Rexroth A4VG axial piston hydraulic pump for the Wirtgen Mining Equipment 128949 137165 138828 146994 154407 167036 2062675 84389
- Product Details
- Product Model
- FAQ
The A4VG is a swashplate-design, variable-displacement axial piston pump built for closed-circuit hydrostatic transmissions. In a closed circuit, oil flows from the pump to the hydraulic motor and returns directly to the pump inlet instead of going back to a tank. This gives fast response, precise speed control, and the ability to brake the machine hydraulically.
The A4VG family spans a wide range of displacements, from compact units of roughly 28 cm³/rev up to large frame sizes around 250 cm³/rev. It has been offered in several generations, with Series 32 and Series 40 being the ones most often encountered in mobile machinery. Larger frame sizes are the ones relevant to track-driven mining machines.
Why the A4VG Fits Wirtgen Mining Equipment
The Operating Environment
Wirtgen's surface miners cut and crush material in a single pass, which means the machine has to hold a controlled forward speed while the cutting drum works against variable hardness. Add dust, vibration, slopes, and shifts that run around the clock, and you have one of the harshest duty cycles in mobile hydraulics.
What a Hydrostatic Drive Gives You
A closed-circuit hydrostatic travel system with a pump like the A4VG offers several benefits in this setting:
Infinitely variable feed speed. The operator or machine control can match advance rate to cutting conditions.
Strong traction at low speed. High torque is available when the machine is pushing hard into the material.
Dynamic braking. The drive holds the machine back on inclines without relying only on mechanical brakes.
Electronic control compatibility. Electro-proportional (EP) control options let the machine's controller adjust displacement directly, which supports load-sensing strategies and automatic feed control.
Understanding A4VG Control Options
The control type affects how the pump behaves, so it should be matched exactly when replacing a unit.
EP: Electro-Proportional Control
A solenoid-driven valve sets displacement in proportion to an electrical current. This is common in machines with electronic drive management.
HD: Hydraulic Control, Pilot Pressure Related
Displacement follows a hydraulic pilot signal, often from a joystick or pedal valve.
DA: Speed-Related Control
Displacement depends on drive speed and a pedal or valve input, which gives automotive-style driving behavior.
HW: Mechanical Servo Control
A manual lever adjusts displacement directly. This is less common on modern high-end equipment.
How to Choose or Verify the Right A4VG
Read the Nameplate First
The nameplate carries the full type designation and the material number. Together, these identify the frame size, series, control, rotation direction, shaft type, port configuration, and through-drive option. Photograph it before removing the pump.
Key Specifications to Confirm
1. Frame size (displacement per revolution)
2. Series (for example, 32 or 40)
3. Direction of rotation (clockwise or counterclockwise, viewed from the shaft)
4. Control type and voltage (for EP, usually 12 V or 24 V)
5. Mounting flange and shaft spline
6. Through-drive flange for auxiliary pumps
7. Port type and size (SAE flange vs. threaded)
8. Factory pressure settings (high-pressure relief, cut-off, charge)
For more brands and equipment models, please visit https://www.baolilaihydraulic.com/brand/
| Application equipment brands | Application equipment No. |
| Wirtgen | 128949 |
| Wirtgen GmbH | 137165 |
| Wirtgen | 138828 |
| Wirtgen | 138842 |
| Wirtgen GmbH | 146994 |
| Wirtgen GmbH | 154407 |
| Wirtgen GmbH | 167036 |
| Wirtgen | 2062675 |
| Wirtgen | 84389 |
Q1: How long does an A4VG pump last in mining service?
A1: There is no universal figure. Life depends on duty cycle, oil cleanliness, and temperature control. With excellent filtration and maintenance, hydrostatic pumps can run many thousands of hours before overhaul.
Q2: What are the first signs of pump wear?
A2: Rising case drain flow, longer warm-up times, reduced travel speed under load, increased oil temperature, and unusual noise.
Q3: What is the price and delivery time of the A4VG hydraulic pump for the Wirtgen Mining Equipment?
A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.
Q4: How do I purchase an A4VG hydraulic pump for the Wirtgen Mining Equipment?
A4: Visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.
