CAT 1838446 (183-8446) Barrel As | Fits D8R D8R II 621G 627G 631G 637G
CAT 1838446 (183-8446) Barrel As | Fits D8R D8R II 621G 627G 631G 637G
In Stock & Ready for Global Express Dispatch
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Premium hydraulic piston pump barrel assembly (cylinder block) designed as a direct OEM-compatible replacement for Caterpillar (CAT) heavy equipment. Precision-engineered to overhaul main hydraulic pumps, restoring accurate piston stroke alignment, smooth fluid displacement, and high-pressure performance under demanding earthmoving and forestry conditions.
Product Highlights
- Part Number: 1838446 / 183-8446
- Direct Fit OEM Replacement: Internal bore tolerances, spline specifications, and sealing face dimensions match original Caterpillar engineering standards perfectly for seamless pump rebuilding.
- Heavy-Duty Construction: Manufactured with high-grade alloy steel and heat-treated internal surfaces to resist severe friction, internal scoring, and continuous high hydraulic pressure.
- Cost-Effective Overhaul Solution: Restores full main pump flow rate, system pressure capacity, and machine cycle efficiency back to OEM standards at a fraction of the cost of replacing the entire pump assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 1838446 / 183-8446 |
| Product Type | Piston Pump Barrel Assembly / Cylinder Block |
| Brand Compatibility | Caterpillar (CAT) |
| Application | Main Hydraulic Pump Maintenance & Overhaul |
| Material | High-Strength Precision Alloy Steel |
| Warranty | 12 Months Warranty |
Compatible Models & Equipment
This premium piston pump barrel assembly is precision-engineered to fit the following Caterpillar earthmoving machines and forestry equipment:
- Track-Type Tractors (Dozers): Caterpillar D8R / D8R II
- Wheel Tractor-Scrapers: Caterpillar 621G / 627G / 631G / 637G
- Forestry Equipment & Feller Bunchers: Caterpillar HA871 / TK371 / TK381
Key Applications
- Hydraulic Pump Rebuilding: Serves as a vital replacement cylinder block for worn, scored, or pitted internal rotary group units.
- Pressure Restoration: Eliminates internal oil bypass, sluggish implement operation, and hydraulic system overheating caused by worn barrel bores.
- Preventative Overhaul: Essential component for field mechanics and hydraulic service facilities rebuilding primary hydraulic pumps.
Why Choose Our Aftermarket CAT Parts?
- Guaranteed OEM Quality: Manufactured under strict ISO 9001 quality standards to match original Caterpillar factory dimensions, surface finish, and hardness specs.
- Cost-Effective Solution: Achieve premium dealer-level reliability and identical hydraulic performance at a fraction of the OEM replacement price.
- Ready to Ship: Kept in stock for immediate worldwide dispatch to reduce your machine's idle downtime significantly.
- Industry-Leading Support: Backed by a full 1-year warranty and a team of professional heavy machinery hydraulic technical experts.
Frequently Asked Questions (FAQ)
Q: Is this barrel assembly a genuine Caterpillar part?
A: This is a premium-grade, OEM-compatible aftermarket replacement part. It is engineered to exact CAT dimensional tolerances and technical specifications, serving as a direct drop-in replacement for part number 183-8446 / 1838446.
Q: What is covered under the 12-month warranty?
A: Our 12-month warranty fully covers all manufacturing defects, material failures, and workmanship issues under standard operating conditions.
Q: What precautions should be taken during installation?
A: Clean and flush the main pump casing thoroughly prior to reassembly. We recommend replacing pistons, valve plates, retainer plates, and shaft seals alongside the barrel to ensure even wear and optimal performance.
Q: How long does international shipping take?
A: In-stock orders are typically dispatched within 3–5 business days. We offer expedited shipping and global air freight options for emergency machine breakdown situations.
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