A: Lengthened arm excavator leasing purpose: to guide the pump truck hydraulic system pumping, commutation, mixing and cleaning pressure regulation.
B: Usage: Suitable for all kinds of pump trucks.
C: Adjustment steps:
1. According to the requirements of "Pump Truck Debugging Procedure", "Prepare" and "Start-up" work.
2: Loosen the regulating screw of all relief valves on the main block and auxiliary block.
3: All pressure adjustments are under close control.
4: Commutation pressure regulation:
1. Set the engine speed to 1750+100 rpm, then slowly depress the pressure.
2: Observe the reversing pressure gauge, slowly tighten the adjusting screw of the reversing relief valve on the auxiliary valve block, set the reversing pressure of the ordinary pump truck to 16 Mpa, then lock the adjusting screw, and adjust the boom damper pump truck to 18 MPa.
3: Reduce engine speed to idle speed, observe the reversing pressure gauge, the maximum requirement is 13 Mpa, the minimum is not allowed to drop to zero (that is, the pressure is lower than the accumulator); if not, the machine must be shut down to find out the reason.
Extended arm excavator
5: Stirring pressure regulation:
1:Turn the engine speed to 1750+100 rpmrpm and close the ball valve of the stirring motor inlet. At this time, the pressure gauge shows the pressure of the mixing system.
2: Tongling long arm excavator lease check the setting pressure of hybrid reverse pressure relay, slowly tighten the adjusting screw of the mixed pressure relief valve of auxiliary valve block, stir about 11.2 Mpa pressure switch, and the stirring blade should reverse the trend of hybrid reversing solenoid valve (or worthy of electric power). If it does not meet the requirements, then adjust the pressure of the mixed reverse pressure relay. Make it meet the requirements.
3. Pull down the stirring reversal solenoid valve and set the stirring pressure to 12 Mpa.
4: Open the ball valve of the stirring motor and install the plug of the anti-stirring solenoid valve.
6: Washing pressure regulation:
1: According to the requirements of "Technical Regulations for Pump Truck Debugging", oil of corresponding capacity is added to the pump shell, and the pump motor is discharged before adjusting the washing pressure.
2: Adjust the engine speed to 1750 rpm, close the ball valve of the pump motor and press the "cleaning" button. At this time, the pressure of the pump motor is displayed on the stirring pressure gauge.
3:观察搅拌压力表，慢慢拧紧辅助阀块上泵电机压力溢流阀的调节螺丝，将泵电机的压力分别设置为4Mpa (ql-80型离心泵)和8MPa (7560C型)，然后锁紧调节杆。
3: Observe the stirring pressure gauge, tighten the adjusting screw of the pressure relief valve of the pump motor on the auxiliary valve block slowly, set the pressure of the pump motor to 4 Mpa (ql-80 centrifugal pump) and 8 MPa (7560C type), respectively, and then lock the adjusting rod.
7: Adjust the overflow pressure of the main relief valve and the main oil pump pressure:
1: After adjusting the reversing pressure of the main relief valve and the main oil pump, then adjusting the pressure of the main relief valve and the main oil pump.
2: Tighten the regulator rod D on the main oil pump.
3:Turn the engine speed to 1750+100 rpmrpm, press the back button to observe the pressure gauge of the main system, tighten the regulating screw of the main relief valve slowly, and lock the regulating rod after adjusting the pressure of the main system to 34+0.5 mpa.
4: Tongling Long Arm Excavator Leasing Company observed the pressure gauge of the main system of single main oil pump, slowly unscrewed the pressure regulating rod D on the single main oil pump, set the pressure of the main system to 32+0.5 mpa, and locked the pressure regulating rod.
5: For double main oil pump truck, two main oil pumps are connected with pressure gauges respectively. First, pull out the electric proportional valve plug of the second oil pump, slowly loosen the regulator rod D on the first main oil pump, and set the pressure of the main system at 32 + 0.5 mpa, then lock the regulator rod. The plug of the electric proportional valve is inserted into the second oil pump. The first oil pump is pulled out of the electric proportional plug. The second main oil pump of the pressure regulating rod D is slowly relaxed. The pressure of the main system is set at 32 +0.5 MPA with the locked regulating rod.
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