A truck crane is a device that uses a hydraulic lifting and telescopic system to achieve the lifting, rotation and hoisting of goods. It is usually installed on a truck.

Una grúa sobre camión es un dispositivo que utiliza un sistema hidráulico de elevación y telescópico para lograr la elevación, rotación e izado de mercancías. Generalmente se instala en un camión.

Truck cranes may have a variety of faults during long-term use. The following are common faults and their repair methods:

1. The crane does not work or the lifting capacity decreases

  La grúa no funciona o la capacidad de elevación disminuye.

Oil pump does not work: Check whether the air pressure reaches 6/7 pressure, whether the power take-off power switch and solenoid valve are powered, and whether the air path is unobstructed. If the power take-off handle is not pushed into place, it needs to be pushed into place; if the gear of the power take-off box is damaged, it needs to be repaired or replaced; if the transmission sleeve is damaged, it needs to be replaced; if the oil pump is burned, it needs to be replaced.
The oil pump works but the speed is unstable: Check whether the hydraulic oil is sufficient and add enough hydraulic oil. Check whether the oil filter is blocked and clean or replace it if necessary.

2. Hydraulic system pressure is too low

La presión del sistema hidráulico es demasiado baja

System leaks: Check all pipes and components and repair leaks.
Improper adjustment of the overflow valve pressure: adjust the overflow valve pressure to the specified value (14Mpa for 2~3 ton cranes, 17.5Mpa for 5~8 ton cranes). If it fails, it needs to be repaired or replaced.
Reduced oil pump volumetric efficiency: The oil pump needs to be replaced.

3. The luffing cylinder is weak

El cilindro de elevación es débil

Sealing ring damage: The sealing ring in the boom cylinder is damaged, causing increased internal leakage. Replace the seal and piston.
Damage to the piston or cylinder: The piston in the luffing cylinder is damaged or the steel barrel of the luffing cylinder is deformed, causing increased internal leakage. Replace it if necessary.

4. The winch is weak or the cargo falls naturally

El cabrestante está débil o la carga cae naturalmente.

The efficiency of the winch motor is reduced: the volumetric efficiency of the winch plunger oil motor is reduced, so replace the winch plunger oil and motor.
The balancing valve or hydraulic lock is damaged: Repair or replace the balancing valve or two-way hydraulic lock.
The friction brake pad is damaged: replace the brake pad.

5. Outrigger failure/ Fallo del estabilizador

Cylinder sinks: Check the two-way hydraulic lock or cylinder seal and replace if necessary.
Outrigger retraction and extension failure: Clean or adjust the hydraulic lock and check for leakage in the cylinder.

6. Loud noise or hydraulic valve squealing/Ruido fuerte o chirrido de la válvula hidráulica

The oil suction pipe is blocked or the oil viscosity is too high: clean the filter and replace the appropriate hydraulic oil.
Air has entered the system: Check for tightness and remove air.

7. Failure of the slewing mechanism/Fallo del mecanismo de giro

The clearance of the slewing bearing is too large: Check the gear wear and replace it if necessary.
Hydraulic motor or control valve failure: Repair or replace worn parts.

8. Electrical or operating mechanism failure/Fallo eléctrico o del mecanismo operativo

Poor circuit contact or damaged switch: Check the electrical system and replace damaged parts.
Connecting rod deformed or spring damaged: Check and replace damaged parts.

9. Maintenance suggestions/Sugerencias de mantenimiento

Check the quantity and quality of hydraulic oil regularly to keep the oil circuit clean.
Avoid overloading operation and prevent overloading of the hydraulic system.
Regularly lubricate key parts such as the boom and slewing mechanism

Summarize

As a complex mechanical equipment, the common faults and maintenance methods of truck cranes are relatively complicated. Proper mastery of basic knowledge and maintenance skills can ensure its normal operation. At the same time, it is necessary to pay attention to the daily maintenance and care of truck cranes to improve the working efficiency of the crane and extend its service life.

Como equipo mecánico complejo, las fallas comunes y los métodos de mantenimiento de las grúas montadas sobre camión son bastante complicados. El dominio adecuado de los conocimientos básicos y las habilidades de mantenimiento puede garantizar su funcionamiento normal. Al mismo tiempo, se debe prestar atención al mantenimiento y cuidado diario de la grúa para camión para mejorar la eficiencia de trabajo de la grúa y extender su vida útil.

How to buy   Truck mounted crane maintenance related accessories at CCMIE?

If you need to buy Truck mounted crane /Grúa montada en camión , you can contact us. If you need to buy a second-hand  Truck mounted crane , you can also contact us. CCMIE provides you with comprehensive  Truck mounted crane.