Five Major Questions about Maintenance Experience of Excavator Parts_News

Five Major Questions about Maintenance Experience of Excavator Parts

Time： 2023-03-08

Five Major Questions about Maintenance Experience of Excavator Parts

1. What is the difference between engine preheating and automatic preheating?

Answer: The condition for engine preheating is: when the coolant temperature is lower than 10°C, the glow plug is automatically heated by the QOS controller. When the key switch is ON, the preheating time is 20 seconds, and the preheating indicator light is on for 8 seconds. After the warm-up is completed, when the key switch is at START, the engine will continue to warm-up for 30 seconds.

The conditions for automatic preheating are: when the hydraulic oil is lower than 0°C, start the engine, the hydraulic oil temperature sensor transmits an electrical signal to the MC, and the MC drives the EC motor to run at the target speed of 1250rpm, and the running time is 15 minutes or the hydraulic oil temperature When the temperature rises above 2°C, the automatic preheating will be released.

2. The role of turbocharger and intercooler?

Answer: The main function of the turbocharger is to increase the output power of the engine with the same displacement, improve the combustion effect, increase the mechanical efficiency, reduce the fuel consumption rate, improve the mixing effect, provide the air-fuel ratio, and reduce the emission of harmful gases. emission, improve low-speed performance, and meet the characteristics of the engine to make high torque at low speed.

The function of the intercooler is that the temperature of the air inhaled by the turbocharger will increase after being compressed, and the air will further heat up when it rubs against the wall of the intake pipe during the flow process, which will affect the charging efficiency. The intercooler is like a radiator. The heat of the air is dissipated into the atmosphere through it, and lowering the temperature can also increase the air intake density, further increasing the effective power of the engine.

3. Adjustment of track tension in different working conditions?

Answer: On flat and firm roads, the track should be adjusted slightly tight; on rocky and uneven roads, the track should be adjusted slightly loose; on soft roads, the track should be adjusted slightly loose.

4. How to explain the black smoke coming out of the muffler when the machine is accelerating or decelerating or the load changes?

Answer: After adding the intercooler, the intake passage becomes longer and the intake resistance increases. When the machine is accelerating or decelerating or the load changes, the engine governor will increase or decrease the fuel supply, thereby destroying the original air-fuel ratio, resulting in puffs of black smoke in an instant. This phenomenon is normal.

5. Some precautions to avoid the machine from tipping over?

Answer: It is forbidden to rotate the stick at full extension when the shovel is full; prevent the machine from subsidence when working on soft soil; avoid the machine from hoisting and walking; avoid tipping when the machine climbs a steep slope; avoid tipping when turning on a slope; avoid tipping when the trailer is loaded .

Five Major Questions about Maintenance Experience of Excavator Parts

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