Detection of 1. unloading oil pressure
The engine is running at high speed to measure the hydraulic pressure of all joysticks in the middle position.
2. installation of oil pressure test meter
(1) remove the pressure plug (diameter lOmm, P=1.25ram) from the tested loop and install the oil pressure test table.
(58. 8MPa).
(2) put the safety of the device on the ground, then turn the engine out, release the oil filler cap and release the hydraulic tank.
The pressure is then placed in the locking position of the safety locking lever.
Detection of overflow pressure of 3. main pump
(L) low pressure setting (oil pressure is 31. 9MPa): high speed idling of engine, except working device.
When both overflow, the oil pressure is measured. However, the setting pressure of the top safety valve of the rotary motor and the boom cylinder is lower than the set primary overflow.
The pressure is measured, so the measured value is the relief pressure of the relief valve.
The rotary overflow pressure should be measured when the rotary lock switch is placed at ON.
(2) high pressure setting (oil pressure is 34. 8MPa (355kg/cm2)): when walking, the engine is running at high speed.
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Measure the oil pressure on each side of the overflow. The test conditions are: placing blocks on the track teeth or driving wheels and crawler frames.
A cushion block is arranged between the tracks to lock the track and overflow the running circuit.
(three) detection of output pressure of PC valve (input pressure of servo piston)
2. detection of oil pressure
(L) the engine runs at high speed to measure the oil pressure when the bucket rod is recovered.
(2) check whether the input pressure of servo piston is about 1/2 of the output pressure of the main pump.
(3) if the LS valve or servo piston is abnormal, the input pressure of the servo piston will be in phase with the output pressure of the main pump.
The same or zero.
(four) detection of LS valve output pressure (servo piston pressure) and LS valve differential pressure.
1. installation of oil pressure test meter
(L) unload the pressure gauge and install the oil piezometer.
(2) install a 39. 2MPa pressure gauge on the servo valve side and install 58. 8MPa pressure at the outlet side of the main pump.
The table.
Detection of 2.LS valve output pressure (servo piston pressure)
(L) unload the pressure gauge and install the oil piezometer. Install the 39. 2MPa pressure gauge on the servo valve side and output the oil at the main pump.
A pressure gauge of 58. 8MPa is installed on the side of the mouth.
(2) the oil pressure of the single side walking motor. The A. uses a working device to support the track assembly on one side.
The B. engine is running at high speed. The output pressure of the main pump and the input pressure of the servo piston are measured according to table 3-10.
C. measure the oil pressure of the front pump and measure the oil pressure of the rear pump.
Detection of pressure difference of 2.LS valve
(L) test by differential pressure meter:
1. Unload the pressure plug and install C3 on the hose.
(2) installing the differential pressure meter C4 in the front pump circuit
Table 3-10 LS valve output pressure detection
In the following respects
The pressure of the oil pump and the piston pressure of the servo piston.
Walking operation lever note
MPa (MPa)
In the following respects
The median position is 3.7 + 0.7, 3.7 + 0.7, and the pressure is approximately the same.
In the following respects
Half stroke, 6.9 + l.0, 3.4 + l.0, about 1/2 of the main pump pressure.
In the following respects
