Rexroth A4VG closed-circuit hydraulic pump for the Wacker Neuson Weidemann wheel loader 1000062272 1000204593 1000207428 1000209174 5011020849 1000283572
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When a Weidemann wheel loader hesitates on a ramp, creeps in neutral, or runs hot under a full bucket, the travel pump is usually the first suspect. On many Weidemann machines that pump is a Bosch Rexroth A4VG, a closed-circuit axial piston unit built for hydrostatic transmissions.
What the Rexroth A4VG Actually Does
A variable pump built for closed circuits
Bosch Rexroth describes the A4VG as a swashplate-design variable axial piston pump for hydrostatic closed-circuit transmissions. In practice that means:
Output flow is set by engine speed and swashplate angle. Flow rises as the swashplate swivels from zero toward its maximum, and it is infinitely variable.
Direction reverses through neutral. Flow direction changes smoothly as the swashplate passes through the neutral position. This is why a Weidemann can shuttle forward and reverse from a joystick without a conventional gearbox clutch pack.
Built-in protection. Two pressure-relief valves on the high-pressure ports protect the pump and motor from overload.
Why closed circuit suits a wheel loader
In an open circuit, oil returns to the tank after each use. In a closed circuit, the pump feeds the drive motors directly, and the oil returns straight to the pump inlet. That gives you tight speed control, strong dynamic braking (the drive itself slows the machine, which is why Weidemann can advertise a wear-free hydrostatic service brake acting on all four wheels), and a compact layout. The trade-off is heat and contamination sensitivity, because the same oil circulates under high pressure continuously.
Common Failure Symptoms on a Weidemann Loader
Machine loses drive under load
Likely causes include worn pistons or slipper pads, a leaking high-pressure relief cartridge, or low charge pressure. Check charge pressure first, since it costs nothing.
Creeping in neutral or uneven forward/reverse
This often points to the control side: a misadjusted or contaminated DA control, a faulty solenoid or connector, or a stuck servo piston. Check the electrical connector and supply voltage before pulling the pump.
Overheating and whining
Excess case drain flow is the classic warning sign of internal wear. High heat plus a high-pitched whine also suggests cavitation from a restricted suction or charge circuit.
Metal in the filter
Steel or bronze particles mean the pump is already shedding material. Stop, flush the whole circuit including the motors and cooler, and don't fit a new pump into contaminated oil. That's the fastest way to kill it twice.
Maintenance Habits That Extend Pump Life
Fluid cleanliness first. Change filters on schedule and use a proper ISO 4406 cleanliness target from the service manual.
Watch temperature. Keep the oil cooler clean, since a blocked cooler quietly shortens pump life.
Sample the oil. Lab analysis catches wear metals before symptoms appear.
Follow the cold-start routine. Let the oil warm before working at full load.
Bleed and prime properly after any pump change, and confirm charge pressure with a gauge.
For more brands and equipment models, please visit https://www.baolilaihydraulic.com/brand/
| Application equipment brands | Application equipment No. |
| Wacker Neuson | 1000062272 |
| Wacker Neuson( Kramer) | 1000073352 |
| Weidemann GmbH | 1000204593 |
| Weidemann/ Wacker Neuson | 1000207356 2070LP/T |
| Weidemann GmbH | 1000207374 |
| Weidemann | 1000207428 Wheel loader 1010/2006/1490/ZF |
| Weidemann GmbH | 1000209174 Wheel loader 3006(30KM/H),5006 |
| Weidemann( Wacker Neuson) | 1000283571 TL48 |
| Weidemann( Wacker Neuson) | 1000283572 TL48 |
| Wacker | 5011020849 |
| Weidemann | 5011020849 |
| Weidemann | 5011020849/0008 |
| Weidemann | 5011079691/0411 |
| Weidemann | 557+559/0401 |
Q1: What is the Rexroth A4VG pump used for on a Weidemann wheel loader?
A1: It is the hydrostatic travel pump. It delivers oil to the drive motors, sets speed and direction through the swashplate angle, and provides charge pressure to the closed loop.
Q2: How long should an A4VG last?
A2: There's no fixed figure. With clean oil, proper cooling, and correct operation, these pumps commonly run for many thousands of hours. Contamination and heat are the biggest killers.
Q3: What is the price and delivery time of the A4VG hydraulic pump for the Wacker Neuson Weidemann wheel loader?
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 Wacker Neuson Weidemann wheel loader?
A4: Visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.
