Rexroth A8VO Pump Replacement | A8VO80 A8VO107 A8VO140 Excavator Hydraulic Pump

Genlu Hydraulic excels as a world-class engineered product manufacturer, field innovator, and strategic supplier of high-pressure, heavy-duty axial piston units designed for open-circuit hydrostatic drives. The A8VO Series Axial Piston Variable Double Pump is custom-manufactured as a premium, structurally optimized, and 100% drop-in interchangeable alternative to the definitive industrial baseline—the Germany Bosch Rexroth A8VO series (encompassing Series 60, 63, and 72 legacies). We maintain standardized production runs and an instantaneous distribution readiness for all major heavy excavator main pumps, including A8VO55, A8VO80 (specifically the high-demand excavator configuration: A8VO80LA1KH2/63R1-NSG05F000-S), A8VO107, A8VO140, and A8VO200 assemblies.

As the operational heart of heavy hydraulic excavators, multi-circuit crawler rigs, and rotary drilling platforms, a double pump’s exact summatic power tracking, peak pressure resilience, and fatigue life under cyclic high-stress profiles define the operating economics of the machine. Genlu’s A8VO variable double pumps are built in absolute structural alignment with original manufacturer manuals. The twin bent-axis rotary groups fitted with tapered pistons align completely with factory flow dynamics and the exact hyperbolic response curves of the integrated power override system. Every single dual-pump machine undergoes 100% Full-Simulation Condition Testing at a sustained 350 bar rated pressure before dispatch clearance, validating zero-drift cross-sensing compliance and matching OEM mechanical efficiency metrics.

Technical Specifications 

• Product Line: A8VO Series Axial Piston Variable Double Pump (100% compatible with Rexroth A8V / A8VO footprints)

• Definitive Order Code: A8VO80LA1KH2/63R1-NSG05F000-S

• Geometric Displacement ($V_{g\,max}$): 80.0 $cm^3$ per single rotary group (Dual rotary groups configuration yielding a combined displacement of 160.0 $cc/rev$. Platform scale supports 55 to 200 $cc/rev$ builds)

• Nominal Rated Operating Pressure: 350 bar (35.0 MPa / 5075 psi) continuous steady-state loading

• Maximum Peak Working Pressure: 400 bar (40.0 MPa / 5800 psi) transient threshold matching extreme breakdown excavator breakouts

• Maximum Permissible Driving Rotational Velocity: Up to 2240 rpm (Conditioned under optimized absolute inlet suction metrics)

• Maximum Combined Oil Flow Output: Yields up to 2 x 179 $L/min$ when driven at maximum permissible velocity limits

• Control Mechanism Logic: LA1KH2 Configuration (Equipped with cross-sensing summation power control, hydraulic proportional pilot control, and high-pressure cross-compensation overrides)

• Direction of Shaft Rotation: R (Clockwise rotation when viewed looking directly at the primary input drive shaft)

• Sealing Configuration Profile: N Variant (High-spec NBR elastomer shell backed by a premium Viton high-pressure dynamic shaft seal; rated range -25°C to +90°C)

• Auxiliary Power Take-Off Drive: S Pattern (Equipped with a standard through-shaft drive rear flange to couple secondary pilot or gear charge pumps)

• Total Dry Assembly Mass: Approximately 100.50 kg (High power-to-weight structural engineering)

Key Technical Advantages:

• High-Efficiency Dual Bent-Axis Tapered Piston Rotary Assembly: The structural baseline of the A8VO centers on twin bent-axis variable rotary groups configured parallel inside a single monolithic block. Genlu utilizes high-purity forged alloy steel for the pistons and the rotor cylinders. The spherical port plate surfaces are precision-lapped to maintain a fluid wedge film under high pressure, minimizing volumetric fluid slip at 350 bar continuous duties.

• Smart Cross-Sensing Summation Power Override Controller: The coupled LA1KH2 dual-valve regulator mechanically and hydraulically aggregates load pressures from both circuit pumps. If circuit A encounters sudden hard rock resistance, generating a massive pressure spike, the regulator immediately strokes down circuit B’s displacement. This keeps the engine balanced to prevent engine stalling or drop-outs.

• Heavy-Duty Tandem Tapered Roller Bearing Main Assembly: Engineered to survive the extreme vibration profiles and axial pulsations coming from diesel engine flywheels during field operation. The primary input drive shaft is stabilized by an oversized tandem tapered roller bearing layout. This construction handles severe交变 internal shear forces, keeping the shaft concentric to guarantee zero dynamic leakage across the shaft seal.

• Monolithic Common Suction Port Enclosure with Anti-Cavitation Architecture: The outer main case is cast from high-tensile nodular spheroidal graphite iron. It features a streamlined 5-chamber internal manifold that merges the inputs of both pumps into a single common suction port. This design lowers inlet suction resistance, improves anti-cavitation margins at high speeds, and dampens fluid-borne operating noise.

Application Areas:

• Heavy Crawler Excavators: Functions as the primary open-circuit hydraulic engine for 20-ton to 35-ton tracked heavy excavators (fully compatible with Sany, XCMG, Caterpillar, and Komatsu system swaps).

• Rotary Drilling Rigs & Mobile Cranes: Manages high-pressure distribution lines supplying main winch drum drives, auxiliary pull-down configurations, and heavy rotary head motors.

• Specialized Heavy Infrastructure Machinery: TBM (Tunnel Boring Machine) auxiliary hydraulic blocks, high-output concrete boom pump trucks, and open-loop winches on marine cargo vessels.

Expert Maintenance Tips:

• Mandatory Flashing and Verification of the LA1KH2 Pilot Orifice Matrix: The structural fluidity of an excavator’s operations relies on the integrity of the pilot orifices built into the LA1KH2 block. When swapping an A8VO80LA1KH2 pump, always check and flush the internal micro-mesh screen and damping screws. Ultrafine particulate contamination inside the pilot oil lines can cause the hyperbolic power spool to stick, leading to erratic engine lugging or jerky boom operations.

• Strict Case Air Bleeding Protocol Prior to Engine Ignition: Due to the massive dry internal volume of the A8VO double pump, you must pre-fill the pump case with at least 3.5 Liters of clean hydraulic fluid via the highest available drain port before cranking the engine. Manually rotate the engine flywheel a few turns after filling, and idle the diesel engine under zero load for 5 to 10 minutes to vent all trapped air. Dry starts will immediately score the bent-axis synchronizing links.

• Prohibit Suction Line Filtration Below a Tight 25-Micron Threshold: Variable open-circuit piston pumps are susceptible to inlet restriction and starvation. Never place a fine-mesh suction filter (lower than 100 $\mu m$) inside the main suction line. All precision ultra-fine filtration must be confined to the return line filter matrix or dedicated off-line kidneys. Restricting suction causes extreme cavitation at speeds over 1800 rpm, which can erode the cylinder bimetal layer within hours.