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Why is it difficult to start the hydraulic system in a cold environment? What are the countermeasures?

2025-04-28

The main reasons why low temperature causes difficulty in starting the hydraulic system are: the viscosity of the oil increases sharply, which increases the oil suction resistance of the axial piston pump and may cause cavitation. The seals harden, the initial friction resistance increases, and especially the cylinder starting pressure increases significantly. The battery capacity decreases and the motor starting torque is insufficient. Countermeasures include: choosing low freezing point hydraulic oil, such as HV or HS series, with a viscosity index higher than 150. Install an oil heater and preheat the oil to above 15°C before starting. Consider installing fuel tank insulation for equipment in cold regions. When starting, run the machine without load for a few minutes to allow the oil to circulate and heat up. Strengthen battery maintenance and use auxiliary starting power when necessary. For extreme environments, consider glycol-water hydraulic systems. For equipment that is out of use for a long time, the oil should be drained and stored, and replaced with new oil before use.

Rexroth Piston Pump

Rexroth Piston Motor

Rexroth Axial Piston Pump

Rexroth Axial Piston Motor

Hydraulic Axial Piston Pump

Construction Machinery Piston Pump

Construction Machinery Piston Motor

Industrial Machinery Piston Pump

Agricultural Axial Piston Motor

Harvesting Machinery Piston Pump

Harvester Axial Piston Motor

Bent Axis Piston Motor

Variable Axial Piston Pump

Fixed Displacement Piston Motor

Hydropower Plant Hydraulic Cylinder

Water Conservancy Hydraulic Cylinder

Rexroth Piston Pump

Rexroth Piston Motor

Rexroth Axial Piston Pump

Rexroth Axial Piston Motor

Hydraulic Axial Piston Pump

Construction Machinery Piston Pump

Construction Machinery Piston Motor

Industrial Machinery Piston Pump

Agricultural Axial Piston Motor

Harvesting Machinery Piston Pump

Harvester Axial Piston Motor

Bent Axis Piston Motor

Variable Axial Piston Pump

Fixed Displacement Piston Motor

Hydropower Plant Hydraulic Cylinder

Water Conservancy Hydraulic Cylinder

Why is it difficult to start the hydraulic system in a cold environment? What are the countermeasures?

Why is it difficult to start the hydraulic system in a cold environment? What are the countermeasures?