Excavator pilot pressure test and pilot relief valve adjustment method

Excavator powerless people often think that the test pressure is normal, but the pilot pressure can not be read in the digging machine service diagnosis, then how to test the pilot pressure and P1P2 pump pressure?

Hydraulic pressure test preparation

\

Test equipment 1MPa pressure gauge 1 set, 50MPa pressure gauge 2 sets.

Determine the cleanliness of the hydraulic oil, the hydraulic oil must be replaced in time to ensure accurate measurement.

Install the position of the pressure gauge

\

As shown in the figure above, after the pressure in the hydraulic system and the fuel tank is released, the main pump has two plugs at a1 and a2, which are replaced with a plug PF1/4 for measuring pressure, and connected to a 50 MPa pressure gauge.

\

The position of the pilot relief valve is shown in the figure. The a3 plug on the gear pump is replaced with the pressure measuring plug PF1/4. After replacement, the pressure gauge of 7 MPa is connected. The pilot relief valve PRI is located above the gear pump connected to the main pump.

Overflow valve position and adjustment steps

Main relief valve adjustment

\

As shown in the figure, the number of turns of the adjusting screw is determined according to the pressure change, and generally one rotation is about 2.1 MPa.

The main relief valve adjusts the speed of the screw to determine the adjustment condition according to the pressure change. Under normal circumstances, the pressure side and the standard side adjustment screw rotate about 1 lap.

Adjustment of overload relief valve

Boom, bucket, arm section

\

\

As shown in the figure above, loosen the lock nut and adjust it with the adjusting screw. The rotation is about 8 MPa.

Rotating part

\

Although there is a pressure measuring plug in the rotary motor, it is measured at the pressure test ports a1, a2 of the pump. When the pressure needs to be adjusted, loosen the lock nut and adjust it to about 10 MPa.

Walking part

The overload relief valve (walking) has been adjusted by the manufacturer before shipment. It is not recommended to adjust it by yourself. Do not replace parts other than the O-ring. Because it is necessary to refer to the walking speed, walking offset, stopping braking performance and other related parameters to determine within the standard range.

The flat die pellet machine uses electrical motor as the power source. With gear drive instead of belt drive which can increase the efficiency to 20%. After being extruded through the die hole by the pinch roller. The length of the pellet can be adjusted by changing the blades size. Animal Feed Pellet Machine widely used in animal husbandry and aquaculture, large/medium/small scale poultry feed plant.This type of machine is specially used for making animal feed pellet for chicken, pig, rabbit, duck, goose, sheep, cattle, horse, deer, livestock etc.

Chicken Feed Pellet Machine

Chicken Feed Pellet Machine,Chicken Feed Pellet Mill,Animal Feed Pellet Maker,Small Animal Feed Pellet Mill

Shandong Kingoro Machinery Co., Ltd , https://www.kingoromachinery.com