Rexroth A4VG axial piston pump for the Sennebogen material handling machine 095919 114614 114615 114616 123721 139-9530 141205

The A4VG is a variable-displacement, swashplate-design axial piston pump built for closed hydrostatic circuits. Rexroth designed it specifically for drivetrains where a pump and a matching hydraulic motor (typically an A6VM or A2FM) form a closed loop — no return to tank between the two, just continuous circulation with a small charge pump topping off losses. That architecture is exactly what a tracked or wheeled travel drive needs: proportional speed control, full reversibility, and the ability to generate high torque at low speed when a machine is working through debris or climbing a ramp with a loaded grapple.

Why Sennebogen Chose the A4VG for Its Material Handlers

Sennebogen's material handling range — the 830, 835, 850, 870 and larger crawler and purpose-built port machines — is built around a philosophy of high uptime with minimal hydraulic complexity where possible, but maximum controllability where the operator needs it. The A4VG fits that philosophy on two fronts.

Precision Under Cyclic, Reversing Loads

A scrap handler doesn't move in one direction for long. The undercarriage repositions constantly, the upper structure slews back and forth hundreds of times per hour, and the grapple opens and closes on an unpredictable rhythm dictated by the material pile. A closed-loop pump like the A4VG handles this kind of load reversal natively — the swashplate simply tilts through center, reversing flow direction without shock, rather than requiring directional valves to redirect an open-circuit flow.

Matching Engine Power to Variable Hydraulic Demand

Sennebogen pairs the A4VG's variable displacement with engine-speed-sensing and power-limiter controls (often referred to as DA or LR1/LR2 control options in Rexroth's nomenclature) so the pump only draws the horsepower the diesel engine currently has available. Under partial load, that means less fuel burned per cycle; under full load — say, lifting a heavy grapple load at the end of a long reach — the pump automatically de-strokes rather than stalling the engine.

Serviceability Across a Global Fleet

Because Rexroth's A4VG series is used across excavators, cranes, and forestry equipment from multiple manufacturers, parts availability and technician familiarity are strong worldwide — a real consideration for Sennebogen customers operating scrapyards and ports far from the factory in Straubing, Germany.

How the A4VG Powers Core Machine Functions

Travel Drive

On tracked Sennebogen material handlers, the A4VG (frequently in a tandem arrangement) feeds two closed-loop travel motors — one per track. Because each side of the tandem pump can be commanded independently, the machine can pivot-turn, counter-rotate its tracks, or crab-walk across uneven scrap piles with proportional control rather than the on/off feel of simpler hydrostatic systems.

Slew Circuit

On many models, a dedicated A4VG (or a section of a multi-pump pack) drives the slew motor through a closed circuit, giving the operator smooth acceleration and controlled braking of the upper structure — critical when swinging a loaded grapple over a truck bed or barge hold, where an abrupt stop can send material flying or induce dangerous sway.

Working Hydraulics (Boom, Stick, and Attachment)

On higher-spec machines and purpose-built port cranes, an additional A4VG or A4VSO unit supplies the main working circuit for boom lift, stick curl, and grapple rotation/open-close functions, often working alongside load-sensing open-circuit pumps for auxiliary attachments like magnets or shears.

Real-World Application Examples

Example 1: Scrap Yard Material Handler (Sennebogen 830 M-Series Class)

A scrapyard running a Sennebogen material handler with a magnet attachment cycles the boom and slew functions almost continuously across an 8- to 10-hour shift. The A4VG's closed-loop travel and slew circuits mean the operator can reposition the undercarriage in small increments between lifts without the jerky start-stop typical of simpler hydraulic architectures — reducing wear on final drives and undercarriage components over the life of the machine.

Example 2: Port and Barge Loading Machine

Purpose-built Sennebogen port machines handling bulk cargo or containers place enormous demand on slew smoothness, since operators are swinging heavy loads over fixed structures (ship holds, dock walls) where a collision is costly. Here, the A4VG's proportional displacement control — commanded electronically through the machine's onboard control system — lets operators "feather" slew acceleration precisely, something an on/off or simple two-stage hydraulic system cannot replicate.

Example 3: Demolition and Recycling Applications

In demolition, where a Sennebogen material handler might run a hydraulic shear or pulverizer, the A4VG on the travel circuit provides the low-speed, high-torque creep function operators need to inch the machine forward while the attachment works — again a direct benefit of variable displacement over a fixed-displacement gear pump.

For more brands and equipment models, please visit https://www.baolilaihydraulic.com/brand/

Q1: How long does an A4VG pump typically last in a material handling application?

A1: With clean fluid, proper charge pressure maintenance, and routine monitoring, A4VG pumps in demanding material handling duty commonly reach 8,000–12,000+ operating hours before requiring major overhaul, though actual life varies significantly with contamination control and duty cycle severity.

Q2: What hydraulic motor does the A4VG typically pair with in a closed loop?

A2: Rexroth's A6VM or A2FM axial piston motors are the most common closed-loop partners, though the specific pairing depends on the machine model and the torque/speed requirements of the travel or slew function it drives.

Q3: What is the price and delivery time of the A4VG hydraulic pump for the Sennebogen material handling machine?

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

Q4: How to purchase an A4VG hydraulic pump for the Sennebogen material handling machine?

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