PVWJ-014-A1UV-LSAY-P-1NNNN Oilgear Axial Piston Pump 14.1cc/rev

Product Overview

The PVWJ-014-A1UV-LSAY-P-1NNNN is an Oilgear A-Frame open-loop variable displacement axial piston pump featuring a theoretical maximum displacement of 14.1 cc/rev (0.86 in³/rev), rated continuous pressure of 275 bar (4000 psi), and peak pressure capability of 310 bar (4500 psi). This model is equipped with the P-1NN single pressure compensator control, adjustable from 750 psi (51.7 bar) up to the pump’s maximum pressure rating.

Engineered for cost-effective, stable, and low-maintenance operation, the PVWJ series leverages Oilgear’s proprietary Hard-on-Hard technology — running surfaces hardened to exceed Rockwell 65 — delivering exceptional wear resistance and service life under high-pressure, high-cycle conditions. The series spans three frame sizes and ten displacement ratings, with over 20 control options and multiple porting configurations, providing true field interchangeability for direct replacement of comparable imported pumps without requiring installation or plumbing modifications.

Every PVWJ pump undergoes 100% simulated duty-cycle testing prior to shipment, covering pressure holding, flow output, control response, and internal leakage verification — ensuring reliable field performance from day one.

Technical Specifications

• Model: PVWJ-014-A1UV-LSAY-P-1NNNN

• Brand: Oilgear

• Pump Type: Open-loop variable displacement axial piston pump

• Frame Size: A-Frame (SAE “A” 2-bolt mounting)

• Theoretical Maximum Displacement: 14.1 cc/rev (0.86 in³/rev)

• Rated Continuous Pressure: 275 bar (4000 psi)

• Peak Pressure: 310 bar (4500 psi)

• Maximum Speed: 3600 rpm

• Control Type: P-1NN Single Pressure Compensator (adjustable from 51.7 bar to max rated pressure)

• Flow Rate at 1800 rpm (Rated Continuous): Approx. 22.4 L/min (5.9 gpm)

• Rotation: Left hand

• Seals: Viton

• Shaft: Keyed, 0.75 in. diameter

• Mounting: SAE “A” 2-bolt flange

• Nominal Dimensions (L × W × H): 182.9 × 109.7 × 114.3 mm

• Weight: Approx. 14.5 kg

• Fluid Compatibility: Hydraulic oil, low-lubricity fluids, high water content fluids, fire-resistant fluids (Skydrol™, Stack Magic™, Erifon™, 98/2 glycols)

• Country of Manufacture: United States

Key Technical Advantages

1. Hard-on-Hard Running Surface Technology
   Oilgear’s proprietary Hard-on-Hard technology represents the core engineering advantage of the PVWJ series. Piston-to-shoe surfaces and cylinder-to-valve-plate contact faces are all hardened to exceed Rockwell 65, dramatically improving contamination resistance — particularly critical in high-pressure and low-viscosity fluid applications. This translates to sustained volumetric efficiency over extended service intervals and reduced unplanned downtime.

2. Patented Pressure-Lubricated Swashblock Design
   The PVWJ pump employs Oilgear’s patented pressure-lubricated swashblock, featuring an integrated polymerous bearing lubricated directly by system pressure without a secondary lubrication circuit. This design reduces frictional losses and enables stable operation with low-lubricity media including high water content and fire-resistant hydraulic fluids, significantly broadening the range of compatible operating fluids.

3. Quiet Valve Plate Design
   Static O-ring seals reduce control noise, while the optimized valve plate flow channel design suppresses pressure pulsation and fluid-borne noise. For industrial installations with stringent acoustic requirements — such as indoor hydraulic power units and food-processing equipment — this design delivers measurable operational benefits.

4. Exceptional Field Interchangeability
   The PVWJ family covers 3 frame sizes and 10 displacement ratings with a shared mounting interface standard and control architecture. Within the A-Frame group (011/014/022), mounting dimensions, shaft specifications, and port layouts are identical, enabling rapid drop-in replacement between different displacement pumps within the same frame — minimizing unplanned downtime.

5. Broad Low-Viscosity Fluid Compatibility
   The pump is compatible with HFA/HFB high water content fluids, fire-resistant fluids (Skydrol™, Erifon™, etc.), and 98/2 water-glycol mixtures. Viton seals provide excellent chemical resistance to specialty hydraulic media, making the PVWJ-014 suitable for metallurgy, mining, and aerospace ground support applications where fire resistance is a mandatory requirement.

Application Areas

• Construction Equipment: Open-loop main or auxiliary pumps for excavators, loaders, and cranes

• Agriculture & Forestry: Tractor hydraulic hitch systems, harvester hydraulic drives

• Material Handling: Hydraulic power units for forklifts and telehandlers

• Mining & Offshore: Hydraulic power sources for drilling rigs and anchor winches

• Industrial Hydraulic Power Units: Injection molding machines, die-casting machines, forging equipment

• Specialty Fluid Applications: Continuous casting equipment and aviation ground test systems using high water content or fire-resistant hydraulic fluids

The PVWJ-014 is ideally suited for low-to-medium horsepower applications (14.5 kW / 20 hp class) and hydraulic systems requiring precise pressure-compensated control.

Expert Maintenance Tips

1. Shaft Alignment & Coupling: Maintain concentricity between the pump shaft and drive shaft within 0.05 mm. Flexible couplings are strongly recommended to accommodate minor angular misalignment. Never strike the shaft end during installation — this risks damaging internal seals and bearings.

2. Inlet Pressure & Suction Line Design: The PVWJ-014 requires different minimum inlet pressures depending on speed — 7.0 psia at 1200 rpm and 8.2 psia at 1800 rpm. Use generously sized suction lines (maximum velocity 1.2 m/s) to prevent cavitation. Prime the pump through the case drain port with clean hydraulic fluid before initial startup.

3. Pressure Compensator Setup & Remote Control: The P-1NN control is adjustable from 750 psi (51.7 bar) upward. When implementing remote pressure control, ensure the remote compensator module is set at least 200 psi (13.8 bar) below the pump compensator setting to prevent control interaction.

4. Fluid Cleanliness & Service Intervals: The PVWJ series requires fluid cleanliness of NAS 1638 Class 8 (ISO 4406 18/16/13) or better. Replace filter elements after the first 500 hours of operation, then every 1000–2000 hours depending on duty cycle. When using fire-resistant fluids, shorten oil change intervals and increase fluid sampling frequency due to reduced lubricity.

5. Restart Procedure After Extended Shutdown: If the pump has been idle for more than 30 days, manually rotate the shaft several turns to verify free rotation before restarting. Check for abnormal leakage at the case drain port. After startup, operate at low pressure for 10–15 minutes until oil temperature reaches normal operating range before applying full load.

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