Truck crane in the course of driving, sometimes there will be some failures, affecting work efficiency, how to solve it? The following is a guide to common faults and maintenance of crane power system and transmission system.
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Fault symptoms and repair methods of mobile crane power system
| Fault phenomenon | Cause of failure | Repair method |
| Engine coolant temperature too high | Dirty radiator exterior | Clean the surface of the radiator |
| Radiator internal blockage | Clean the inside of the radiator or replace the radiator. | |
| Damaged water pump | repair | |
| Thermostat damage | repair | |
| When the water temperature of the engine is high, it will automatically enter the protection state. | Proceed as if the engine water temperature is too high | |
| Insufficient antifreeze | Check and replenish antifreeze. | |
| Engine power is insufficient | When the water temperature of the engine is high, it will automatically enter the protection state. | Proceed as if the engine water temperature is too high |
| Faulty engine fuel system | Check the fuel system for blockage and air leakage | |
| Engine aftertreatment fault | Handle the fault according to the engine after-treatment | |
| Engine emitting | Intercooler or intercooler pipe is blocked | Clean the intercooler and intercooler pipeline, and replace the intercooler if necessary |
| black smoke | The fuel line is blocked | Replace air filter element and safety filter element |
| Fuel filter clogged | Replace the fuel filter | |
| Engine emitting blue smoke | Intercooler cooling controller or fan electrical fault | Check whether relevant electrical connectors and lines are faulty. If there is no fault, replace the fan or controller if necessary. |
| Air filter is blocked | Replace the air filter element and safety filter element | |
| Oil enters the cylinder and burns | repair | |
| Engine was emitting white smoke | Water in oil | Replace the diesel fuel or drain the water in the fuel filter |
| Engine does not start | Battery power is low or there is a problem with the circuit from the battery to the engine | Replace or charge the battery, check and restore the circuit |
| Excessive viscosity of engine oil caused by low temperature | Heating oil pan | |
| Key switch damaged | Replace key switch | |
| Start relay damaged | Replace starting relay | |
| Starter motor damaged | Repair or replace the starter motor | |
| low fuel | Refill fuel | |
| Too much gas in the fuel line | Use the fuel filter and the hand pump on the engine block to purge air. | |
| Damage of electric control system | repair | |
| Transmission neutral signal missing | The transmission is not in neutral or the transmission neutral sensor is damaged |
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Breakdown and maintenance of transmission system of hydraulic truck crane
| Fault phenomenon | Cause of failure | Repair method |
| Clutch slipping | Friction pads are stained with oil | Remove the oil dirt on the clutch pressure plate, driven plate and flywheel |
| Clutch free travel is too small | Check the free travel of the clutch pedal， adjust it if it is not suitable. | |
| The clutch is overheated and the friction plate is ablated. | Replace the driven plate assembly | |
| Coil spring failure | Replace the pressure plate assembly | |
| Incomplete clutch release | The clutch pedal free travel is too large, the working travel is insufficient, and the clearance between the push rod and the master cylinder ball joint is too large. | Adjust as required |
| Driven plate and pressure plate are warped. | Replace the driven plate or pressure plate | |
| The spline teeth are rusted and stuck, and the axial movement of the driven disc is not smooth. | Repairing damage to spline mating pairs, removing dirt, oil, and rust. | |
| The friction plates got damp and stuck to the flywheel. | Treat the friction surface. If the adhesion is serious, replace the driven disc assembly. | |
| Lack of oil in the brake fluid circuit system, insufficient oil pressure or air | Check and solve the sealing of the oil circuit system, add oil, and remove the air in the oil circuit. | |
| Clutch sounds | The bearing pin of the clutch has too large wear clearance, which causes the parts to collide with the clutch cover at the moment of sudden change of speed. | Replace the clutch pressure plate |
| Oil shortage of release bearing | Replenish lubricating oil | |
| Vehicle starts trembling | Driven plate or pressure plate is warped or deformed, and the pressing force is not enough. | Replace the driven plate or pressure plate |
| The engine support pad is damaged or the screw is loose, and the foot brake or hand brake is dragging. | Find out the cause and eliminate the fault | |
| Transmission noise and abnormal sound | Insufficient or deteriorated lubricating oil | Supplement or replace lubricating oil |
| loose fasteners | Retighten | |
| Parts are damaged or gears are worn, and clearance is increased | repair | |
| Difficulty shifting gears | Incomplete clutch release | Adjust the clutch and control mechanism |
| The control mechanism is out of balance, and the joints are worn and loose. | Replace, adjust | |
| Transmission oil leak | The vent is clogged | Clear and dredge |
| Sealing element failure or box body damage | repair | |
| Transmission oil temperature too high | Too much oil | Check the oil level to the lower edge of the oil overflow port. |
| Oil Quality Change | Replace with new oil | |
| Worn moving parts or small gear clearance | repair | |
| Skip gear | The control mechanism is severely worn. | Adjust or replace damaged parts |
| Block randomly | Interlocks are worn or damaged | repair |
| Bearing sintering at the joint of input shaft and output shaft | repair | |
| Oil leakage of power take-off | Air plug blockage | Cleaning and dredging |
| Damaged oil seal | repair | |
| Power take-off temperature is too high | Transmission oil level is too high | Check the oil level to the lower edge of the oil overflow port. |
| The power take-off cannot be engaged or disengaged | Air leak in gas connection | Sealing and fastening |
| Damaged shift spring or damaged cylinder seal | repair | |
| Abnormal noise of power take-off | Severe pitting or fracture of gears or bearings | repair |
| The vehicle vibrates greatly during driving. | The middle support of transmission shaft is loose | Retighten |
| Loose drive shaft fasteners | Re-tighten or replace bolts and nuts |
The above are professional solutions to common faults of cranes. If you encounter other special circumstances or problems in the process of equipment operation, please feel free to contact us! As a professional truck crane supplier, we can not only provide you with a full range of technical support and guidance, but also supply Originalcrane partsto ensure that the equipment is always in stable and efficient operation, so as to protect your operation safety and production efficiency.