The oil tank has a small volume and insufficient heat dissipation area. There is no oil temperature cooling device installed or, even if there is one, its capacity is too small.
When the volumetric pump supply system selects the oil pump capacity at a fast feed rate, most of the flow is under high pressure, which causes overheating through overflow valves.
The unload circuit in the system has failed, or no load return circuit is set. When stopping work, the oil pump cannot unload properly, and the entire flow of the pump overflows under high pressure, causing overflow losses and overheating of the equipment.
The system pipeline is too narrow, too long, and bends too much, leading to significant local and along-the-way pressure losses.
The precision of components is insufficient, and the equipment quality is poor, resulting in higher friction and mechanical losses during relative motion.
Clearance between mating parts is too small or too large due to wear, resulting in large internal and external leaks and significant volume losses. For example, a reduction in pump volumetric efficiency causes rapid temperature increase.
The working pressure of the hydraulic system is adjusted much higher than actually required, sometimes due to too tight sealing or damaged sealing components, resulting in increased leakage and a need to adjust the pressure higher to work properly.
