The excavator is slow and weak, and the oil temperature rises especially fast

[DIG-DOG]

excavator action is slow, the oil temperature rise is particularly fast, these two kinds of fault phenomena are gathered on a excavator , basically declared to stop repair! Recently, when a user's small excavator was running at idle speed of the engine, the control lifting arm and the extender rod mechanism did not move, and the bucket could move slightly but very slowly.

When the idle speed is abnormal, the owner raises the engine speed to the working speed of 1750 RPM, and operates these mechanisms, although there is action, it is very slow and weak, and at the same time, it is also found that the hydraulic oil temperature rises quickly. The following will be the entire fault analysis, maintenance process to share with you.

The excavator is slow and weak, and the oil temperature rises especially fast.

First of all, the actuator action is slow and weak, which can be analyzed as a result of low main pressure. There are several reasons for low stress:

1. Blockage of oil filter element causes poor oil absorption of hydraulic pump.

2, hydraulic pump internal components wear seriously caused internal leakage.

3, the system main relief valve pressure regulation is low or serious internal leakage.

4, the hydraulic oil has been seriously deteriorated.

Ishikawa Island small digging slow weak, oil temperature rise especially fast troubleshooting:

1, we first hang up the main pressure gauge and pilot pressure gauge, start the engine, put down the safety lock, the measured pilot pressure is 0.8MP, lift the engine to the working speed control boom and bucket rod, and use the pressure gauge to measure the oil pressure: the pilot oil pressure is 1.8MPa, the system working pressure is 13MPa. This phenomenon may be caused by the simultaneous failure of the main relief valve and the pilot relief valve.

2, after adjusting the main relief valve and pilot relief valve, the pressure does not change, disassemble the relief valve and there is no wear and break the card, and eliminate the failure of the main relief valve and pilot relief valve.

3. Open the hydraulic oil tank and find that the hydraulic oil color is dark, and there are metal filings and powder mixed in it. Such an obvious anomaly basically determines that there is wear inside the hydraulic pump.

4, the hydraulic pump decomposition found that the pilot rotor pump wear serious, pump body contact surface has obvious strain phenomenon; The plunger, pump body and valve plate of the plunger pump have different degrees of wear, and the tile of the swash plate has also worn out the groove.

Because the internal parts of the hydraulic pump are too damaged, it is recommended that the customer replace the assembly. Replace the new hydraulic pump assembly and replace the new hydraulic oil and filter element.

5. In order to ensure the cleanliness of hydraulic oil, the hydraulic tubing, oil tank and control valve were cleaned at the same time. Then start the machine for operation test, the pilot pressure reached 3.5MP, the main pressure also reached 24.5MP, all parameters reached the normal state, the hydraulic oil temperature no longer rose sharply.

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