720-2M-00050 hydraulic pump for Komatsu D31EX-21 D31PX-21 D37PX-21 D37EX-21 Bulldozer construction equipment
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OEM Part Nos: 720-2M-00050, 720-2M-00031, 720-2M-00032Fits: D31EX-21, D31PX-21, D37EX-21, D37PX-21 (HST bulldozer)
1. Pump Type & Specifications
Type: HST Hydrostatic Main Pump (HPV63+63)
Displacement: 63 cm³/rev × 2 (tandem)
Rated Pressure: 32 MPa (320 bar)
Drive: Engine-driven, closed-loop HST system
Weight: ~157 kg (346 lbs)
Material: High-strength alloy housing, hardened gear set
2. Compatible Models & Serial Numbers
Model Serial No.
D31EX-21 50001–UP
D31PX-21 50001–UP
D37EX-21 5501–UP
D37PX-21 5501–UP
3. Part Number Reference
720-2M-00050: Full pump assembly (current main PN)
720-2M-00031: Original assembly (superseded by 00050)
720-2M-00032: Alternative OEM assembly
4. Key Features
Genuine Komatsu quality, direct replacement, no modification needed
Tandem HPV63 design delivers high torque and smooth HST control
Heavy-duty bearings & seals for long life in harsh construction sites
Closed-loop hydrostatic system for precise, responsive dozer operation
5. Supply & Warranty
Condition: New genuine / high-quality remanufactured
Warranty: 12 months (unlimited hours)
Stock: Guangzhou warehouse in stock, ships in 1–3 days
Packaging: Export wooden crate, anti-rust treatment
6. FAQ
Q: Can I use this pump for both D31 and D37-21?
A: Yes, it is 100% interchangeable across all four models listed.
Q: What’s the difference between 720-2M-00031 and 720-2M-00050?
A: 00050 is the latest updated OEM part number, superseding the older 00031; functionally identical.
Q: Do you offer repair kits or spare parts for this pump?
A: Yes, we provide seal kits, bearing sets, piston groups, and valve plates for overhaul.