Product Video
Products Description
|
Brand |
Product Name |
Model |
Part Number |
|
Caterpillar |
Bucket Long Tip | 374 | 4T-4702 |
Product Details
|
Product Name |
Bucket Long Tip |
|
Part Number |
4T-4702 |
|
Origin |
US |
|
Brand Name |
CAT |
|
Model |
374 |
|
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 |
|
Quality |
Original Factory Standard |
|
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
Height (mm): 196
Width (mm): 180
Length (mm): 480
Weight: 36.3 kg (80 lbs)
Material: Alloy Steel (Cast)
Hardness: 45-55 HRC
Tooth System: CAT J700a
Asymmetrical Self-Sharpening Profile
Unlike blunt-ended standard teeth, the 4T4702 features an asymmetrical wear face. As the material wears down during rock excavation, it exposes a narrower cutting edge rather than a flat surface. This self-sharpening geometry continuously reduces the contact area, preventing the exponential increase in breakout force typically required as a standard tooth dulls.
Directional Solidification and Grain Refinement
The casting process utilizes directional solidification, controlling the cooling rate from the base to the tip. This refines the grain boundary structure, avoiding the coarse crystalline structures that cause brittle fracture. The refined microstructure provides uniform load distribution across the entire 196 mm tooth height, resisting micro-cracking under high-frequency impact.
Sub-Zero Quenching for Fatigue Resistance
After standard heat treatment to 45-55 HRC, the 4T4702 undergoes a sub-zero quenching process. This step forces the transformation of retained austenite into martensite, relieving internal thermal stresses. It stabilizes the tooth's dimensions and dramatically improves resistance to metal fatigue, preventing the sidewalls from spalling under repetitive prying loads.
Anti-Seize Recessed Pin Bore Geometry
The J700 adapter interface features a recessed pin bore geometry designed specifically for challenging maintenance environments. This prevents abrasive mud and fine debris from packing around the 4T4708 pin head. Even after prolonged exposure to wet overburden, the locking pin can be easily driven out without specialized extraction tools.
Operational Synergy
Micro-Cutting Mechanics and Self-Sharpening Kinetics
During the excavation of abrasive rock, the wear process at the tooth tip is governed by micro-cutting rather than simple macro-abrasion. The 4T4702 is engineered so that as the alloy matrix wears, it continuously sheds blunt micro-edges, exposing new, sharper crystalline boundaries. This kinetic self-sharpening effect maintains a lower penetration resistance, preventing the hydraulic breakout force from rising exponentially as the tooth ages.
Stress Wave Dispersion at the Adapter Interface
When the 4T4702 impacts hard granite, the kinetic energy is converted into high-frequency stress waves. A poorly fitted tooth causes these waves to reflect sharply at the adapter interface, leading to spalling. The precision-machined J700 socket allows for optimal acoustic impedance matching between the tooth and adapter, dispersing the Hertzian contact stress over a wider volume and mitigating fatigue crack initiation at the adapter root.
Thermal Softening Threshold and Frictional Heat Dissipation
In high-speed trenching or heavy rock ripping, the friction at the cutting edge generates localized temperatures exceeding 400°C. Standard teeth experience a drop in hardness (thermal softening), accelerating wear. The 4T4702 undergoes a specialized tempering process that raises its thermal softening threshold. It maintains its structural integrity and HRC 45-55 hardness even under sustained high-temperature friction, ensuring the cutting geometry remains stable.
Installation
Adapter Interface Stress Distribution
Mounting a high-hardness 4T4702 tooth on a compromised J700 adapter alters the contact stress distribution. If the adapter nose has localized wear (exceeding 1.5 mm), the load previously borne by the entire face concentrates on the unworn high spots. This triaxial stress concentration leads to micro-fractures at the adapter root under high breakout forces.
Lapping Paste Prevention via Dry Fit
Applying standard chassis grease to the tooth socket acts as a binder for silica dust. During operation, this mixture forms an aggressive lapping paste that machines away the adapter nose. A dry fit or a high-temp dry-film anti-seize is required to ensure metal-to-metal interference fit without abrasive entrapment.
Retainer Ejection Threshold and Shear Load
The 4T4708 pin relies on a mechanical stop provided by the 4T4707 retainer. During high-impact digging, elastoplastic deformation of the retainer groove can reduce its holding force. The installation protocol requires verifying that the retainer sits fully bottomed in the groove; a partial seat reduces the ejection threshold and risks sudden pin shear.
Zero-Clearance Fitment and Load Transfer
A verification of tactile lateral play is critical. Any visible clearance exceeding 0.5 mm at the nose interface indicates a mismatch in the interference fit. This gap prevents proper load transfer from the tooth to the adapter, converting the digging force into a reciprocating impact load that rapidly destroys the pin bore and bucket lip.
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 the 4T4702 long profile physically affect the hydraulic backpressure of the CAT 374?
The RXL long tip acts as an extended lever arm. When penetrating hard rock, the increased length creates a higher bending moment at the adapter nose compared to a standard tooth. This concentrated stress translates to a higher breakout force requirement. The hydraulic system compensates by increasing pressure. If the tooth becomes blunt, this backpressure can exceed the system's continuous operating rating, leading to thermal overload and premature pump wear.
What causes thermal interference at the J700 adapter interface during continuous operation?
During continuous heavy digging, the 4T4702 tooth body absorbs frictional heat, expanding radially. Because the J700 adapter nose has a different mass and thermal dissipation rate, the clearance between the tooth socket and the adapter can shrink. If the interference becomes too tight under high temperatures, it can cause galling (seizure) between the mating surfaces, making the tooth extremely difficult to remove even after the pin is extracted.
How does fretting wear dictate the replacement of the 4T4708 locking pin?
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