Rexroth AP2D12 OEM 6688051 hydraulic pump for Bobcat 425 428 ZTS mini excavator
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1. Product Overview
The AP2D12LV3RS7 is a dual-output variable displacement axial piston pump designed for compact machines requiring high power density. As the primary pump for the Bobcat 425 and 428 series, it provides the precise flow and high-pressure output needed to manage the complex hydraulic demands of a Zero Tail Swing excavator. Its integrated design ensures that the boom, arm, and bucket functions remain responsive and powerful, even during simultaneous travel, without taxing the engine's RPM.
2. Technical Specifications & OEM Part Numbers
This unit is a 100% direct "bolt-on" replacement for Bobcat factory part numbers and original manufacturer specifications.
Bobcat Part Number: 6688051
Manufacturer Model: AP2D12LV3RS7 (Rexroth/Uchida style)
Machine Fitment:
Bobcat 425 ZTS (Zero Tail Swing)
Bobcat 428 ZTS (Zero Tail Swing)
Core Features:
Pump Type: Variable Displacement Axial Piston Pump.
Control System: Integrated load-sensing and pressure-limiting valves to optimize fuel efficiency and prevent hydraulic overheating.
Compact Design: Specifically engineered to fit within the narrow engine compartments of ZTS models.
Durability: Features high-grade internal components, including hardened piston shoes and specialized valve plates for extended service life in high-cycle applications.
3. Why Partner With a 13-Year Industry Expert?
Technical Precision: We specialize in AP2D series pumps and understand the exact regulator calibrations required for Bobcat machines. Our pumps restore the original "factory-feel" to your joystick controls and cycle speeds.
Rigorous Bench Testing: Every unit undergoes a comprehensive 100% hydraulic performance test. We verify volumetric efficiency, flow-to-pressure curves, and seal integrity under maximum load before shipping.
Factory-Direct Value: Access Original New or Premium OEM-spec units at competitive wholesale prices, bypassing the significant markups of local retail dealerships.
Global Rapid Logistics: Units are secured in reinforced, shock-proof export packaging. We offer express delivery via DHL, FedEx, or UPS, typically arriving in 3 to 7 business days.
4. Critical Installation & Maintenance Protocol
Case Priming (Non-Negotiable): You must fill the pump housing with clean hydraulic oil through the highest drain port before starting the engine. Running the pump "dry" for even a few seconds will cause immediate catastrophic failure of the internal components.
System Decontamination: If the previous pump failed mechanically (sending metal debris into the system), you must flush the entire hydraulic tank, main control valve, and oil cooler. Residual debris is the leading cause of failure for replacement pumps.
Filter Change: Always install a new high-efficiency hydraulic return filter and suction strainer during the pump replacement to maintain oil cleanliness and protect the precision-lapped surfaces.
5. Ordering & Professional Support
Fitment Verification: To ensure 100% accuracy, please provide your Machine Serial Number or a photo of your existing pump’s nameplate.
Instant Quote: Contact us today for up-to-date pricing, tiered quality options (Original New vs. Premium Replacement), and current stock availability.
Technical Guidance: Our expert team is available 24/7 to provide professional advice on installation, air bleeding, and hydraulic troubleshooting.