When we drive a dump truck, what should we do if some failures occur in the cylinder? Today, I will tell you about some common faults and solutions:
|
Fault |
reason |
Solution |
|
Cylinder does not lift |
• PTO not working • no main gas source • The rotary valve at the bottom of the fuel tank is not open • air pressure is too low • Air control valve internal fault • Limit valve stem stuck • Limit valve spool does not work properly • Lift valve internal stem stuck • Lift valve air chamber blowby • Wrong connection of air or oil circuit • No oil coming out of the oil circuit |
• Repair power take-off • Check whether the main air source pipeline is unobstructed • Open the rotary valve and check if the hydraulic oil meets • Start the engine so that the air pressure reaches above 7Bar • Replace air control valve • Check whether the limit valve stem is flexible and flexible • Replace limit valve • Clean and replace lift valve body and stem • Replace lift valve kit • Check whether the air circuit and oil circuit are connected correctly • Check the oil circuit and oil pump |
|
The speed of the oil cylinder is too slow when it is lifted and lowered |
• air pressure is too low • oil pump failure • Air leakage • The trachea is bent • lift valve , stem sticking • Lift valve air chamber blowby • stuck in lift valve • The viscosity coefficient of hydraulic oil is too high |
• Start the engine so that the air pressure reaches above 7Bar • replace oil pump • Replace the trachea and tighten the connector • Rearrange the direction of the trachea • Cleaning and overhauling lift valve body and stem • Replace lift valve kit • Replacing the check valve in the lift valve • Replace with suitable hydraulic oil |
|
Cylinder does not fully lift |
• severe overload • Insufficient oil level in the fuel tank • oil pump failure |
• manual unloading • Add the original type of hydraulic oil • replace oil pump |
|
Cylinder does not fully lift |
• air pressure is too low • Limit valve installation position is not correct • Pressure relief valve value too low |
• Air pressure reaches above 7Bar • Reinstall the limit valve • Replace the relief valve |
|
The oil cylinder has the phenomenon of pulling out the cylinder |
• Limit valve installation position is not correct • The lifting angle of the carriage is too small, and the rear overhang is too long • The cargo is a bulky object, and the lifting angle is too small |
• Readjust the installation position of the limit valve • Vehicle redesign installation • Adjust the lift angle to reach the maximum angle |
|
Cylinder barrel strain |
• Partial load • The clearance of the cylinder support is out of tolerance, and the installation of the cylinder is not vertical (left and right) • After the car is overturned, it will be generated after continuing to use • Uneven roadbed when unloading • Cylinder top nut loose • The gap between the cylinder trunnion and the bracket hole is too large (within 1 mm) • Driving when the oil cylinder is moving and lifting • When the oil cylinder is lifted, the cylinder barrel interferes with other parts and is damaged • Dirty hydraulic oil |
• load the goods correctly • Adjust bracket clearance • Replace damaged parts related to oil cylinder • Operate according to requirements • Tighten the nuts at the top of the cylinder according to the torque • Replace damaged parts • Operate according to requirements • Do a redesign install • Replace the hydraulic oil and replace the two filters |
|
Cylinders are lifted out of order |
• Deformation of the cylinder (overturned, impacted by external force on the cylinder, unloading by emergency brake, excessive system pressure) |
• Replace damaged parts |
|
Oil cylinder barrel oil leakage, oil leakage |
• Multiple eccentric loads • cylinder strain • The installation position of the oil cylinder does not meet the requirements |
• Correct loading, replacement of seal kit • Replace cylinder and seal kit • Replace the cylinder and readjust the cylinder position |
|
When the oil cylinder stops, there is a sliding phenomenon |
• valve in lift valve • Leakage in lift valve • Internal leakage of air control valve • Lift valve stem cannot be reset • There is oil leakage in the oil cylinder • oil pump damage |
• Replace check valve • Replace lift valve • Replace air control valve • Clean valve body, stem Replace seal kit • Replace damaged cylinder and seal kit • replace oil pump |
|
Cylinder does not drop |
• The valve stem and spool of the limit valve are faulty • Lift valve air chamber blowby • Cylinder barrel deformation • Gas line connection error • Deformation of the carriage or other parts • The air control valve is not ventilating • Lift system has no main air supply |
• Replace limit valve • Replace Lift Valve Seal Kit or Lift Valve • Replace the damaged parts of the oil cylinder • Check the layout or replace the gas pipeline • Modification of carriages or stabilizers • Replace air control valve • Check the main air circuit |
|
Cylinder shaking |
• oil pump damage • The fuel tank is short of fuel • Damaged power take- off • Fluctuation of tubing flow rate is too large • Deformation of the carriage or other parts • drive shaft problem |
• replace oil pump • Supplement the original hydraulic oil of the same type • Replace the power take-off • Check the oil circuit • Repair or rebuild deformed parts • Adjust or replace drive shaft |
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