems in relative motion.
6. Changes in exhaust gas composition. Diagnostic parameters include: smoke, temperature, pressure, etc. Diagnostic objects: fuel system, intake and exhaust systems.
7. Changes in thermal conditions. Diagnostic parameters include: temperature and the speed of temperature change. Diagnostic objects: cooling system and lubrication system.