How to maintain the hydraulic oil of special purpose vehicle

With more and more functions of special vehicles, most of them are driven by hydraulic systems. Special vehicles with hydraulic functions such as garbage trucks, high-altitude working vehicles, guardrail cleaning vehicles and other models. The hydraulic system consists of hydraulic oil pump, oil pipe, hydraulic oil tank, hydraulic oil, oil cylinder, multiway valve, pressure gauge, pipe clamp and so on.

This kind of special vehicle with hydraulic function should pay attention to maintenance in winter, mainly to prevent the filling of the wrong label hydraulic oil in the hydraulic tank or forget to replace the antifreeze hydraulic oil, once the wrong hydraulic oil or forget to replace the correct label antifreeze hydraulic oil will lead to the special function of the vehicle can not move.

Different seasons to use or replace different labels of hydraulic oil and oil, normal temperature, the use of 46# hydraulic oil, winter below zero weather to use 32# antifreeze hydraulic oil, to correspond to the correct label to replace below zero hydraulic oil: 5W resistance to external low temperature -30℃, 10W resistance to external low temperature -25℃, 15W resistance to external low temperature -20℃, 20W resistance to external low temperature -15℃. For example: 5W-40 oil is applicable to the external temperature range from -30℃ to 40℃, and 10W-30 oil is applicable to the external temperature range from -25℃ to 30℃, obviously the heat and cold resistance of 5W-40 oil is better than 10W-30 oil.
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High-altitude operation car oil change guideline:

A. Exhaust the oil in the oil and gas separator, the vacuum pump idling for more than ten seconds and exhaust the oil in the vacuum pump, clean the oil and gas separator.

B. Clean the oil and gas separator to the vacuum pump return tubing.

C. Clean the oil return connector of the vacuum pump.

D. Check valve oil directly into the vacuum pump.

E. Fill oil in oil and gas separator.

F. Clean the water and gas separator.

G. Block the exhaust pipe of the four-way valve and reverse pressure the oil in the oil and gas separator into the vacuum pump.

H. The pressure of vacuum gauge can be below 0.07. The vacuum pump has no abnormal sound, and the oil change is normal.

Correct use and replacement of hydraulic oil:

A. Use different labels of hydraulic oil and oil in different seasons, use 46# hydraulic oil at normal temperature, use 32# hydraulic oil in winter below zero weather, to replace below zero hydraulic oil corresponding to the correct label: 5W resistance to external low temperature -30°, 10W resistance to external low temperature -25°, 15W resistance to external low temperature -20°, 20W resistance to external low temperature -15°.

For example, 5W-40 oil is suitable for the external temperature range from -30° to 40°; The 10W-30 oil is suitable for the external temperature range of -25° to 30°. Obviously, the heat and cold resistance of 5W-40 is better than 10W-30.

B. For vehicles equipped with water circulation sewage pumps, the cooling water should be discharged cleanly in winter and replaced with antifreeze. In sub-zero weather, the oil in the oil and gas separator should be replaced with sub-zero diesel oil in the sewage suction and sewage suction vehicles equipped with vacuum pumps.

The hydraulic oil of the special vehicle is generally loaded to two thirds of the hydraulic tank, and will not leak when pressurized, and the pressure is large.