Bulldozer unable to trouble-shooting work
Thursday, December 10th, 2009A PD220-type , in the process of bulldozing roadbed earthwork weak. The site inspection revealed that the normal engine power, transmission and torque converter than the dirty filter, hydraulic oil deterioration, it is estimated that the resulting failures. Therefore, they removed a magnetic coarse filter cleaning, filter and oil filter 3 in the hydraulic oil and transmission replaced along with, but the are unable to work a few hours later.
As the mechanic at the scene this failure can not be ruled out, then the machine will be shipped back to the company machine repair shop for repairs. I measured from the C transmission clutch pressure 2.0MP (normal pressure should be 2.5MPa), due to low pressure, variable-speed pump subsequently suspected of serious wear and tear, reaching less than a rated pumping pressure. In the new variable-speed pump replaced after the re-test machine and found that bulldozers are still weak. Therefore suspected to be due to wear and tear caused by the core Pressure Regulating Valve with lower pressure. In the relief valve were opened, we found in the inlet Department has two rubber pads stuck to spool so that the relief valve does not work, therefore can not ensure that all gear clutch engagement, resulting in earth-moving weak. After the rubber pad cleared, bulldozers working back to normal.
In analyzing the sources of rubber pad in the oil filter also found inside the three have the same rubber pad, but also with relief valve mouth of the rubber pad can be makes up a complete gasket to prove that the rubber gasket from the old entered on the aging filter off the oil Road. This reminds machine repair personnel, that is, when the repair operations must carefully check and not allow damage to residual material falls on the body.
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