PVWJ-011 PVK-140 PVM-025 Oilgear Axial Piston Pump

Product Overview

The PVWJ-011, PVK-140-A1UV-RDFS, and PVM-025-A1UB-LSFY are core models within the Oilgear open-loop axial piston variable displacement pump platform, belonging to the PVWJ series, PVK series, and PVM series respectively. Together, the three series cover the complete application spectrum from low-horsepower to heavy-duty industrial use: the PVWJ series is distinguished by low maintenance, high interchangeability, and low-viscosity media compatibility; the PVK series is positioned for high-pressure heavy-duty industrial applications; and the PVM series offers exceptional selection flexibility through its modular design.

PVWJ Series Core Features: Open-loop variable displacement axial piston pump; 3 frame sizes and 10 displacement rates (0.66–7.94 in³/rev); selectively match pressure and capacity; static seal (O-ring) design reduces control noise; patented pressure-lubricated swashblock design for high-cycling operations; fully field interchangeable with Oilgear PVWH pumps; thrives on low-viscosity fluids including high water content and fire-resistant fluids.

PVK Series Core Features: Open-loop high-pressure pump; longitudinally-mounted controls; modular design; SAE D 4-bolt mounting flange; suitable for medium to heavy-duty industrial hydraulic systems.

PVM Series Core Features: Open-loop variable piston pump; modular design with integrated charge pump and multiple control modes; standard SAE-B mounting flange; dual shaft options (straight keyed or splined shaft); low-noise droplet-shaped housing; volumetric efficiency exceeding 92%.

Model Code Breakdown (for procurement and engineering reference):

Using PVWJ-011-A1UV-RSAY-P-1NNNN as example:

• PVWJ: Oilgear PVWJ series open-loop variable axial piston pump

• 011: Nominal size, geometric displacement 10.8 cm³/rev

• A1UV: Mounting flange and port configuration code

• RSAY: Control type code

• P: Design variant

• 1NNNN: Factory calibration and additional configuration code

Using PVK-140-A1UV-RDFS-P-1NNSN-CP/217 as example:

• PVK: Oilgear PVK series open-loop high-pressure axial piston pump

• 140: Nominal size, geometric displacement 140 cm³/rev

• A1UV: Mounting flange and port configuration code

• RDFS: Control type code — Load Sensing + Pressure Compensation composite control

• P: Design variant

• 1NNSN: Additional configuration code

• CP/217: Factory calibration parameters and batch identifier

Using PVM-025-A1UB-LSFY-P-1NNNN-3 as example:

• PVM: Oilgear PVM series open-loop variable piston pump

• 025: Nominal size, geometric displacement 25.4 cm³/rev

• A1UB: Mounting flange and port configuration code

• LSFY: Control type code — Load Sensing + Pressure Compensation

• P: Design variant

• 1NNNN-3: Factory calibration and additional configuration code

Drop-in Replacement Advantage: Manufactured to exact Oilgear OEM specifications, these pumps achieve complete drop-in interchangeability with the original PVWJ/PVK/PVM series for SAE mounting flange, shaft dimensions, SAE standard port layout, and control module interface. The PVWJ series is directly interchangeable with PVWH pumps. Every pump undergoes 100% simulated load testing prior to shipment, validating rated pressure loading, control response, and volumetric efficiency under conditions replicating real-world duty cycles.

Technical Specifications 

PVWJ-011:

• Model Code: PVWJ-011

• Series: Oilgear PVWJ Series (Open Loop, Axial Piston Pump)

• Geometric Displacement: 10.8 cm³/rev (0.66 in³/rev)

• Rated Continuous Pressure: 5000 psi (344.8 bar)

• Peak Pressure: 5800 psi (400 bar)

• Maximum Speed: 3000 rpm

• Theoretical Flow at 1800 rpm (rated pressure): 4.2 GPM (15.9 L/min)

• Control Response: Medium response

• Mounting Flange: SAE B 2-bolt flange

• Shaft: SAE keyed or splined shaft

• Port Locations: Top/Bottom, Rear

• Housing Material: Ductile iron

• Working Fluid: Low-viscosity hydraulic fluids, traditional hydraulic fluids, high water content, fire-resistant fluids

• Weight: Approx. 30.9 kg (68 lbs)

• Through Drive: Available for driving multiple pumps from a single power source

PVK-140-A1UV-RDFS-P-1NNSN-CP/217:

• Model Code: PVK-140-A1UV-RDFS-P-1NNSN-CP/217

• Series: Oilgear PVK Series (Open Loop, High-Pressure Axial Piston Pump)

• Geometric Displacement: 141.0 cm³/rev (8.6 in³/rev)

• Rated Continuous Pressure: 5000 psi (345 bar)

• Peak Pressure: 5800 psi (400 bar)

• Maximum Speed: 2400 rpm

• Maximum Flow at 1800 rpm: 63 GPM (239 L/min)

• Maximum Power Input: 207 hp (154 kW)

• Control Type: RDFS — Load Sensing + Pressure Compensation composite control

• Control Response: Fast response

• Mounting Flange: SAE D 4-bolt flange

• Shaft: Per A1UV configuration

• Port Locations: Side

• Housing Material: Ductile iron

• Working Fluid: Hydraulic, low-lubricity

• Weight: Approx. 91 kg (200 lbs)

• Through Drive: Available

PVM-025-A1UB-LSFY-P-1NNNN-3:

• Model Code: PVM-025-A1UB-LSFY-P-1NNNN-3

• Series: Oilgear PVM Series (Open Loop, Variable Piston Pump)

• Geometric Displacement: 25.4 cm³/rev (1.55 in³/rev)

• Rated Continuous Pressure: 3750 psi (258.6 bar)

