描述
A7VO28 A7VO55 A7VO80 A7VO107 A7VO160 REXROTH A7VO Series 63 Axial Piston Variable Pump
The Rexroth A7VO Series 63 refers to a comprehensive lineup of open‑circuit variable displacement axial piston pumps widely used in heavy‑duty hydraulic systems. Covering displacement grades A7VO28, A7VO55, A7VO80, A7VO107 and A7VO160, this Series 63 pump family delivers high pressure stability, precise flow regulation and long service life for construction machinery, mining equipment, industrial hydraulic stations and mobile engineering systems.
Each model in the REXROTH A7VO Series 63 features different geometric displacement sizes:
- A7VO28: 28 cm³/rev
- A7VO55: 55 cm³/rev
- A7VO80: 80 cm³/rev
- A7VO107: 107 cm³/rev
- A7VO160: 160 cm³/rev
From small-flow precision hydraulic units to large-displacement heavy-load systems, the A7VO Series 63 covers diversified industrial and mobile machinery requirements, becoming one of the most reliable variable piston pump series from Bosch Rexroth.
Hydraulic Fluid Compatibility
All pumps in the REXROTH A7VO Series 63 (A7VO28, A7VO55, A7VO80, A7VO107, A7VO160) are factory-calibrated for standard mineral-based hydraulic oil, complying with ISO VG 46 and ISO VG 68 HLP grade specifications.
For special working conditions requiring fire-resistant, biodegradable or synthetic hydraulic fluids, users must confirm seal compatibility in advance. Most alternative fluid environments require upgraded FKM sealing assemblies to avoid chemical corrosion, aging and external leakage.
To maintain stable working efficiency across the entire A7VO Series 63 range, the operating oil viscosity must be kept between 16–36 cSt. For low-temperature start-up scenarios common in northern regions or high-altitude equipment, the maximum cold-start viscosity must not exceed 1000 cSt to prevent insufficient suction, abnormal noise and internal component wear.
Case Drain System Requirements
Every model in the A7VO Series 63 including A7VO28, A7VO55, A7VO80, A7VO107 and A7VO160 requires an independent external case drain pipeline installed above the hydraulic tank liquid level.
The case drain system undertakes two core functions:
- Discharging internal leakage oil from the piston rotating group and valve plate
- Dissipating accumulated heat generated during high-pressure operation
Any form of pipeline blockage, bending resistance or backpressure will cause rising case pressure, which directly damages shaft seals and leads to severe pump failure. The safe case pressure limit for all A7VO Series 63 pumps is controlled within 3 bar. Excessive backpressure is the most common cause of oil leakage and premature scrapping.
Shaft Installation and Alignment Standards
The entire REXROTH A7VO Series 63 axial piston variable pump series has strict restrictions on shaft load tolerance.
A7VO28, A7VO55, A7VO80, A7VO107 and A7VO160 pumps cannot bear excessive radial or axial external force during operation. For standard SAE direct drive configurations, the pump shaft nose allows zero radial overhung load.
Installers must adopt high-precision flexible couplings and ensure total indicator runout (TIR) alignment error below 0.05 mm. Misalignment will cause shaft vibration, abnormal noise and accelerated wear of bearings and piston assemblies.
Hydraulic Filtration Standards
To extend the service life of A7VO Series 63 pumps, Rexroth officially recommends 10μm precision filtration (β10 ≥75) for return lines or pressure lines.
Simple suction filtration cannot meet the cleanliness requirements of axial piston pumps. All A7VO28, A7VO55, A7VO80, A7VO107, A7VO160 variable pumps must be equipped with independent return filtering or offline circulating filtration systems to effectively intercept tiny metal particles, dust and impurities. Clean oil quality is the core guarantee for stable pump displacement and volumetric efficiency.
Routine Maintenance Cycle
Regular standardized maintenance greatly reduces failure rates for the entire A7VO Series 63 pump range.
- Hydraulic oil analysis: every 500–1000 working hours or at least once a year, detecting viscosity changes, acid value rising, particle contamination and water infiltration
- Filter replacement: replace filter elements according to pressure difference prompts or manufacturer cycle standards
- Case drain flow inspection: regularly monitor drain flow volume; abnormal flow increase indicates internal wear of piston cylinder and valve plate
Common Fault Analysis & Troubleshooting
1. Abnormal Noise / Cavitation
Cavitation issues occur universally across A7VO28, A7VO55, A7VO80, A7VO107 and A7VO160 pumps, mainly caused by blocked suction filters, collapsed oil pipes or air-entrained hydraulic fluid. Long-term cavitation will severely scratch the piston and cylinder barrel pairing surface, leading to permanent efficiency decline.
2. Excessive Operating Temperature
Overheating usually results from blocked case drain pipelines, unstable relief valve pressure or deteriorated hydraulic oil viscosity. High temperature will accelerate seal aging and reduce the overall service life of the A7VO Series 63 pump.
