Product Overview
The PVWJ-076-A1UV-RDSF is an Oilgear PVWJ Series C-Frame open-loop variable displacement axial piston pump with a theoretical maximum displacement of 76.5 cc/rev (4.67 in³/rev), rated continuous pressure of 241 bar (3500 psi), peak pressure capability of 276 bar (4000 psi), maximum speed of 2400 rpm, output flow of approximately 127.7 L/min (33.7 gpm) at 1800 rpm, drive power of approximately 60 kW (80.4 hp) at rated conditions and 1800 rpm, and weight of approximately 46.8 kg. The model features RDSF pressure compensator control with an SAE “C” two-bolt mounting flange, suitable for low-to-medium horsepower industrial hydraulic systems.
The PVWJ Series is designed around cost-effectiveness, stability, and low maintenance requirements, featuring medium control response and specifically engineered for low-viscosity hydraulic media. The series covers three frame sizes and ten displacement ratings (10.8–130.2 cc/rev), offering multiple control and porting options with exceptional field interchangeability. All Oilgear PVWJ pumps feature hardened running surfaces — including cylinder-to-valve plate contact and piston-to-shoe surfaces — ensuring wear resistance and long service life under high-pressure and low-viscosity fluid conditions.
Companion models include the PVWJ-022-A1UV-RSAS A-Frame pump (22.1 cc/rev, 207 bar rated, 3600 rpm max, weight approx. 14.5 kg) and the PVWJ-098-A1UV-LSAY-P-1NNNN C-Frame pump (98.3 cc/rev, 172 bar rated, 2400 rpm max, LSAY load sensing control, weight approx. 46.8 kg).
Every PVWJ pump undergoes 100% simulated duty-cycle testing prior to shipment — covering pressure holding, flow output, control response, and internal leakage — ensuring complete drop-in interchangeability with original Oilgear pumps without installation or plumbing modifications.
Technical Specifications
PVWJ-076-A1UV-RDSF Main Model Specifications:
Model: PVWJ-076-A1UV-RDSF
Brand: Oilgear
Series: PVWJ Series C-Frame
Pump Type: Open-loop variable displacement axial piston pump
Theoretical Maximum Displacement: 76.5 cc/rev (4.67 in³/rev)
Rated Continuous Pressure: 241 bar (3500 psi)
Peak Pressure: 276 bar (4000 psi)
Maximum Speed: 2400 rpm
Minimum Speed: 600 rpm
Flow at 1800 rpm (Rated): Approx. 127.7 L/min (33.7 gpm)
Drive Power at 1800 rpm, Rated Pressure: Approx. 60 kW (80.4 hp)
Control Type: RDSF pressure compensator control
Mounting Flange: SAE “C” 2-bolt flange
Dimensions (L × W × H): 265.2 × 171.7 × 182.4 mm
Weight: Approx. 46.8 kg
Case Drain Port: #12 SAE straight thread
Minimum Inlet Pressure (1800 rpm): 9.6 psia (0.66 bar abs.)
Fluid Compatibility: Hydraulic oil, low-lubricity fluids, high water content fluids, fire-resistant fluids (Skydrol™, Stack Magic™, Erifon™, 98/2, etc.)
PVWJ Series C-Frame Same-Family Displacement Reference:
PVWJ-064: 63.6 cc/rev (3.88 in³/rev), 345 bar rated, 400 bar peak, 2700 rpm max, weight approx. 46.8 kg
PVWJ-076: 76.5 cc/rev (4.67 in³/rev), 241 bar rated, 276 bar peak, 2400 rpm max, weight approx. 46.8 kg
PVWJ-098: 98.3 cc/rev (6.00 in³/rev), 172 bar rated, 207 bar peak, 2400 rpm max, weight approx. 46.8 kg
PVWJ-130: 130.2 cc/rev (7.94 in³/rev), 103 bar rated, 138 bar peak, 2100 rpm max, weight approx. 46.8 kg
Companion Model Reference:
Model: PVWJ-022-A1UV-RSAS
Series: PVWJ Series A-Frame
Theoretical Maximum Displacement: 22.1 cc/rev (1.35 in³/rev)
Rated Continuous Pressure: 207 bar (3000 psi)
Peak Pressure: 241 bar (3500 psi)
Maximum Speed: 3600 rpm
Flow at 1800 rpm (Rated): Approx. 36 L/min (9.5 gpm)
Weight: Approx. 14.5 kg
Model: PVWJ-098-A1UV-LSAY-P-1NNNN
Series: PVWJ Series C-Frame
Theoretical Maximum Displacement: 98.3 cc/rev (6.00 in³/rev)
Rated Continuous Pressure: 172 bar (2500 psi)
Peak Pressure: 207 bar (3000 psi)
Maximum Speed: 2400 rpm
Flow at 1800 rpm (Rated): Approx. 164 L/min (43.3 gpm)
Control Type: LSAY load sensing + pressure compensator control
Weight: Approx. 46.8 kg
Key Technical Advantages
1. Hard-on-Hard Running Surface Technology — Exceptional Contamination Resistance
The core engineering advantage of the Oilgear PVWJ Series lies in its proprietary Hard-on-Hard running surface technology. The cylinder-to-valve plate contact surfaces and piston-to-shoe surfaces are all hardened, delivering running surface hardness far exceeding standard levels. This design provides the PVWJ-076-A1UV-RDSF with exceptional wear resistance and contamination tolerance under high-pressure and low-viscosity fluid conditions, significantly extending overhaul intervals. For systems using high water content or fire-resistant hydraulic fluids, the Hard-on-Hard technology is essential for ensuring long-term stable pump operation.
