Rexroth axial piston variable hydraulic pumps for Bauer drilling rig 394668 399454 458869 481962 444951 409776 237755 385313

Why Bauer Drilling Rigs Rely on Rexroth Pumps Specifically

Load-Sensing Control Matches Drilling's Unpredictable Loads

Most Bauer rigs — from the compact BG 15 to the large BG 40 and MC-series multi-purpose machines — use Rexroth pumps fitted with load-sensing (LS) regulators, often in the A4VG or A11VO families. Load sensing lets the pump deliver exactly the flow the actuator demands, at exactly the pressure the load requires, rather than dumping excess flow across a relief valve. For an operator swinging the kelly drive, crowding down on a rock seam, and running the desanding pump simultaneously, this means every function gets what it needs without one circuit starving another.

Closed-Circuit Pumps for Kelly Drive and Winches

The Kelly drive rotation and the main winches on Bauer rigs typically run in closed hydraulic circuits, and this is where the Rexroth A4VG (mobile, closed-circuit, axial piston, variable displacement, dual pump/motor unit) earns its reputation. Closed-circuit operation recirculates fluid between pump and motor rather than returning it to tank, which improves response time and lets the drive reverse rotation instantly — essential when a kelly bar has to reverse to clear cuttings or recover from an auger jam.

Electro-Hydraulic Control for Precision Piling

On rigs used for CFA (continuous flight auger) and diaphragm wall work, precision matters as much as raw power — concrete or bentonite placement rates have to track auger withdrawal speed almost exactly to avoid voids or overpour. Rexroth's electro-hydraulic proportional control (EP) variants let the rig's onboard controller — often a Bauer BAUER Process Integrated Control (PIC) or similar system — modulate pump displacement directly, giving programmable, repeatable pump response rather than relying purely on operator feel.

Robustness in a Harsh Duty Cycle

Foundation drilling is dirty, vibration-heavy, thermally demanding work. Rexroth's axial piston pumps are built with tapered roller bearings rated for high radial and axial loads from the swash plate mechanism, and their displacement control housings are sealed and filtered to cope with the dust and thermal cycling typical of a construction site. This durability is a major reason OEMs like Bauer, Liebherr, and Soilmec have standardized on the platform rather than switching suppliers between projects.

Common Rexroth Pump Series Found on Bauer Rigs

A4VG — Closed-Circuit Travel and Winch Drives

The A4VG series is a variable displacement pump commonly paired with a variable A6VM motor in the same housing footprint used for track drive and hoist/winch systems. It's frequently seen on Bauer's undercarriage travel drives and main winch circuits, where reversible, high-response power transmission is critical.

A11VO / A11VG — High-Pressure Main Circuits

The A11VO (open circuit, industrial mounting) and A11VG (mobile mounting) series are heavier-duty pumps often used for the kelly drive's rotary function or for auxiliary high-pressure work, such as crowd cylinders and the main pump bank feeding a load-sensing manifold.

A10VO / A10VG — Auxiliary and Mid-Range Circuits

Smaller and mid-frame variants such as the A10VO/A10VG series often serve auxiliary functions: cooling fan drives, desanding pump circuits, and smaller CFA rigs where full A11-class flow isn't required.

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Q1: Can a Rexroth pump from one Bauer model be used on another?

A1: Sometimes, but not as a rule. Displacement size, control type (mechanical LS vs. electro-hydraulic EP), shaft spline, and mounting flange all have to match the receiving rig's manifold and control system. Always verify against the rig's parts documentation or with a Rexroth-authorized dealer before swapping units between models.

Q2: How long do these pumps typically last on a drilling rig?

A2: With disciplined fluid cleanliness and maintenance, it's common to see 10,000–15,000 hours or more before a rebuild is needed. Sites with poor filtration discipline or heavy contamination exposure can see that number cut substantially.

Q3: What is the price and delivery time of the Rexroth hydraulic pump for the Bauer drilling rig？

A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.

Q4: How to purchase a Rexroth hydraulic pump for the Bauer drilling rig?

A4: You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.