Rexroth Hydraulic A4VG56 Piston Pump A4VG40 A4VG71 A4VG125 A4VG180
A4VG250
Product Descriptio
| SPECIFIION | 28/40/56/71/90/125/180/250 |
| WORKING PRESSURE | Nominal pressure40MPa,Peak Pressure 45MPa |
| CONTROL METHOD | Type NV, without controls
DG-hydraulic control, direct control
EZ-Electrical two-point control, with switch electromagnet
HD - Hydraulic control, related to pilot pressure
HW - hydraulic control, mechanical servo
EP-electrical control with proportional solenoid
DA - hydraulic control, related to deceleration |
| CHARACTERISTIC | ◆Swashplate type axial piston variable displacement pump for closed
circuit hydrostatic transmission
◆The flow is proportional to the driving speed and displacement and
can be infinitely variable;
◆The flow rate increases from zero to its maximum value with the
swash plate swing angle;
◆Swing the swash plate over the neutral position can smoothly
change the flow direction of the liquid;
◆Multiple variable modes that are easy to match with various
control and regulation systems;
◆The pump is equipped with two relief valves on the high pressure
oil side to protect the hydrostatic transmission (pump and motor)
from overloading;
◆The high pressure relief valve also has the function of oil
filling valve;
◆Built-in auxiliary pump is used as charge pump and control pump;
◆The maximum charging pressure is limited by a built-in charging
relief valve;
◆Full series with built-in pressure shut-off valve; |
Maintenance
1. Regularly replace hydraulic oil: Hydraulic oil is an important
part of the hydraulic system. It is very important to regularly
replace and maintain the cleanness and proper viscosity of the
hydraulic oil. Regularly check and replace hydraulic oil according
to the excavator manufacturer's recommendations, ensuring you are
using the correct specifiion and brand.
2. Regularly check the quality of the oil: Regularly check the
quality of the hydraulic oil, including checking for moisture,
impurities and contaminants. Use appropriate oil filters and oil
analyzers to ensure the quality of your hydraulic oil is up to
standard.
3. Check the seals of the hydraulic pump: The seals of the
hydraulic pump (such as O-rings, sealing rings, etc.) may be worn
or damaged during operation, causing hydraulic leakage. Regularly
inspect and replace hydraulic pump seals to ensure good sealing
performance.
4. Check the filter element of the hydraulic pump: The filter
element of the hydraulic pump is used to filter impurities and
particles in the hydraulic oil. Regularly check and replace the
filter element of the hydraulic pump to ensure normal hydraulic oil
flow and protect the hydraulic pump.
5. Pay attention to the temperature of the hydraulic pump:
Overheating of the hydraulic pump may affect its performance and
life. Ensure that the cooling system of the hydraulic pump operates
properly and avoid excessive operating temperatures.
6. Regularly check the vibration and noise of the hydraulic pump:
Abnormal vibration and noise may indie problems with the hydraulic
pump. Regularly check the vibration and noise of the hydraulic pump
and deal with any abnormalities in a timely manner.
About Xinfeng Machinery (XF) parts:
Advantages
Warehouse Display
Packaging and Delivery
FAQ
1. How to quickly and accurately buy products what lneeded?
A: Provide the original parts number to us to check.
2. How long have you been in the excavator
A: We are engaged in excavator parts since 1998
3. lfI don't know the part number,what shouldI do?
A: Please send us size and pictures of old products.
4. What is the warranty of the products?
A: The warranty is 6/12 Months based on the specific product.
5. How long is your delivery time?
A: The normal delivery time is 3-5 days for stock sproductsafter
getting payment. lf not in stock, we will inform you thetime
requlred.
6. Which shipping term you can supply?
A: By sea,air or by express ( DHL,Fedex,TNT,UPSEMS)
7. What is your MOQ?
A: Small order and sample order are acceptable
8. Do you have any After-Sales service?
A: Yes!Our
