Excavator with fuel oil is diesel, not gasoline. Hydraulic oil is high viscosity (more than 120ls) anti-wear hydraulic oil, used for pin lubrication general general lithium grease can be, that is, Kunlun of a barrel of butter. Excavator is fully hydraulic transmission, no transmission reducer this thing, the lubricant can be exempt, pumps and valves and motors, rotary reducer, etc. are directly lubricated with hydraulic oil.

Agricultural small excavator

For excavators such as heavy-duty and long-term work of construction machinery, the use of diesel engines is necessary. Because of the low cost of diesel engines, fuel-efficient, high power, low-speed torque, torque adaptability (power curve than gasoline engine stable). First of all, fuel saving is the first, huh seen how some engineering teams with excavators, right? When the work is busy to change people do not change the machine, people stop non-stop, if the use of low calorific value of gasoline, then buy oil must buy poor. Excavator as the harsh conditions of the use of construction machinery, to be reliable, to be stable. To put it bluntly is to “operate”, oh, I guess you know from common sense, diesel engines than gasoline engines more than operation.

Diesel engine speed is low, less wear, low heat load, and basically cast iron body, quite solid, large volume of space, cooling water channels lube oil channels are easy to arrange, unlike the gasoline engine is so small, but also cast aluminum and even magnesium-aluminum alloy what to come, even if the process is good, the process is poor is not resistant to burning; diesel oil pipeline injection nozzle diameter of what are relatively large, not easy to plug, and no gasoline engine what easy to Erosion of the spark plug, easy to break the distributor and a large number of ECU electronic control system, electronic systems with more, stability is not.

At the same time there is another reason is that the gasoline engine as a high-speed heat engine, not quite meet the needs of the excavator conventional constant power control system. Medium and large excavators in the “standard” (S) and “fast (F)” mode of work, the use of variable control system, so that the diesel engine fixed speed in the rated power speed (lower speed) stable work, this speed to save fuel, and this working condition has a certain This speed is fuel-efficient and has some advantages similar to stepper motor, that is, the output torque changes without much change in speed. It makes the excavator work steadily, and the digging force is determined by the load (digging to soft soil and minus digging force increase speed, digging to cement stone and plus digging force decrease speed), while the engine works at constant rated power and speed. Gasoline engine response to the load is more sensitive than diesel engines, high speed, but heavy-duty is not good, resistance to a slight increase in speed drop a lot, in addition to fuel consumption this shortcoming, but also make the control complex, working conditions change more, with the pump swash plate to adjust the output at the same time, but also constantly refueling and fuel reduction to maintain a constant speed, too complicated but fuel-saving effect is not good. And let the gasoline engine in the “heavy-duty” (H) mode of work, obviously is not wise, it provides limited torque, and fuel consumption increased sharply.