1. The pump does not absorb oil, the flow rate is not enough, the pump is empty, and the pump is damaged.
Damaged pumps, damaged skates or damaged ski and column ball joint seals; swash plate wear; wear of plungers and cylinder bores; failure of variable mechanisms; Wear of the oil distribution pan or wear of the oil distribution end face of the cylinder block; The LS valve of the pump is worn, the pressure shut-off valve is worn, and the constant power valve is worn; Solution: Change the pump.
2. Judgment of the truth or falsehood of pressure.
There is actually pressure, but it is not displayed, the pressure gauge switch is not turned on, turn on the pressure gauge switch. A large number of pressure gauges do not show a lower pressure, and the change range is suitable for the pressure gauge. The pressure gauge is damaged, and the pressure gauge is replaced.
3. If the motor steering is not right, change the motor steering, the pump is not turned right, it cannot absorb oil, and the system has no pressure.
The motor is not steered correctly, and some hydraulic systems can cause damage to the pump. Therefore, before starting the new pump, the correct steering of the pump should be clarified, and the pump shaft should be climbed by hand to fill the suction pipe of the pump with oil; Between the inlet and outlet of the pump, a reverse short-circuit check valve with a suitable diameter is connected.
4. Oil absorption problem.
If the air filter of the mailbox is blocked, the air filter should be cleaned; There is a lot of air in the suction pipe of the pump, so make sure that the suction pipe is full of oil before starting; The pump oil suction oil filter is exposed to the liquid level, and the oil is added to the normal liquid level; The oil deteriorates, the viscosity is too large, the pump is emptied, and the oil should be changed. If the pump does not hold the oil, it will affect the system pressure; Pump evacuation is the main source of hazards in hydraulic systems. When the liquid pressure is lower than the air separation pressure, the air in the liquid separates out.
5. Large amount of leakage.
Excessive leakage of the pump, dirt or wear of the oil distribution surface, cleaning the pump or replacing the pump; If the pump leakage is too large, it can be seen from the oil drain pipe, and the pump should be cleaned or replaced; If the system leaks too much and may communicate the high and low voltage components, the leakage should be checked, cleaned, repaired or replaced. The flow rate of the pump cannot supply the leakage, the pressure cannot be established, the seal gap is worn, and the oil is dirty.
6. The control valve fails.
If the pressure of the pump pressure cut-off valve is too low, adjust the shut-off valve pressure; The LS valve of the pump is stuck in the low displacement of the pump, the LS valve should be cleaned, the pressure of the pump constant power valve is too low, and the spring of the constant power valve should be adjusted; The set pressure of the total safety valve of the system is too low. The pressure is set by three control valves on the load sensitive variable variable pump, the total safety valve is low and the pressure oil is mortgaged to overflow. The adjustment of the pressure valve is related to the pressure and the safety of the guarantee.
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2. When the system pressure increases, the flow demand decreases.
3. At this time, the safety valve is opened, so that the excess flow is returned to the oil tank to ensure the inlet pressure of the safety valve.
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Rexroth vane pump working principle and classification introduction
How Rexroth vane pumps work:
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Compared with ordinary hydraulic components, proportional valves have the following characteristics:
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Rexroth Pressure Reducing Valve Failure Analysis:
1. Air is mixed into the oil
2. The damping hole is sometimes clogged
3. The roundness of the hole between the slide valve and the valve body exceeds the regulations, so that the valve is stuck
4. The spring is deformed or stuck in the spool valve, making it difficult for the spool to move or the spring is too soft 5.
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1) Flow regulation
Port X is connected to the oil tank to relieve pressure, and port B is closed, and the pressure reaches the required pressure by rotating the adjusting screw on the FR of the flow control valve, and the general FR setting value is between 14 Bar and 22 Bar
2) Highest pressure regulation
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(1) The oil has a certain compressibility, resulting in noise, vibration and crawling of moving parts in the system.
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Rexroth hydraulic pump - how to use the piston pump
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2. Adjust the valves in the hydraulic system: The valves in the hydraulic system can control the flow and pressure.
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Rexroth Balancing Valve Installation Instructions
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