3. Insufficient Output Flow
Reduced flow output indicates worn valve plate and cylinder barrel friction pairs or abnormal control valve signal failure, which prevents the pump from reaching full displacement adjustment range.
4. Shaft Seal Oil Leakage
Shaft seal failure is almost always caused by excessive case backpressure. Inspect drain pipeline smoothness, manifold backpressure and installation height to eliminate hidden dangers.
Summary
The REXROTH A7VO Series 63 axial piston variable pump, covering A7VO28, A7VO55, A7VO80, A7VO107 and A7VO160 full displacement models, is the mainstream high-pressure hydraulic power unit for global engineering machinery. Standardized installation, precise filtration, qualified fluid selection and periodic maintenance are essential to ensure long-term stable operation of all A7VO series pumps.
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| A7VO107 axial piston hydraulic pump | |
| Model No. | Model Code |
| R909428470 | A7VO107DR/61L-PPB01 |
| R909429974 | A7VO107DR/61L-PZB01 |
| R909604354 | A7VO107DR/61L-PZB01-S |
| R909610265 | A7VO107DR/61L-VPB01 |
| R909427871 | A7VO107DR/61R-PPB01 |
| R909429973 | A7VO107DR/61R-PZB01 |
| R909605760 | A7VO107DR/61R-VPB01 |
| R902033194 | A7VO107DR/63L-NPB01 |
| R902170408 | A7VO107DR/63L-NPB01 |
| R902092764 | A7VO107DR/63L-NPB01-E |
| R902052116 | A7VO107DR/63L-NSB01 |
| R909610399 | A7VO107DR/63L-NZB01 |
| R902216598 | A7VO107DR/63L-NZB01 |
| R902170447 | A7VO107DR/63L-NZB01 |
| R902021867 | A7VO107DR/63L-NZB01-S |
| R902047464 | A7VO107DR/63L-NZB01-S |
| R902211565 | A7VO107DR/63L-NZB01-S |
| R902084218 | A7VO107DR/63L-NZB01-Y |
| R902250525 | A7VO107DR/63L-VPB01 |
| R902250701 | A7VO107DR/63L-VSB01 |
| R902100020 | A7VO107DR/63L-VZB01 |
| R902226013 | A7VO107DR/63L-VZB01 |
| R902006767 | A7VO107DR/63R-NPB01 |
| R902216612 | A7VO107DR/63R-NPB01 |
| R902208663 | A7VO107DR/63R-NPB01 |
| R902239700 | A7VO107DR/63R-NPB01 |
| R902249682 | A7VO107DR/63R-NPB01 |
| R902233120 | A7VO107DR/63R-NPB01 |
| R902216601 | A7VO107DR/63R-NPB01 |
| R902245538 | A7VO107DR/63R-NPB01 |
| R902237092 | A7VO107DR/63R-NPB01 |
| R902223234 | A7VO107DR/63R-NPB01 |
| R902052106 | A7VO107DR/63R-NSB01 |
| R909610394 | A7VO107DR/63R-NZB01 |
| R902216613 | A7VO107DR/63R-NZB01 |
| R902229380 | A7VO107DR/63R-NZB01 |
| R902163588 | A7VO107DR/63R-NZB01-S |
| R902063616 | A7VO107DR/63R-VPB01 |
| R902170496 | A7VO107DR/63R-VPB01 |
| R902226290 | A7VO107DR/63R-VPB01 |
| R902011923 | A7VO107DR/63R-VZB01 |
| R902226012 | A7VO107DR/63R-VZB01 |
| R909603407 | A7VO107DRG/61L-PZB01 |
| R909448276 | A7VO107DRG/61R-PPB01 |
| R902067805 | A7VO107DRG/63L-NPB01 |
| R902067627 | A7VO107DRG/63L-NSB01 |
| R909611219 | A7VO107DRG/63L-NZB01 |
| R902226149 | A7VO107DRG/63L-NZB01 |
| R902203993 | A7VO107DRG/63L-NZB01-E |
| R902247291 | A7VO107DRG/63L-VPB01 |
| R902042487 | A7VO107DRG/63R-NPB01 |
| R902227753 | A7VO107DRG/63R-NPB01 |
| R902257643 | A7VO107DRG/63R-NPB01 |
| R902223138 | A7VO107DRG/63R-NPB01 |
| R902226458 | A7VO107DRG/63R-NPB01 |
| R902223139 | A7VO107DRG/63R-NPB01 |
| R902077303 | A7VO107DRG/63R-NSB01 |
| R909611218 | A7VO107DRG/63R-NZB01 |
| R902038764 | A7VO107DRGM/63L-NZB01 |
