How to check if there is enough hydraulic oil in an excavator?

Inspection and measurement of excavator oil pressure

This article is provided by Seiko Excavator Repair Factory

1. Inspection of oil pressure

. For engines equipped with an oil pressure gauge on the driver's seat instrument panel, check

whether the pointer of the oil pressure gauge is within the green range during operation.

On the driver's seat instrument panel For engines equipped with an oil pressure warning light on the board, check whether the warning light lights up during operation.

★When starting, if the oil pressure does not rise (the oil does not reach various parts), it will run at high speed. , it will cause damage such as sintering.

★At startup, due to low oil temperature, high oil viscosity, and excessive oil pressure, the pressure warning light or the oil filter warning light will light up. situation.

In this case, the speed should be reduced and the engine should be preheated until the oil pressure and warning light enter the normal operating range.

2. Measurement of oil pressure

. The installation and removal of the oil pressure gauge should be carried out after the engine has stopped running.

. For engines with an oil pressure gauge on the driver's seat dashboard, remove the oil pressure and take out the cable. , connect the oil pressure gauge (2) for measurement with a pipe joint, hose (1), etc., and measure the oil pressure.

★The oil pressure gauge on the driver's seat dashboard often does not have a numerical scale or the scale is not precise. . Therefore, to measure the correct oil pressure value, it is necessary to use a measuring oil pressure gauge.

. When the engine does not have an oil pressure gauge installed on the driver's seat dashboard, the cylinder block and filter must be disassembled. Remove the outlet plug from the oil pressure in the oil filler bracket, connect the oil pressure gauge for measurement, and measure the oil pressure.

★ Install the oil pressure gauge so that it is not affected by engine vibration as much as possible. .

★Oil pressure changes due to the temperature of the oil. Therefore, the oil temperature must be measured after sufficient engine preheating operation

3. Treatment of abnormal oil pressure

1) When the oil pressure is too high

①The oil pressure gauge is defective

②Oil other than specified is used

③In the oil Measurement when the temperature is low

④ It may be caused by poor adjustment or poor operation of the oil regulating valve, so it should be checked and repaired.

2) When the oil pressure is too low

. When the oil pressure is too low, it may cause serious losses such as engine sintering. Therefore, the fault diagnosis of "insufficient oil pressure" should be made and the cause of the fault should be eliminated.

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Measurement of excavator oil temperature

. When measuring the oil temperature, connect the thermistor thermometer sensor

(1) from the oil supply port or oil level gauge. Put the guide port into the oil pan and measure with the thermistor thermometer (2).

★If the sensor is made of polytetrafluoroethylene, wrap the metal wire around a stick. Place the tip at the L scale position.

If there is no thermistor thermometer, use a rod thermometer.

★In order to prevent the thermometer from being damaged, it is necessary to Put the rubber tube on the tip.

★The engine oil temperature is closely related to the engine cooling water temperature, and generally changes as shown on the right.

★Engine After starting, do not increase the speed or load when the engine is not hot.

★The general criterion for whether the engine is hot is whether the water temperature reaches the valve opening temperature of the thermostat.

★When it is not necessary to measure the engine oil temperature particularly precisely, a rough estimate can be made from the correlation with the water temperature, or by touching the oil pan or cylinder block with your hands.

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