Product Overview
The PAVC33, PAVC38, PAVC65, and PAVC100 belong to the Parker PAVC Series of medium-pressure, super-charged variable displacement axial piston pumps. Featuring swashplate design for open-circuit applications up to 3,000 PSI (210 bar), every pump undergoes 100% simulated load testing at the factory, covering pressure hold, flow response, and control valve dynamics for reliable operation in both mobile and industrial hydraulic systems.
The PAVC Series is distinguished by its built-in supercharger, sealed shaft bearing, two-piece housing design, and field-changeable cartridge-type controls. The PAVC100 additionally supports thru-shaft capability for tandem pump configurations. Our products are manufactured to original Parker technical specifications with full drop-in interchangeability — no piping or mounting flange modifications required for replacement.
Technical Specifications
Series: Parker PAVC Series
Design: Swashplate axial piston variable pump, open circuit
Displacement: 33 cc/rev (PAVC33) / 38 cc/rev (PAVC38) / 65 cc/rev (PAVC65) / 100 cc/rev (PAVC100)
Rated Operating Pressure: 207 bar (3,000 PSI) — all models
Maximum Speed: 3,000 rpm (PAVC33/38/65); 2,600 rpm (PAVC100)
Control Options: Pressure compensation (standard); load sensing, power (torque) limiting, power and load sensing, remote pressure compensation, adjustable maximum volume stop, electrohydraulic flow and pressure, low pressure standby
Housing Material: High-strength cast iron
Port Plate: Replaceable bronze clad port plate
Shaft Bearing: Sealed shaft bearing
Cylinder Barrel Bearing: Hydrodynamic cylinder barrel bearing
Mounting: SAE standard flange
Direction of Rotation: Clockwise or counterclockwise available
Fluid Compatibility: Standard hydraulic fluids, phosphate ester, water glycol (full pressure rating)
Filter/Cool Drain Line Max Pressure: 7 bar (100 PSI)
Weight Range: 18–50 kg
Noise Level: ≤79–85 dB(A) depending on model and conditions
Thru-Shaft Capability: PAVC100 only
Model Code Interpretation (Examples):
PAVC1009B2L46B3A22: PAVC100 displacement, 9B2 mounting/shaft variant, L46 port configuration, B3A22 control and option code. The control option corresponds to power limiting or compound control configuration, suitable for mobile machinery main pump applications requiring torque protection.
PAVC65W2R4A11: PAVC65 displacement, W2 mounting/shaft variant, R4 rotation and port layout, A11 control code for standard pressure compensation configuration.
PAVC10038R4222: PAVC100 displacement, 38 as derivative code, R4 rotation direction, 222 control and option code. This model supports thru-shaft capability for tandem pump configurations.
Data based on Parker PAVC Series technical documentation (Catalog HY28-2662-CD/US). The 207 bar rated pressure is uniform across the series.
Key Technical Advantages
1. Built-In Supercharger for High-Speed Capability
The defining engineering feature of the PAVC Series is its built-in supercharger. This structure pre-pressurizes the pump inlet, ensuring adequate suction filling at speeds up to 3,000 rpm (2,600 rpm for PAVC100) while preventing cavitation and flow pulsation. For applications where the pump is driven directly by an engine or electric motor at high speed, this design significantly extends the usable speed range, delivering measurably higher volumetric efficiency than non-supercharged equivalents.
2. Cartridge-Type Controls — Field Changeable
All control valves in the PAVC Series utilize cartridge-type design, allowing controllers to be replaced or upgraded on-site without disassembling the pump housing. This design dramatically improves maintenance and retrofit efficiency, reducing downtime and service costs. Available control options span from simple pressure compensation to load sensing, power limiting, and combined power/load-sensing configurations, covering applications from basic constant-pressure systems to complex load-matching circuits.
3. Two-Piece Housing and Bronze Clad Port Plate
The pump body features a two-piece cast iron housing, bolted front-to-rear for ease of disassembly and service. The port plate is a replaceable bronze clad design, offering superior wear and anti-galling performance that extends the service life of critical friction pairs. The cylinder barrel is supported by a hydrodynamic bearing that generates a fluid film at high speed, minimizing metal-to-metal contact and wear.
4. Water Glycol Full Pressure Rating and Thru-Shaft Capability
The PAVC Series achieves full rated pressure operation on most water glycol fluids, with the pump case and shaft seal subjected only to inlet pressure. This makes the series suitable for steel mills, power plants, and other environments where fire-resistant hydraulic fluids are mandatory. The PAVC100 additionally supports thru-shaft capability, enabling direct tandem mounting of a rear pump within a compact installation envelope.
Application Areas
Mobile Machinery: Loader work equipment hydraulics, forklift lift and tilt circuits, compact excavator auxiliary circuits, municipal vehicle upper-body hydraulic drive
Industrial Hydraulic Power Units: Injection molding machine hydraulic power units, machine tool hydraulic systems, press main drives
Steel Mills & Power Plants: Hydraulic stations using water glycol fluids, metallurgical equipment hydraulic drives, power plant auxiliary hydraulic systems
Material Handling: Port machinery hydraulic drives, conveyor hydraulic power units
Specialty Vehicles: Refuse vehicle hydraulic systems, aerial work platform hydraulic drives
Expert Maintenance Tips
Pre-Installation Cleanliness Control: Before installing PAVC Series pumps, verify system cleanliness meets ISO 4406 18/16/13 or better. Port plugs should be removed and piping connected immediately after unboxing — environmental exposure should not exceed 15 minutes. Before first start, fill the pump case with clean hydraulic oil to the highest level the inlet port will allow. Dry-start is strictly prohibited. Avoid rigid connection between the pump and reservoir cover or frame to prevent pump vibration from exciting the entire system.
Pressure Compensator Calibration: The PAVC 33/38/65 ships with a standard differential pressure setting of 10 bar (150 PSI); the PAVC100 is set at 21 bar (300 PSI). To verify or adjust: install a 0–207 bar gauge in the OUTLET (not the low-signal “B” port) and back the pressure compensator adjustment fully counterclockwise. The gauge should read 22–26 bar for PAVC 33/38/65 and 34–40 bar for PAVC100. If readings differ, adjust via the differential adjustment knob (Option 4) or add/remove shims until the correct pressure is reached.
Oil Maintenance Schedule: Replace hydraulic oil and filter after the first 500 hours. Thereafter, replace every 2,000 hours or 12 months, whichever comes first. The maximum filter and/or cool drain line pressure is 7 bar (100 PSI); exceeding this value may damage case seals. When using water glycol fluids, periodically test fluid concentration and pH to ensure they remain within recommended ranges.
Long-Term Storage Protection: For pumps stored over 3 months, drain case oil, fill with rust-preventive oil, and plug all ports. Before recommissioning, flush with flushing oil for 30 minutes and confirm flushing oil cleanliness meets specification before connecting to the system. Always refill the case to the highest level the inlet port allows before restart.