| R909446210 | A7VO107DRM/61R-PPB01 |
| R902038762 | A7VO107DRM/63R-NPB01 |
| R909446992 | A7VO107DRS/61L-DZB01 |
| R909437722 | A7VO107DRS/61L-DZB01-S |
| R909427875 | A7VO107DRS/61L-PPB01 |
| R909442840 | A7VO107DRS/61L-PZB01 |
| R909605130 | A7VO107DRS/61L-PZB01-S |
| R909603076 | A7VO107DRS/61R-DZB01 |
| R909437332 | A7VO107DRS/61R-DZB01-S |
| R909605359 | A7VO107DRS/61R-PPB01 |
| R909446694 | A7VO107DRS/61R-PPB01 |
| R909427873 | A7VO107DRS/61R-PZB01 |
| R909610574 | A7VO107DRS/61R-PZB01-S |
| R909441395 | A7VO107DRS/61R-PZB01-S |
| R909448251 | A7VO107DRS/61R-PZB01-S |
| R909610847 | A7VO107DRS/61R-PZB01-S |
| R902035333 | A7VO107DRS/63L-NZB01 |
| R902237489 | A7VO107DRS/63L-NZB01 |
| R902222237 | A7VO107DRS/63L-NZB01 |
| R902222056 | A7VO107DRS/63L-NZB01 |
| R902043792 | A7VO107DRS/63L-NZB01-S |
| R902040411 | A7VO107DRS/63L-NZB01-S |
| R902226195 | A7VO107DRS/63L-VPB01 |
| R902253974 | A7VO107DRS/63L-VZB01-S |
| R902052188 | A7VO107DRS/63R-NPB01 |
| R902011870 | A7VO107DRS/63R-NZB01 |
| R902208740 | A7VO107DRS/63R-NZB01 |
| R902031887 | A7VO107DRS/63R-NZB01-S |
| R902217584 | A7VO107DRS/63R-NZB01-S |
| R909610097 | A7VO107EP/61L-PPB01 |
| R909438221 | A7VO107EP/61L-PZB01 |
| R909438605 | A7VO107EP/61R-PPB01 |
| R909438975 | A7VO107EP/61R-PZB01 |
| R902050893 | A7VO107EP/63L-NPB01 |
| R902052122 | A7VO107EP/63L-NSB01 |
| R909610401 | A7VO107EP/63L-NZB01 |
| R902227645 | A7VO107EP/63L-NZB01 |
| R902014305 | A7VO107EP/63R-NPB01 |
| R902229223 | A7VO107EP/63R-NPB01 |
| R902216614 | A7VO107EP/63R-NPB01H |
| R902094649 | A7VO107EP/63R-NPB01-S |
| R902070538 | A7VO107EP/63R-NPB01-S |
| R902227592 | A7VO107EP/63R-NPB01-S |
| R902052112 | A7VO107EP/63R-NSB01 |
| R909610396 | A7VO107EP/63R-NZB01 |
| R902226075 | A7VO107EP/63R-NZB01 |
| R902226333 | A7VO107EP/63R-NZB01 |
| R902223137 | A7VO107EP/63R-NZB01 |
| R902217996 | A7VO107EP/63R-NZB01H |
| R902216616 | A7VO107EP/63R-NZB01H |
| R902216631 | A7VO107EP/63R-NZB01H |
| R909447116 | A7VO107EP1D/61L-PZB01 |
| R902247416 | A7VO107EP2/63R-VPB01P |
| R909433353 | A7VO107EPD/61L-PZB01 |
| R909434649 | A7VO107EPD/61R-DPB01 |
| R909427961 | A7VO107EPD/61R-PPB01 |
| R909433352 | A7VO107EPD/61R-PZB01 |
| R909448545 | A7VO107EPD/61R-VPB01 |
| R902075293 | A7VO107EPG/63L-VZB01 |
| R902030937 | A7VO107EPG/63R-NPB01 |
| R902092580 | A7VO107EPG/63R-NPB01-E |
| R902006826 | A7VO107EPG/63R-NZB01 |
| R909605609 | A7VO107HD1/61L-PPB01 |
| R909604819 | A7VO107HD1/61L-PZB01 |
| R909604817 | A7VO107HD1/61R-PZB01 |
| R902014307 | A7VO107HD1/63L-NPB01 |
| R902052120 | A7VO107HD1/63L-NSB01 |
| R909610400 | A7VO107HD1/63L-NZB01 |
| R902043553 | A7VO107HD1/63L-NZB01-S |
| R902050897 | A7VO107HD1/63R-NPB01 |
| R902052110 | A7VO107HD1/63R-NSB01 |
| R909610395 | A7VO107HD1/63R-NZB01 |
| R902253664 | A7VO107HD1/63R-VSB01 |
| R909428911 | A7VO107HD1D/61L-PZB01 |
| R909434619 | A7VO107HD1D/61R-PPB01 |
| R909428909 | A7VO107HD1D/61R-PZB01 |
| R902006723 | A7VO107HD1G/63L-NZB01 |
| R902253996 | A7VO107HD1G/63L-NZB01 |
| R902216633 | A7VO107HD1G/63L-NZB01 |
| R992001586 | A7VO107HD1G/63L-NZB01 |
| R902115604 | A7VO107HD1G/63R-NPB01 |
| R902227776 | A7VO107HD1G/63R-NZB01 |
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