Nachi PVD-2B-45P-18G6A-4891F 208-1112 hydraulic pump for Caterpillar 305CR mini excavator
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Complete Hydraulic Pump Assembly
Pump Shaft Side View
Internal Repair Components
1. OEM Part Number & Machine Compatibility
Original pump model: Nachi PVD-2B-45P-18G6A-4891F tandem variable displacement axial piston pump assembly
Caterpillar OEM interchange part numbers: 208-1112, 288-6857
Exact compatible mini excavator model: Caterpillar CAT 305CR (Equipped with Mitsubishi K4N engine)
Two part numbers are iterative supersession upgrade codes, identical mounting flange, input spline shaft, hydraulic port layout and internal hydraulic calibration; fully cross-replaceable direct bolt-on aftermarket replacement without pipeline or frame modification
2. Core Technical Specifications
Structure type: Dual variable axial piston main pump (first stage + second stage) integrated with built-in pilot charge gear pump
Displacement per main pump: 45 cm³/rev, perfectly matched to factory load-sensing hydraulic system of CAT 305CR 5-ton compact excavator platform
Second Stage Specified Parameters
Rated working pressure (second stage): 26.5 MPa
Maximum relief pressure (second stage): 29.0 MPa
Rated operating speed (second stage): 2400 rpm
Corresponding rated input power (second stage): 33.6 kW
Working speed range precisely calibrated to match rated output of original Mitsubishi K4N engine
Mounting bolt layout, input shaft spline dimension and hydraulic port positioning strictly comply with CAT OEM dimensional drawings
Pump housing adopts high-strength ductile iron; internal pistons, valve plates and friction wear components use quenched wear-resistant alloy steel to extend service lifespan
3. Internal Structure & Functional Introduction
Dual main piston pumps generate high-pressure hydraulic oil to drive boom, arm, bucket, travel and swing compound working movements
Integrated pilot gear pump supplies stable pressurized oil for pilot control circuits and system hydraulic oil replenishment
Built-in load-sensing power regulator automatically adjusts pump flow output responding to real-time load changes, preventing engine stall under heavy digging and loading conditions
Compact tandem integrated layout fits neatly inside the limited hydraulic compartment space of CAT 305CR zero-tail mini excavator
4. Product Advantages
Exact 1:1 OEM outer casting dimensions, supporting plug-and-play installation with no modification required for hydraulic pipelines or engine mounting structure
Every finished pump undergoes comprehensive hydraulic bench inspection including pressure stability, flow uniformity and internal leakage testing before shipment
Complete maintenance spare parts are kept in stock, including overhaul seal kits, piston assemblies, swash plates and valve plates for separate component replacement during overhaul work
Two interchangeable OEM numbers dedicated for CAT 305CR, simplifying spare part ordering and inventory management for suppliers and repair service centers
Standard 12-month full warranty for aftermarket unit, stable performance comparable to genuine original Nachi hydraulic pump
5. Packaging & Global Delivery Details
Input shaft and all hydraulic ports are coated with anti-rust grease and sealed with protective dust plugs
The entire pump is wrapped with moisture-proof plastic film and secured inside export-grade solid wooden crate to avoid collision and moisture corrosion during long-distance sea or air transportation
In-stock items can be dispatched within 3 to 5 working days after order confirmation
Multiple global shipping solutions are available: international air express, sea LCL/FCL bulk shipment and overland truck transportation for global customers
6. FAQ
Q: Are 208-1112 and 288-6857 mutually interchangeable?
A: Yes, these two part numbers are iterative updated replacement codes for the same Nachi PVD-2B-45P-18G6A-4891F pump assembly, fully cross-replaceable for CAT 305CR.
Q: Can this pump install directly on CAT 305CR?
A: Yes, unified mounting sizing and factory-calibrated hydraulic settings enable direct bolt-on fitting for CAT 305CR with no extra adjustment or modification work needed.
Q: What is the relation between PVD-2B-45P-18G6A-4891F and these CAT OEM part numbers?
A: PVD-2B-45P-18G6A-4891F is the official Nachi original pump model designation, while 208-1112 and 288-6857 are exclusive OEM part numbers assigned by Caterpillar for this complete main pump assembly.
Q: Are individual repair spare parts available for this hydraulic pump?
A: Corresponding full overhaul seal kits, piston shoe assemblies, valve plates, swash plates and standalone pilot gear pump spare parts are all available for partial overhaul and single component replacement work.