Vickers 35VQ Vane Pump | 35VQ38A 35VQ30A Hydraulic Pump Replacement

Genlu Hydraulic stands as a premier enterprise in the precision engineering, advanced component metallurgy, and global supply of heavy-duty, high-pressure industrial and mobile hydraulic vane pumps and cartridge sub-assemblies. The VQ Series Heavy-Duty Intravane Hydraulic Pump is purpose-built as a rugged, high-volumetric-efficiency, and 100% drop-in interchangeable alternative to the mobile fluid power industry benchmark—the Eaton Vickers classic VQ series collections. We support complete, ready-to-ship supply constraints for all single and thru-drive double pump assemblies across 20VQ, 25VQ, 35VQ, and 45VQ frame sizes, maintaining deep inventory reserves for highly requested field configurations such as 35VQ38A86A20, 35VQ-38A-1C-10R, 35VQ-30A-1D-10R, and 35VQ-30A-1B-10R.

Operating as the primary power muscle for mobile truck cranes, transit concrete mixers, specialized drilling rigs, and heavy municipal environmental fleets, a mobile vane pump must sustain peak volumetric limits at high velocities under continuous pressures up to 210 bar. Genlu’s 35VQ series vane pumps conform precisely to original engineering manuals and manufacturing standards. We guarantee flawless mechanical interchangeability across standard SAE mounting flanges, drive shaft profiles (straight keyed or splined variants), port center-to-center distances, and the precision-machined “Cartridge Kit” internal rotary geometries. Prior to shipping clearance, every pump assembly undergoes 100% Full-Simulation Condition Testing on digitized testing systems to ensure optimal displacement stability and ultra-low noise signatures under maximum load.

Technical Specifications 

• Product Line: VQ Series High-Pressure Intravane Hydraulic Pump (Fully compatible with Vickers VQ platforms)

• Core Covered Specific Configurations:

  • 35VQ38A86A20 Layout (35VQ frame, 38 displacement code, specialized SAE A mounting variant)

  • 35VQ-38A-1C-10R Layout (35VQ frame, 38 displacement code, straight keyed shaft, clockwise rotation, design series 10)

  • 35VQ-30A-1D-10R Layout (35VQ frame, 30 displacement code, standard splined shaft, clockwise rotation, design series 10)

  • 35VQ-30A-1B-10R Layout (35VQ frame, 30 displacement code, variant straight keyed shaft, clockwise rotation, design series 10)

• Geometric Displacement Metric Groupings:

  • Displacement Code 30: 95.0 $cc/rev$

  • Displacement Code 38: 121.0 $cc/rev$ (Comprehensive platform spans 20VQ to 45VQ volumetric envelopes)

• Maximum Continuous Operating Pressure: Rated up to 210 bar (21.0 MPa / 3000 psi) steady-state duty

• Permissible Driving Rotational Velocity Envelope: From 600 rpm (Minimum speed threshold for vane seating) up to 2200 rpm (Maximum rated velocity limits)

• Rotational Direction Suffixes: R (Clockwise configuration, viewed looking directly at the shaft end); L (Counter-Clockwise configuration)

• Main Fluid Connection Ports: Standard SAE 4-bolt split flange interfaces (typically 3″ SAE suction flange paired with 1-1/4″ SAE high-pressure discharge outlet)

• Drive Shaft Profile Designations:

  • Code 1: Straight Keyed Shaft Profile

  • Code 11: Heavy-Duty Involute Splined Shaft (Optimized for direct coupling onto diesel engine PTO drives)

• Total Pump Dry Assembly Mass: Approximately 31.0 kg (High power-density structural layout)

Key Technical Advantages:

• Classic Intravane Geometry with Precision Pressurized Sealing: The core cartridge contains high-spec intravane elements where a secondary pin/vane is nested inside the primary blade. As system pressure spikes, pressurized oil is internally routed to the blade root area, balancing the tracking force of the vane tip against the cam ring’s inner contour. This configuration delivers micro-scale sealing and lowers localized friction wear compared to standard single-vane variants, keeping volumetric efficiency high over extended operating hours.

• Fully Hydraulically Balanced Internal Core Layout: The pump housing interior features an dual-symmetric inlet and outlet chamber geometry. The fluid radial pressure zones acting on the rotor shaft are completely counter-balanced. This balanced design eliminates fluid-induced radial loads on the internal bearings, allowing the drive shaft to retain precise runout alignment and extending mechanical bearing life under continuous 210 bar load spikes.

• Modular Drop-In Quick-Change Cartridge Kit Maintenance Model: All high-velocity internal wear components—including the cam ring, rotor, intravanes, bi-metal distribution plates, and critical sealing elements—are contained within an independent, pre-assembled cartridge module. If contamination wear occurs in the field, service technicians can perform a complete drop-in cartridge rebuild in under 10 minutes without disconnecting the primary pump plumbing.

• Flexible Bi-Metal Side Plates for Severe Cold-Start Operation: The internal rotary group is bordered by flexible bi-metal side plates composed of a structural steel backing bonded to a premium bronze alloy face. Precision-machined micro-involute relief grooves automatically modulate end-play clearances via hydrostatic balancing. This design dampens fluid pulsation noise (keeping total operating sound levels below 68 dB) and provides scuffing resistance during winter cold-starts.

Application Areas:

• Mobile Municipal & Environmental Fleets: Central multi-spool hydraulic power plants for heavy-duty refuse compaction trucks and road sweeping machinery.

• Mobile Construction Engineering & Truck Rigs: Transit concrete mixer drum drive loops, materials transport tipping systems, and truck-mounted geotechnical core exploration drill rigs.

• High-Frequency Industrial Processing Power Packs: Auxiliary circuit supplies for plastics extrusion lines and conveyor feed systems on recycling scrap shears.

Expert Maintenance Tips:

• Verify Rotation Suffixes and Physical Port Orientation Angles Prior to Mounting: Vickers VQ pump codes (such as the R rotation and the C positioning modifier in 35VQ-38A-1C-10R) must be cross-referenced carefully. The letter R designates clockwise shaft rotation, while the modifiers A/B/C/D specify the outlet port positioning relative to the suction inlet (0°, 90°, 180°, and 270° angles respectively). Verify that the new unit matches the old configuration exactly to avoid putting structural twist stress on heavy fluid lines.

• Adhere to the Low-Speed Operational Threshold (Never Operate Below 600 RPM): Intravane pumps rely on centrifugal force and root back-pressure to extend the vanes out of the rotor slots to seal against the inner cam contour. If the engine or motor spins below the 600 rpm threshold at startup, the vanes will not seat correctly. This causes fluid bypass and dry friction, which can score the rotor and cam ring. When starting a newly installed pump, use short, high-rpm engine bumps (2-3 seconds) to immediately prime the core.

• Strict Fluid Cleanliness Auditing and Suction Cavity Air Isolation: VQ series pumps operate in demanding mobile environments and are sensitive to abrasive particulate contamination. Maintain hydraulic oil filtration to a minimum ISO 4406 19/16 or NAS 9 cleanliness standard. Additionally, given the large 3″ SAE inlet flange, ensure the suction line seals are tight; even minor air leaks introduce air bubbles that implode under high discharge pressures, causing honeycomb cavitation damage on the cam ring.

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