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Reasons for common problems in construction machinery construction in winter
Source: China Bearing Network Time: 2018-02-07
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.1) The thermostat failed. A YZ10B roller; after launching the diesel engine, it was found that the water tank had a “cooking†appearance in a short time. Checking the water tank of the water tank was very cold; clarifying that the cooling water was not completely circulated. After the thermostat; found that there is ice in the thermostat; so that the main valve can not be opened; incurs cooling water can not carry out large cycles; thus the engine water temperature rises too fast and presents a "cooking" appearance.
.2) Airway obstruction. A ZL50 loader; after starting, it is found that the air pressure indicated by the air pressure gauge has always been zero, when the air reservoir vent switch is turned over; no air is discharged, and the compressor is disconnected between the gas control valves. At the time of trachea; there is gas discharge; clarify that the operation of the pump is normal. Dismantle the gas control valve to the air pipe between the gas storage cylinders; find a small ice block at the junction of the copper gas pipe and the hose to block the gas pipe. Jia Wei (2) Glass ash tribute Zhai Yugan. In winter, the water vapor in the brake circuit is often frozen into ice after stopping; causing obstruction of the trachea; therefore, it is necessary to release the air reservoir after each stop; the moisture in the oil-water separator.
.3) The filter is blocked. A W4-60 excavator will be turned off shortly after starting; use a manual pump to pump oil; sweep the air in the fuel line; it will still turn off shortly after starting again. Check the fuel tank to the oil pump tubing and lose The oil pipe from the oil pump to the diesel filter; there is no obstruction; the diesel filter is removed; the filter element is found to be blocked by ice. The primary reason is that the machine is not sealed during the autumn; the original diesel is condensed. The point is higher; in the winter, the filter element is simply sealed due to the icing of the diesel in the filter. The illusion of the yak smashed the chlorinated 2. The sputum is sputum. The ice in the filter element is removed. When the diesel is replaced and the engine is started again; the diesel engine operation is normal.
.4) Hydraulic oil freezing. A ZL50 loader; found that the torque converter oil pressure (outlet pressure) is 0, the shifting operation oil pressure is 0. 5Mpa (normal value is 1. 08-1. 47Mpa) ); after the gear is locked, the machine can't walk in. Open the transmission filler cap; find that the hydraulic oil has frozen into ice slag (wax); then use the blowtorch to bake the transmission, filter and main oil pipeline; then start again The appearance shows normal pressure; the machine can travel normally.
.5) Diesel icing. A Shanghai 120A bulldozer; flashing out in a flat place. When pumping oil with a manual pump; as long as a small amount of oil flows out at the bleed screw of the fuel injection pump, check the diesel tank; the amount of oil is sufficient; However, there is ice slag (wax) in the diesel oil. Look at the pipeline from the diesel tank to the oil pump; it is found that the pipe is also in the ice slag; the oil activity is not good. The reason is; the original diesel tank is filled with 0# diesel. Make the machine appear icy when working in winter. After clearing the oil circuit and switching to low-condensation point diesel oil; the diesel engine operation is normal; no longer shows the appearance of flameout.
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