Sunfab SCP & SAP Series Piston Pump | SCP-084R SCP-084L SAP-034 Axial Piston Pump Replacement

Genlu Hydraulic proudly introduces our SCP and SAP Series (comprehensively covering 034 and 084 cc/rev displacements) high-performance bent-axis axial piston fixed displacement pumps. This series is fully engineered as a premium, seamless replacement for the classic Sunfab SCP (heavy-duty cast iron) and SAP (lightweight aluminum body) series truck and industrial high-pressure pumps (including specific identifiers like SCP-084R-N-DL4-L35-SOS-000, SCP-084L-N-DL4-L35-SOS-000, and SCP-034L-N-142-W30-SOS-100). Utilizing a time-tested $45^\circ$ large angle bent-axis profile with spherical-headed pistons, these pumps are tailored purposefully for vehicle Power Take-Off (PTO) environments, such as truck-mounted loader cranes, hooklifts, refuse compactors, and fire trucks. Genlu guarantees 100% Drop-in Interchangeability across standard DIN 5462 (卡车卡槽4孔) vehicle mounting flanges, 8×32×36 involute splined shafts, and SOS port centerlines compared to original Sunfab units. Every pump housing undergoes 100% simulation testing under peak load and overspeed cycles to validate industrial-grade self-priming behavior and volumetric metrics.

Technical Specifications 

• Product Series: Sunfab SCP / SAP Series Bent-Axis Axial Piston Fixed Pumps

• Key Model Formats: SCP-084R-N-DL4-L35-SOS-000, SCP-084L-N-DL4-L35-SOS-000, SCP-034L-N-142-W30-SOS-100

• Displacement Configurations:

  • 034 Frame Size: 34.2 cc/rev (e.g., SAP-034 series)

  • 084 Frame Size: 83.6 cc/rev (e.g., SCP-084 series)

• Nominal Operating Pressure: 35 MPa (350 bar) to 40 MPa (400 bar)

• Peak Circuit Pressure: 45 MPa (450 bar)

• Max Rotation Speeds: 1500 rpm to 2300 rpm (supports short-duration intermittent overspeed running)

• Housing Material Architecture: SCP Variant (Heavy-duty ductile cast iron) / SAP Variant (Lightweight engineered aluminum matrix alloy)

• Mounting Flange & Shaft Profile: DL4 / 142 (DIN 5462 Truck Standard 4-bolt layout with an 8×32×36 involute spline shaft)

• Port Connections: SOS (Truck-standard suction and pressure thread adapters)

• Direction of Rotation: R (Right hand / Clockwise) or L (Left hand / Counter-clockwise, selected based on specific truck gearbox PTO parameters)

Key Technical Advantages:

• Extreme $45^\circ$ Bent-Axis Kinematics: The large $45^\circ$ cylinder tilt angle combined with advanced spherical piston heads offers outstanding mechanical torque balancing. This architecture creates phenomenal self-priming suction power, preventing cavitation even if the pump is situated higher than the vehicle’s static fluid reservoir line.

• Dual Cast Iron Rigidity & Aluminum Lightweight Balancing: The SCP structure is cast from low-temperature resistant ductile iron to endure constant 400 bar workloads easily. Conversely, the SAP series uses high-tensile structural aluminum die-casting, drastically lessening vehicle chassis deadweight and decreasing fleet fuel usage.

• Multi-Layer High-Backpressure Shaft Seals: Built for mobile trucks encountering rough terrain and immediate backpressure changes, the assembly mounts dual Viton shaft oil seals. Backed by internal cooling relief channels, the seal arrangement easily withstands case pressures up to 400 kPa without dynamic weeping.

• Spherical Valve Plate Centering Geometry: The contact boundary between the cylinder barrel and the valve plate utilizes a micro-ground spherical match, treated with a hard wear-resistant alloy overlay. This delivers automated self-centering and wear compensation, completely eliminating galling or lockups during cold-start high-viscosity spiking.

Application Areas:

• Truck Hydraulics & Vehicle Conversions: Truck-mounted knuckleboom cranes, timber log loaders, heavy recovery rollbacks, and dump truck high-pressure hoist linkages.

• Municipal Special Operations Fleets: Airport vacuum sweepers, high-reach aerial work platforms, and high-pressure sewer jetting combi-trucks.

• Forestry & Waste Management Support: Hooklift garbage container handlers, municipal refuse collectors, and heavy forestry forwarder power blocks.

Expert Maintenance Tips:

• Verify R vs. L Rotation Coding (Critical Truck Protocol): Truck gearbox PTO output shafts spin differently based on transmission engineering (clockwise or counter-clockwise). Prior to installing an SCP-084R (Right Hand) or SCP-084L (Left Hand), explicitly check the PTO rotation. Hooking a pump up backwards prevents fluid draw, causing the spherical pistons to fracture from dry friction within seconds.

• Enforce Full-Diameter Suction Plumbing: The 084 scale pump draws massive fluid volume when the truck engine revs high. The SOS intake port must use a thick-walled, steel-reinforced suction hose that matches the full port width. Never install restrictive step-down reducers, which cause severe vacuum cavitation and destroy the inner barrel.

• Execute Low-Speed Priming Air Bleeds: Upon bolting the replacement pump, fill the casing with highly filtered fluid. When activating the truck PTO for the first time, keep the engine running at low idling speed for 1-2 minutes. Do not ramp up throttle until the air pockets bleed back to the reservoir and the line noise levels drop smoothly.