Analysis of the heating causes of the loader hydraulic system

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1. Cause Analysis

(1) High working environment temperature

Continuous operation in hot summer, coupled with poor cooling effect or poor heat dissipation, causes the machine to generate more heat than the heat dissipation, causing the oil temperature to be too high.

(2) Long-term overload operation

The loader works continuously for a long time under high pressure and high power, and the overflow valve is frequently opened. The oil circuit and components in the hydraulic system heat up due to long-term high-pressure unloading.

(3) Hydraulic pump heating

The hydraulic pump is the main component that generates heat. The high speed of the hydraulic pump, high oil discharge pressure, harsh working environment, oil pollution, improper oil selection or too little oil can all cause pump damage and leakage. Leakage in the pump can increase its power loss and cause serious wear. After air enters the oil, it is easy to compress, which can cause dry grinding of the pump. Long-term leakage, dry grinding or severe compression in the hydraulic pump will inevitably generate heat, causing the oil temperature to rise and causing system heating.

Loader accessories

2. Failure examples

Accessories manufacturers learned that there was a phenomenon of weak shoveling and poor operation during operation. The high-pressure oil pipe felt hot when touched by hand, and it was initially determined that it was caused by the heating of the hydraulic system. The hydraulic pump was checked and the pump housing was found to be hot and noisy; when the hydraulic oil was checked, the oil was found to be deteriorated. Analysis showed that the hydraulic pump was likely to be heated due to oil contamination, so the hydraulic oil was replaced. When replacing, the oil pipe, oil tank and filter were cleaned first; a certain amount of oil was added to the system, and the cleaned oil was discharged after several cycles; finally, new hydraulic oil was added.

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