Product Video
Products Description
|
Brand |
Product Name |
Model |
Part Number |
|
Caterpillar |
CAT Bucket Teeth | 345 | 9W8552 |
Product Details
|
Product Name |
CAT Bucket Teeth |
|
Part Number |
9W8552 |
|
Origin |
US |
|
Brand Name |
CAT |
|
Model |
345 |
|
Price |
Negotiable |
|
Packing Details |
Standard Export Packing |
|
Delivery Time |
0-30 Days |
|
Payment Term |
L/C, T/T |
|
Price Term |
FOB, CIF, CFR |
|
Supply Capacity |
50,000 PCS/Month |
|
Minimum Order Quantity |
1 PC |
|
Material |
High Quality Steel |
|
Technology |
Precision Machining |
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Quality |
Original Factory Standard |
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After-Sales Service |
Full Support, Online Service |
|
Color |
Standard Caterpillar Color or Customizable |
|
Application |
Excavator |
|
Customizable |
including customized materials, surface treatment and specifications |
Product Features
Technical Specifications
Part Number: 9W8552
Tooth System: CAT J550
Profile Type: Standard Long Tip
Height (mm): 146
Width (mm): 128 (Cutting Edge) / 160 (Adapter Fit)
Length (mm): 341
Weight: 18.9 kg (41.7 lbs)
Material: High-Strength Cast Alloy Steel
Hardness: HB 470 - 520
Impact Toughness: ≥ 15J
High-Cycle Impact Fatigue Resistance
The 9W8552 is subjected to rigorous drop-testing to verify its resistance to high-cycle impact fatigue. Under continuous striking forces exceeding 1500 Joules, the alloy matrix resists plastic deformation. This ensures the tooth maintains its structural geometry without bending or mushrooming, even when operating in highly fractured, hard rock environments.
Volumetric Wear Threshold and Service Window
The operational lifespan of the tooth is governed by its volumetric wear threshold. The 9W8552 tip is engineered to maintain a sharp cutting profile for the first 70% of its wear cycle. This extended service window minimizes the time the hydraulic system operates under high backpressure, ensuring maximum fuel efficiency until the tooth reaches its 270 mm retirement limit.
Anti-Seize Interface and Fretting Mitigation
The J550 socket interface features a controlled surface roughness (Ra 3.2) to mitigate fretting corrosion. This specific surface finish prevents the molecular bonding that causes teeth to seize on the adapter nose during prolonged wet operations. It guarantees that the 6Y8558 pin can be extracted smoothly, drastically reducing maintenance downtime in the field.
Stress Shielding for Adapter Protection
The 9W8552 acts as a mechanical fuse for the CAT 345 bucket. Its 146 mm height and 341 mm length are optimized to absorb and dissipate the primary breakout forces before they reach the adapter root. This geometric stress shielding redirects peak loads away from the bucket lip welds, protecting the structural integrity of the entire bucket assembly from catastrophic cracking.
Stress Distribution & Wear Kinetics
Triaxial Stress Localization and Bucket Protection
The 9W8552 acts as a structural sacrifice component for the bucket lip. By absorbing the triaxial stress state during rock penetration, it localizes plastic deformation and micro-fracturing to the tooth body. This mechanism prevents fatigue crack propagation in the structural welds of the CAT 345 bucket, shifting the kinetic impact energy away from the high-value structural assembly and concentrating it on the replaceable wear part.
Breakout Force Vectors and Hydraulic Backpressure
The asymmetrical long-tip profile maintains a minimal cutting edge radius throughout its wear cycle. This geometry reduces the breakout force vector required to fracture rock. By lowering the mechanical resistance at the cutting face, it mitigates systemic backpressure in the hydraulic circuit. This prevents thermal degradation of the hydraulic fluid and avoids sustained pressure spikes that lead to pump cavitation during continuous high-load trenching.
