Basic Info.
| Parts no. | 9r8579 | Material | Steel |
| Type | Pin | Parts Type | Engineering machinery parts |
| Compatibility | Caterpillar | Transport Package | Wooden box |
| Trademark | DIRON | Origin | Luoyang City |
| HS Code | 84099991 | Production Capacity | 5000PCS/Year |
Product Details
- Date First Listed：2025/12/06
- Manufacturer：Diron Parts
Product Description
- Part Type：Pin
- escription: Replacement Part Pin 9r8579 Suitable for Caterpillar, New
The 9R-8579 is a heavy-duty aftermarket bucket-to-stick main pivot pin engineered for medium-size Caterpillar® hydraulic excavators. Forged from high-strength 40Cr alloy steel and deep induction-hardened across all load-bearing surfaces, this pin is built to handle extreme digging forces, shock loads, and continuous articulation in demanding construction, quarrying, and demolition environments.
Key Features & Benefits
- Forged 40Cr alloy steel with case hardness > HRC 56 (depth 10–12 mm)
- Thick hard-chrome plating option available for superior wear and corrosion protection
- Precision-ground diameters to ±0.02 mm tolerance for perfect bushing fit
- Spiral grease grooves + cross-drilled lubrication channels for easy maintenance
- Exceptional shear and bending strength – proven under maximum breakout and curl forces
- Shot-blasted and finished with durable anti-corrosion coating
Common Applications (Caterpillar® Compatibility)
- Hydraulic Excavators – bucket to stick (dipper arm) main pivot: – 330B, 330BL – 330C, 330CL – 345B, 345B L (some configurations)
- One of the highest-stress pins in the front linkage of these popular 30–45 ton machines
- Frequently replaced during major linkage rebuilds and bucket conversions
Technical Specifications
- Part Number Reference: 9R-8579
- Material: Forged & heat-treated alloy steel
- Outside Diameter: 109.98 mm (4.330 in)
- Overall Length: ≈ 480–500 mm (varies slightly by model)
- Weight: ≈ 68–74 kg (150–163 lb)
- Quantity per machine: 1
Important Note:
- We only provide replacement products intended for aftermarket use in the Caterpillar machinery listed above. The brand name Caterpillar is used solely as reference information to indicate compatibility and does not imply that our products are OEM.
- Note: While this description provides general information, specific details such as size, weight and exact material may vary by manufacturer and specific application. To obtain the most accurate and up-to-date information, it is recommended to consult a qualified parts supplier such as DIRON PARTS.
FAQ
Q1. What is your terms of packing?
A: Generally, we pack our goods in neutral white boxes and brown cartons. If you have legally registered patent, we can pack the goods in your branded boxes after getting your authorization letters.
Q2. What is your terms of payment?
A: T/T 30% as deposit, and 70% before delivery. We’ll show you the photos of the products and packages before you pay the balance.
Q3. What is your terms of delivery?
A: FOB
Q4. How about your delivery time?
A: Generally, it will take 20 to 30 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.
Q5. Can you produce according to the samples?
A: Yes, we can produce by your samples or technical drawings. We can build the molds and fixtures.
Q6. What is your sample policy?
A: We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.
Q7. Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery
Q8. How do you make our business long-term and good relationship?
A:1. We keep good quality and competitive price to ensure our customers benefit ;
2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from
ABOUT DIRON
- Factory OF DIRON
Diron Parts Group Have Its Own Factory Ensure That We Offer Better Price For Customers. Besides, Diron Corporate With Some Reliable Principal Manufacturers, So Diron Also Supply Customer Other Quality Spare Parts.
- Team OF DIRON
With 18 years of manufacturing and exporting experience, Diron has a team of knowledgeable engineers, inspectors and technical workers, sales staff, after-sales personnel.
- Products OF DIRON
As a distributor, we supply parts covers for :Complete engines, Long block, Short block, Engine spare parts, Electricla products, Hydraulic products, Transmission products, Undercarridge products.Among them, Cylinder head, Cylinder block, Spacer-plate, Bushing & Pin are our best-selling products.
