The hydraulic oil gas resistance caused by mechanical failure to solve       

The hydraulic oil in the hydraulic system can be divided into 4 categories: air resistance, solid material resistance, oil modification resistance, oil filter resistance. Knowing its internal and external characteristics can prevent misdiagnosis.

The external features of gas resistance fault are as follows:

(1) the air resistance is generated before the power plant pump, no action, slow action, the pump may have abnormal sound or pump heating.

(2) the air resistance is slow, unstable and shaking before and after the working device.

The main reasons for formation of gas resistance are: insufficient oil in the system, no exhaust and oil deterioration after repair or oil supplement.

Gas resistance fault is easily misdiagnosed as leakage fault and component hairpin fault. Gas resistance fault is easy to exclude, but often because of misdiagnosis and dismantle the should not be demolished. Change should not be replaced, resulting in laborious, cost of material, delay the construction period.

Such as: a TY220 type bulldozer, stop and then start to hang out. Preliminary judgment may be a power shift gearbox problem, the reason is: half a year ago the bulldozer had hung on the block phenomenon, and later found the failure is due to a screw oil power shift transmission within the block caused by loose. Analysis of the fault, that the transmission leak is impossible; dismantling of the transmission control valve group, the results are all normal. Later, in the data to see "working device hydraulic oil filter equipped with exhaust holes", which reminded the author, that is, the gas in the system produced gas resistance. The morning of the second day after the launch of the machine, unscrew the screw plug exhaust, is really a "gas" potential torrents. Exhaust gas, and then gear, all the gear can be hung successfully, stop after the start, everything is normal. In order to prevent similar failures, remember that after the oil change, filter or oil level is not enough to fill the oil, must exhaust.