Tribological Compatibility and Clearance Amplification
Premature failure often stems from differential wear rates between the tooth and the adapter. Bucket Tooth 9W8552 is metallurgically matched to the J550 system to ensure synchronized tribological compatibility. As the tip wears down, the internal bore maintains a precise interference fit with the adapter nose. This prevents clearance amplification, eliminating the destructive impact hammering that rapidly destroys the locking pin (6Y8558) and fatigues the adapter root.
Degradation Diagnostics & Retirement Criteria
Dimensional Limits and Volumetric Loss
Measure the functional length from the adapter nose to the tip. The original length ofBucket Tooth 9W8552 is 341 mm. When this dimension drops below 270 mm, or when the cutting edge width (originally 128 mm) expands beyond 145 mm due to blunt wear, the hydraulic backpressure increases exponentially. At this threshold, the tooth must be retired to prevent structural overload on the J550 adapter.
Retainer Elastoplastic Deformation Check
The 8E5559 retainer is subjected to continuous high-frequency vibration. Inspect the retainer for elastoplastic deformation-visible as a flattened profile or loss of spring tension. If the locking pin (6Y8558) can be rotated freely by hand inside the bore, the retainer has lost its axial locking force. Reusing a fatigued retainer will result in sudden pin shear and catastrophic tooth ejection during the dig cycle.
Adapter Interface Metal Loss Assessment
When the tooth is removed, inspect the J550 adapter nose for metal loss and scoring. If the adapter width is reduced by more than 1.5 mm compared to the original spec, or if deep grooves are visible, the adapter must be replaced. Installing a new 9W8552 on a worn adapter creates internal clearance, causing the tooth to hammer the pin bore and inducing micro-fracturing at the adapter root..
Subsurface Fatigue and Spalling Inspection
The alloy steel matrix (HRC 45-55) can develop subsurface fatigue cracks due to repetitive Hertzian contact stress. Inspect the sidewalls and the top surface for spalling (flaking of the metal layer) or hairline cracks. If any structural cracking is detected near the pin hole, immediate retirement is mandatory. A cracked tooth can shatter under load, sending high-velocity fragments into the operator's cab.
STONE
Stone is a leading supplier of engineering machinery parts, focusing on providing high-quality parts for mining companies. Since its establishment in 2004, we have been based in Shanghai, China, and have built our own brand STONE, becoming a trusted choice in the industry. We are committed to providing a variety of parts including bulldozers, excavators and wheel loaders for well-known brands such as Caterpillar and Komatsu. Our product line covers a full range of OEM parts, such as Track Chain, Track Rollers, Sprocket, Excavator Buckets, Blades, Excavator Cylinders, Swing Circles, and various electrical and hydraulic components to ensure that our customers' stringent requirements for quality and performance are met.
quality
years experience
service
hours warrant
Q＆A
How does calculating the "Cost Per Ton" justify replacing the 9W8552 before it is completely worn out?
Many operators run the tooth until it is ground down to the adapter to save on parts costs. However, a severely blunt tooth increases fuel consumption by up to 15% and slows down the digging cycle. When you calculate the cost of the extra diesel and the lost productivity (Cost Per Ton moved), the expense of a new Bucket Tooth 9W8552 is recovered within days. Early replacement based on the 270 mm length threshold is far more economical.
How does an unbalanced 9W8552 tip accelerate the fatigue of the bucket linkage pins?
A dull tooth requires a longer contact time with the rock to fracture it. During this extended period, the hydraulic system operates at peak pressure, transmitting continuous low-frequency vibration through the boom and stick into the cab. This persistent vibration is a major contributor to operator fatigue during 8-hour shifts. Maintaining a sharp cutting edge (HB 470-520) minimizes vibration transfer and improves operator comfort.
What is the relationship between a dull 9W8552 and increased operator fatigue in the cab?
With the 6Y8558 pin and 8E5559 retainer fully seated, the maximum allowable lateral play between the tooth socket and the adapter nose is 0.5 mm. This clearance is measured using a feeler gauge at the side interface. If the play exceeds 0.5 mm on a brand-new tooth, it indicates an out-of-spec aftermarket casting or a worn adapter nose. Operating with excessive lateral play creates repetitive impact loading, leading to premature pin shear.
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