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Sprocket 139-4304 for CAT 301.8 301.8C Mini Excavator | Undercarriage Replacement Parts Manufacturer

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Sprocket 139-4304 for CAT 301.8 301.8C Mini Excavator | Undercarriage Replacement Parts Manufacturer
Features Gallery Product Description Request A Quote
Features
Specifications
Dimension: OEM
Material: Steel
Abrasion Resistance: High
Condition: New
Corrosion Resistance: High
Warranty: 1500 Working Hours
Color: Black
Highlight:

CAT 301.8 mini excavator sprocket

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Mini excavator undercarriage replacement parts

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Sprocket 139-4304 for CAT 301.8C
Basic Infomation
Place of Origin: Fujian
Brand Name: Echoo
Model Number: 301.8
Payment & Shipping Terms
Delivery Time: 3-15 Working Days
Payment Terms: T/T,Western Union,Paypal
Supply Ability: 10000PCS/Month
Product Description
Sprocket 139-4304 for CAT 301.8 301.8C Mini Excavator
Undercarriage Replacement Parts Manufacturer
Product Overview
Front Idler for CAT 307C Mini Digger | Undercarriage Aftermarket Parts
Product Specifications
Item Parameter Detailed Specification
Product Name Excavator Drive Sprocket / Chain Sprocket
Compatible Model For CAT 301.8, CAT 301.8C Mini Excavator
OEM Part Number 139-4304
Material High-strength Alloy Cast Steel
Surface Treatment Deep Induction Hardening
Hardness HRC 50-55, Strong Wear Resistance
Structural Parameters 19 Teeth, 9 Bolt Holes, Inner Diameter 160mm, OEM Exact Size
Applicable Scene Construction engineering, farmland excavation, municipal road maintenance, mini excavator daily repair and replacement
Supply Capacity Direct factory manufacturer, support bulk wholesale, OEM & customized processing
MOQ 1 Piece (Sample order acceptable)
Warranty 12 Months Professional Warranty
Supporting Products Full set of CAT 301.8 undercarriage parts: Track roller, Top roller, Idler, Rubber track, Track chain assembly
Production Experience
We have over 15 years of manufacturing experience in excavator undercarriage spare parts. Our factory specializes in producing track sprockets, rollers, idlers and rubber tracks for various mini and heavy excavators including CAT, Komatsu, Kubota, JCB and more.
We control every production procedure from raw material selection, casting, CNC machining, tooth induction hardening to final quality inspection. Each sprocket is inspected dimensionally and tested for hardness before packing.
We have rich experience in aftermarket replacement parts for CAT mini excavators. We fully understand the fitment requirement of CAT 301.8 undercarriage, ensuring our sprockets match OEM specs perfectly. We serve machinery dealers, repair shops and wholesalers worldwide, and accept custom orders based on drawings or samples.
Compatible Models
301.1
301.5
301.5 REGA
301.5CR
301.6
301.6C
301.8
301.8C
302.5
302.5C
302.7D
303.5
303.5CCR
303CCR
303CR
304
304.5
304C CR
304CR
305
305C
305C CR
305CR
307
307B
307C
Expert Review
Lab measurement and site verification confirm this CAT 301.8 sprocket matches OEM dimensions. Alloy steel plus deep induction hardening achieves HRC50-55 hardness. Accurate tooth shape ensures smooth engagement with rubber tracks, lowering vibration and tooth wear. It is a reliable, cost-saving replacement for CAT 301.8 /301.8C mini excavators, suitable for municipal and farm working conditions.
Frequently Asked Questions
  • Does this front idler directly fit CAT 307C?
    Yes, it is aftermarket replacement part with OEM matching dimensions, direct installation without cutting or adjustment. It also fits CAT 307B,307D,308C.
  • What is the warranty period?
    12 months warranty under normal working condition. Damage caused by improper installation, overloading or heavy impact is not covered.
  • What's your MOQ?
    MOQ is 1 piece, mixed order with rollers, sprockets and track groups is acceptable.
  • Can you accept OEM marking and custom packaging?
    Yes, we can laser print your brand logo on idler wheel and customize packing boxes as your request.
  • How long is the lead time?
    Stock items can be shipped within 3-7 working days. Mass production orders take 15-30 days.
  • What if oil leakage occurs after installation?
    Please check installation status and track tension first. If quality problem confirmed, we will support replacement or compensation according to warranty terms.
More details please contact us at
+86 177 5075 6029 or email at service@echoo.cn
Tag:

chain drive sprocket

mini chain sprocket

track drive sprocket

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Get in touch with us
Contact Person : Mrs. Polly
Tel : 86-592-5031397
Fax : 86-592-503-1397
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ONEPARK, WUYUANWAN AVE, XIAMEN, CHINA
poly@echoo.cn
86-592-5031397
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