Precautions After Replacing the Hydraulic Pump in Construction Machinery

2017-02-16 927 0人评论
        Abnormal noise, vibration, or abnormal signals from the monitoring system must have their causes. Once an abnormal phenomenon is found, immediately consult the circuit diagram, trace the cause, and carefully observe whether the abnormality is caused by a temporary error. Assess whether shutdown is needed for handling. Factors such as pressure, load, temperature, time, startup, and shutdown all contain possible causes of abnormal phenomena. Analyze and discuss item by item during normal times.

(2) Do not apply load immediately after the hydraulic pump starts

After starting, the hydraulic pump must run without load for a period (about 10 to 30 minutes). Especially when the temperature is very low, a warm-up process is required to allow the hydraulic circuit to circulate normally before applying load, and confirm the operating condition.

(3) Observe oil temperature changes

Pay attention to checking the highest and lowest oil temperature changes, and determine the relationship between oil temperature and ambient temperature. Only then can you know whether the cooler capacity and reservoir capacity match the surrounding conditions and operating conditions, and have a basis for troubleshooting the cooling system.

(4) Pay attention to the noise of the hydraulic pump

A new hydraulic pump has less initial wear and is susceptible to air bubbles and dust. Poor lubrication at high temperatures or overloaded operating conditions can cause adverse consequences and make the hydraulic pump emit abnormal effects.

(5) Pay attention to checking the display values of instruments

Always observe the pressure gauge readings, pressure switch lights, and other vibration conditions and stability of the hydraulic circuit to detect whether the hydraulic circuit is functioning normally as early as possible.

(6) Pay attention to observing the mechanical action (for modified pumps)

Improper hydraulic circuit design or poor component manufacturing is not easily detected in the initial use stage, so special attention should be paid to the action states manifested under various operating conditions.

(7) Pay attention to adjustments within each valve

Fully understand the use of pressure control valves, flow control valves, and directional control valves. Pay special attention to the adjustment range and limits; otherwise, incorrect adjustments will not only damage the machine but also pose a threat to safety.

(8) Check the status of filters

Regularly remove and clean the filters in the circuit, check the condition of the filter screen and the contaminants adsorbed on it, and analyze the quality, quantity, and size. This way, you can observe the degree of contamination in the circuit and even infer the source of contamination.

(9) Regularly check changes in hydraulic oil

Every one or two months, check and analyze the deterioration, discoloration, and contamination degree of the hydraulic oil to ensure the normal operation of the hydraulic transmission medium.

(10) Pay attention to leakage in piping

Whether the hydraulic piping is good or not can be seen after a period of operation. Check for oil leakage and whether the piping is loose.

(11) Pay attention to the operating condition within the first three months of new machine operation

During the running-in period of a new machine, pay attention to checking the operating condition, such as maintenance of components, whether screws are loose, whether the oil temperature rises abnormally, whether the hydraulic oil deteriorates quickly, and check whether the operating conditions meet the regulations.

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