Malfunction phenomenon: XCMG QY25K5-QY50K (including QY50B) crane's second arm and three four five arm do not change direction.
Fault description: on the car two arms shrink normally, three four five arms can not switch telescopic.
Analysis of the cause of the fault:
1: The solenoid valve of the telescopic electrolyte change valve is not charged.
2: The solenoid ring of the telescopic electrolyte change valve is open.
3: The solenoid stem of the telescopic electro-fluid shift valve is stuck.
4: Telescopic electro-hydraulic shift valve solenoid valve check valve or oil filter blocked, liquid-controlled change valve stem no pressure oil change.
5: The electro-liquid change valve stem is stuck.
Troubleshooting procedures and methods:
1: Check the electrical fluid change valve change circuit.
2: Check the solenoid coil.
3: Check that the solenoid stem is stuck.
4: Check that the solenoid valve check valve or oil filter is blocked.
5: Check the liquid-controlled shift valve stem.
Better performance
• The layout of the whole machine is optimized, the main load-bearing components are more reasonable, and the lifting performance exceeds the same tonnage products in the industry.
• The mature boom technology integrating plug-in boom head, embedded boom block and special telescopic mechanism makes the boom telescopic more stable and reliable. • Optimize the design of the force, adopt a new box-shaped outrigger, with a larger span, stronger rigidity and better stability.
More reliable quality
• Using the classic "K" series boom telescopic technology, the operation is safer and more reliable.
• Carefully build the most complete safety device system in the industry to ensure safer and more reliable lifting operations.
• A fully upgraded braking system, dual-circuit air pressure design, and multiple systems to ensure the safety of braking when the vehicle is driving.
• The brand-new power steering mechanism adopts hydraulic power assist design to make the vehicle steering lighter, more flexible and precise, ensuring vehicle safety at all times.
• The high-rigidity turntable and frame structure are fully coordinated with strength and rigidity.
• The perfect integration of design and structural process manufacturing realizes complete welding automation and higher reliability.
Easier control
• High-efficiency and energy-saving load-sensitive hydraulic system, sensitive and comfortable operation, precise control, and good micro-movement.
• Optimize the lever-type operating mechanism to make the operation easier.
• The control room adopts a large arc front windshield, which makes the control field more open.
Easier maintenance
• The newly optimized design of pipeline routing, the layout is more scientific and reasonable, which greatly shortens the time of pipeline disassembly and assembly, and reduces maintenance costs.
• Fully upgrade the electrical system and adopt anti-leakage connectors, which greatly extend the service life of components.
• Adopt the "K" series anti-chaotic rope technology to improve the efficiency of lifting operations, reduce labor intensity, and extend the life of the steel rope.
• Well-designed telescopic wire rope guide and protection device to prevent the wire rope from falling off and breaking.
• Full coverage of the platform to provide a platform for vehicle maintenance and effectively protect vehicle components.
Energy saving and environmental protection
• Adopt dual industrial control mode engine, strong power, economical and energy saving.
• Under the economic mode, it can meet the engine power requirements of conventional lifting operations, and under the high power mode, it can effectively support the requirements of difficult and high-efficiency lifting operations.
• Use high-power heat dissipation equipment to avoid poor system heat dissipation, solve the problem of excessive oil temperature, and extend the use time of hydraulic oil.
• Using advanced machine matching technology, the design is more scientific, the mechanism loss is reduced, the service life of the machine is prolonged, and the equipment residual value rate is high.
Post time: Aug-21-2020