2. Patented Pressure-Lubricated Swashblock Design — Stable Operation with Low-Viscosity Media
The PVWJ Series employs Oilgear’s patented pressure-lubricated swashblock design, featuring an integrated polymerous bearing lubricated directly by system pressure without a secondary lubrication circuit. This design not only reduces frictional losses but also enables stable operation with low-lubricity media including high water content (HFA/HFB) and fire-resistant fluids (such as Skydrol™, Stack Magic™, Erifon™, and 98/2 glycol solutions), significantly broadening the range of compatible operating fluids.
3. Medium Control Response — Fast Dynamic Adjustment
The PVWJ-076-A1UV-RDSF delivers medium control response, with an on-stroke response time of approximately 200 ms and off-stroke response time of approximately 200 ms at 1800 rpm and rated conditions. The RDSF pressure compensator control automatically adjusts the swashplate angle through pressure feedback, achieving constant pressure variable operation, with pressure adjustment from 750 psi (51.7 bar) up to the pump’s maximum pressure rating. This control method offers simple construction and low failure rate, particularly suitable for industrial hydraulic systems requiring stable pressure output.
4. Modular Frame Design — Flexible Field Interchangeability
The PVWJ Series covers three frame sizes (A, B, C) and ten displacement ratings, all sharing a common mounting interface standard and control option system. Within the C-Frame group (064/076/098/130), 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. The modular control cover design supports rapid replacement and upgrade of control modes without pump disassembly.
5. Low Noise Operation and Structural Reliability
The PVWJ Series employs static seal (O-ring) construction replacing traditional gasket seals, effectively reducing control noise while simplifying seal maintenance. The pump housing is constructed from high-strength cast iron with sealed front shaft bearings permitting side loading. The series also supports through-shaft (Thru-Shaft) configuration for tandem connection of multiple pumps in compact multi-circuit hydraulic systems.
Application Areas
Low-to-Medium Power Industrial Hydraulic Power Units: Injection molding machine auxiliary circuits, die-casting machine auxiliary systems, machine tool hydraulic power units
Construction Machinery: Auxiliary hydraulic circuits for medium excavators, loaders, and cranes
Mining and Offshore Equipment: Drill rig auxiliary systems and anchor winch hydraulic power sources
Material Handling Equipment: Hydraulic power units for medium forklifts and telehandlers
Specialty Fluid Applications: Continuous casting equipment and aviation ground test systems using high water content or fire-resistant hydraulic fluids
Agricultural Machinery: Tractor hydraulic hitch systems and auxiliary hydraulic circuits
Marine Auxiliary Equipment: Deck machinery and steering gear hydraulic systems
The PVWJ-076-A1UV-RDSF is ideally suited for low-to-medium power hydraulic systems requiring 241 bar continuous working pressure and displacements in the 60–100 cc/rev range — the classic configuration for industrial hydraulic power units and construction machinery auxiliary hydraulic circuits.
Expert Maintenance Tips
1. Shaft Alignment and Coupling Requirements
Maintain concentricity between the pump shaft and drive shaft within 0.05 mm. Flexible couplings are strongly recommended to accommodate minor angular misalignment. The PVWJ-076-A1UV-RDSF features an SAE C two-bolt mounting flange; tighten mounting flange bolts in diagonal sequence to the specified torque. Valve plate screw torque is 56 ft-lbs (76 N·m) and SAE C tandem mounting screw torque is 74 ft-lbs (100 N·m). Never strike the shaft end during installation to avoid damaging internal seals and bearings.
2. Pre-Start Priming Procedure
Before initial startup, the pump must be slowly filled through the case drain port with clean hydraulic oil. Oilgear PVWJ Series explicitly specifies: fill the case with fluid before starting, arrange the case drain line to keep the case full of fluid at all times, and use a minimum of bends returning the case drain line to the reservoir below minimum fluid level. Start the pump in jog mode until the pump and piping are sufficiently filled and vented.
3. Case Drain and Plumbing Requirements
The case drain line should be independently routed to the reservoir, avoiding shared return lines. The PVWJ-076 case drain port is #12 SAE straight thread with a minimum drain line inside diameter of 0.75 in. (19 mm). Case drain backpressure must not exceed permissible limits. Pump orientation is not restricted, but the case drain must be arranged to keep the case full of fluid at all times.
4. Fluid Cleanliness and Filtration
The PVWJ Series requires fluid cleanliness of ISO 4406 21/19/16 or better. Oilgear does not recommend suction line filtration, as excessive pressure drop across the filter can starve the pump; return line filtration is the preferred method. System and pumps must be protected against overloads with high pressure relief valves; peak pressure is the maximum pressure the unit can be operated at for 1% or less of every minute.
5. Low-Viscosity Fluid Application Notes
When using high water content or fire-resistant fluids, the minimum allowable viscosity is 31 SSU (approx. 1 cSt) and maximum allowable viscosity is 2000 SSU (approx. 450 cSt). Pumps for low-viscosity applications incorporate a Nitrile shaft seal and a special shoe retainer. The minimum pilot pressure to destroke the pump is 200 psi (13.8 bar). When supercharging, maximum allowable inlet pressure is 100 psi.