• Peak Pressure: 4250 psi (293.1 bar)

• Maximum Speed: 2700 rpm

• Theoretical Flow at 1800 rpm: 10.1 GPM (38.2 L/min)

• Maximum Power Input at 1800 rpm: 28.8 hp (21.5 kW)

• Control Type: LSFY — Load Sensing + Pressure Compensation control

• Control Response: Medium response

• Mounting Flange: SAE B 2/4-bolt flange

• Shaft: Keyed or splined shaft

• Port Locations: Top/Bottom, Rear

• Housing Material: Ductile iron

• Working Fluid: Hydraulic, low-lubricity

• Weight: Approx. 33.1 kg (73.0 lbs)

• Through Drive: Available

Key Technical Advantages

1. Hard-on-Hard Rotating Group with Contamination Resistance
All three Oilgear series employ a “hard-on-hard” rotating system design, with all friction pair surfaces (cylinder end face running on valve plate, pistons running on swashblock surface) hardened to HRC 60 minimum. This design is suitable not only for traditional mineral oil but also enables reliable operation on low-viscosity fluids such as high water content hydraulic fluids and fire-resistant fluids like Skydrol™, Stack Magic™, and Erifon™, effectively resisting abrasion from particulate contaminants in hydraulic fluid and extending maintenance intervals.

2. Patented Pressure-Lubricated Swashblock Design
The PVWJ and PVM series employ Oilgear’s patented pressure-lubricated swashblock design, forming a stable hydrodynamic oil film between the swashblock and saddle. This design delivers high performance for high-cycling operations while enabling stable operation on low-viscosity media. The integrated polymerous bearings provide infinite bearing life and permit compact design.

3. Static Seal Design for Noise Reduction
The PVWJ series employs static seals (O-rings) instead of traditional gaskets, effectively reducing control noise while eliminating gasket aging and external leakage risks. The optimized droplet-shaped low-noise housing design reduces noise by up to 9 dBA compared to traditional pumps.

4. Extensive Control Options with Field Interchangeability
Oilgear pumps offer multiple control options: single pressure compensated, dual pressure compensated, low pressure compensated, electronic proportional, soft start, high/low pressure compensated, horsepower limiting, and load sensing. The PVWJ series is available with 6 control types, and all control options support field interchangeability, enabling OEMs and system integrators to quickly adapt to different application requirements.

5. Modular Design with Integrated Charge Pump
The PVM series is renowned for its modular design, integrating a charge pump and multiple control modes, with standard SAE-B mounting flange and dual shaft options (straight keyed or splined shaft) enabling flexible adaptation to different drive configurations. The PVK series employs longitudinally-mounted controls for easy adjustment and maintenance in space-constrained installation environments.

6. Superior Volumetric Efficiency with Low Pulsation Output
The PVM series employs an adjustable swashplate for stepless displacement regulation, achieving volumetric efficiency exceeding 92% with extremely low flow pulsation. All three series are equipped with SAE standard mounting flanges and ports, providing high standardization that requires no adaptation for replacement.

Application Areas

• Hydraulic Press Control: Forging equipment, stamping equipment main hydraulic pumps

• Subsea HPUs: Subsea hydraulic power systems for offshore engineering

• Mobile Mining Equipment: Mining truck and LHD hydraulic systems

• Marine Thruster Control: Marine thruster hydraulic control systems

• Aerospace Test Stands: Aerospace testing equipment hydraulic power sources

• Offshore Motion Compensation: Offshore platform motion compensation hydraulic systems

• Mobile Construction Equipment: Excavator, loader, crane hydraulic drives

• Gun Drilling Equipment: Gun drilling machine hydraulic systems

• Industrial Hydraulic Power Units: Large hydraulic power units, central oil supply systems

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness
The Oilgear three-series control spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 4406 18/15/12 or better. Recommended fluids are ISO VG32 or VG46 anti-wear hydraulic oils (mineral oil). Install a 10 μm absolute-rated filter element at the pump inlet. Replace elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first.

2. Low-Viscosity Media Special Precautions
When the system uses high water content hydraulic fluids (HFC), phosphate ester, or Skydrol™ and other low-viscosity/fire-resistant hydraulic fluids, confirm that the pump seal material configuration is compatible (Viton or EPR seal options). Bearing life is reduced under low-viscosity media; consulting Oilgear technical department for confirmation of suitable configurations is recommended when adopting special media.

3. Control Type Commissioning and Maintenance
The PVWJ/PVK/PVM series supports multiple control types (pressure compensation, load sensing, electronic proportional control, etc.). During commissioning, set the pressure cut-off value and flow adjustment range according to actual system requirements. For models equipped with electronic proportional control, regularly inspect proportional solenoid electrical connectors for corrosion, moisture ingress, or loose pins. Verify the control current signal waveform with an oscilloscope every 2,000 hours.

4. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum permissible back pressure is 2 bar. The drain outlet must terminate below oil level at all times to prevent air ingestion. The drain line diameter must not be smaller than the pump case drain port size. For PVK-140 class large displacement pumps, case drain flow is substantial — drain line design must fully account for flow demand.

5. Pre-Start Priming and Air Bleeding
Before first start, fill the pump housing with clean hydraulic fluid through the case drain port. After installation, turn the drive shaft by hand several revolutions to confirm free rotation without binding. Position the control at neutral (zero displacement) and run at low speed for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only then apply load.

6. Through Drive End Maintenance
If equipped with through drive, regularly inspect rear pump mounting bolt tightness and spline connection wear. The through-drive end bearing is lubricated by the pump’s internal case drain circuit — no additional maintenance required. Inspect through-drive end bolt torque at 500 hours after first commissioning, then recheck every 2,000 operating hours.

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