What is the situation when the loader has normal pressure but the vehicle does not move?
3 Answers
If the loader has normal pressure but the vehicle does not move, it is likely due to aging of the travel pump or issues with the transmission oil. Professional inspection and repair should be conducted as soon as possible to resolve the fault. Below is a relevant introduction to loaders: Definition: A loader is a type of earth-moving machinery widely used in construction projects such as highways, railways, buildings, hydropower, ports, and mines. It is mainly used for shoveling and loading loose materials like soil, sand, gravel, lime, and coal, and can also perform light digging operations on ores and hard soil. Function: By equipping different auxiliary working devices, it can also perform tasks such as bulldozing, lifting, and handling other materials like timber.
With over two decades of operating construction machinery, I've encountered numerous instances where loaders wouldn't move despite normal pressure gauge readings. This often stems from transmission issues—clutch slippage or critically low oil levels can disrupt power transfer, even when hydraulic pressure appears adequate, indicating potential internal wear. Brake system seizures are another frequent culprit, whether due to an engaged parking brake or rusted wheel cylinders, especially prone after rainfall when rust can lock wheels. Drive component failures like broken rear axle gears or loose chains also immobilize equipment. I recall one job where torque converter seal leakage showed full pressure yet rendered movement impossible, forcing shutdown for repairs. Sandy soil operations demand extra vigilance against foreign object intrusion into components. Safety always comes first—when facing such malfunctions, immediately shut down for inspection rather than forcing operation and exacerbating damage. Regular lubrication of brake linkages during maintenance prevents many headaches, avoiding costly repairs down the road.
As a beginner operating a loader, I once encountered the awkward situation where the pressure was normal but the vehicle wouldn't move. At first, I was completely baffled. Later, I learned that the most common causes are forgetting to release the handbrake or the brake pedal not fully returning, which completely locks the wheels. Sticking in the transmission shift mechanism can also lead to power interruption, such as moving the gear lever before it's properly engaged. Other situations like a broken drive shaft or tires slipping on the ground (soft soil or mud can be mistaken for immobility) can make the pressure seem fine while the vehicle remains stationary. The master taught me to first listen for mechanical noises—unusual sounds might indicate damaged parts. During operation, pay attention to the control handle's position and reset it if necessary, and try fine-tuning the hydraulic valve if needed. But don't take risks by forcing it; instead, park in an open area and contact the repair station to check parts like the hydraulic motor to prevent minor issues from turning into major hazards.
