What is the speed switching circuit? The general function of the speed switching circuit is to change the hydraulic actuator from one movement speed to another movement speed in a working cycle. Therefore, this conversion includes not only the slow speed conversion but also two This kind of slow direct connection; this article Merritt tells the case of the Cat 315 excavator's weak maintenance action.
Details: A Carter 315 excavator, which works on the construction site in the morning, the three major parts have not been moved, the original chain, the pump has abnormal noise before the recent operation, the tubing is shaking, and the movement is weak
Cause Analysis:
It may be that after the copper sleeve in the body of the Caterpillar excavator is broken, the wear gap between the plunger and the cylinder body is large, and the amount of hydraulic oil leakage is too large, which causes the pressure of the front pump to fluctuate, causing the tubing of the Caterpillar 315 excavator to shake.
Repair process:
Carter excavator's weak front pump causes abnormal noise first
First check the hydraulic oil level of the excavator, there is no shortage of oil; check the oil, no deterioration.
Then check the hydraulic oil return filter element of the excavator and found a small amount of copper scraps. The analysis may be that the problem with the hydraulic pump of the Caterpillar 315360 excavator caused the abnormal noise of the front pump and the failure of the action.
Then check the surrounding parts of the front pump of the Carter 315 excavator, there is no sign of loosening.
Finally disintegrated the main pump of the Carter 315 excavator and found that the copper sleeve in the front pump cylinder was broken 2.
Maintenance method:
Replace the damaged plunger and cylinder of the excavator, restart the test run, the excavator works normally, and the fault is resolved.
