A8VO80LA1KH2/63R1-NSG05F000-S Rexroth Excavator Pump 350bar

Product Overview

The A8VO80LA1KH2/63R1-NSG05F000-S is a Bosch Rexroth A8VO series bent-axis variable double pump, built for multi-circuit mobile hydraulics such as excavators, cranes, and drilling rigs. As an excavator main pump, its two rotary groups share one suction port, mount directly onto the diesel engine flywheel case, and deliver flow proportional to input speed and displacement, infinitely variable between maximum and zero. We supply a compatible / interchangeable replacement for the original model, with 100% simulated operating-condition testing on every unit to ensure fitment consistency and long service life.

Technical Specifications

• Model: A8VO80LA1KH2/63R1-NSG05F000-S (Rexroth A8VO bent-axis variable double pump)
• Displacement (per rotary group, Vg max): 80 cm³; combined theoretical displacement ≈ 160 cm³/rev
• Nominal pressure: 350 bar; Peak pressure: 400 bar (open circuit)
• Maximum speed at Vg max: 2240 rpm; up to 2750 rpm at Vg ≤ Vg max
• Flow per pump at Vg max, nnom: ≈ 179 L/min; combined ≈ 358 L/min
• Control: LA1KH2 — load sensing (LA1K) with hydraulic stroke limitation, negative control with external pilot pressure supply
• Rotation (viewed from shaft end): clockwise (R)
• Gear ratio: i = 1 (input speed = rotary group speed)
• Seals: NBR main seals, FKM (fluorocarbon) shaft seal
• Mounting: to flywheel case of internal combustion engine per SAE J617, splined shaft DIN 5480
• Weight (approx.): 90 kg
• Auxiliary pump / PTO: per suffix (NSG05F000 = manufacturer build options); confirm exact sub-options against the order code
• Fluid: mineral oil recommended (VG 46 / VG 68); not suitable for HFA; HFB/HFC/HFD per RE 90221 / RE 90223

Key Technical Advantages

• Drop-in interchangeability: Built to the original dimensions and interfaces so it replaces the genuine A8VO80LA1KH2/63R1-NSG05F000-S, cutting downtime.
• 100% simulated operating-condition testing: Every unit is bench-tested under simulated load to verify volumetric efficiency, seal reliability, and noise.
• High power density and long life: Bent-axis design with two rotary groups sharing one suction port gives a compact, light, durable package.
• Load sensing + stroke limitation: LA1KH2 control matches output to demand and reduces relief losses; negative control suits multi-actuator excavator duty.
• Integrated auxiliary pump and PTO: Parallel mounting of gear or axial piston pumps extends pilot and control circuits.

Application Areas

• Excavators (main pump; travel and swing multi-circuits)
• Cranes and crawler cranes
• Drilling and piling machinery
• Concrete pump trucks, mining equipment
• Other open-circuit high-pressure mobile hydraulic systems

Expert Maintenance Tips

• Cleanliness: Keep the system to ISO 4406 19/17/14 or better to protect the piston/cylinder interface.
• Case drain: Maintain case drain back-pressure within limits to protect the shaft seal.
• Bleed on start-up: After commissioning or long shutdown, jog and run at low pressure to purge air.
• Inlet condition: Keep suction port absolute pressure ≥ 1 bar to avoid cavitation; ensure sealed suction lines.
• Control calibration: Verify pilot pressure and negative control signal so the power setting matches the machine.
• Alignment and torque: Align to the flywheel case and torque fasteners to spec to avoid bearing misload.
• Temperature: Keep fluid in the recommended viscosity band (VG 46/68); avoid sustained high temperature that ages seals.