Product Video
Products Description
|
Brand |
Product Name |
Model |
Part Number |
|
Hitachi |
Track Chain | EX1200 | 9276370 |
Product Details
|
Product Name |
Track Chain |
|
Part Number |
9276370 |
|
Origin |
Japan |
|
Brand Name |
STONE |
|
Model |
EX1200 |
|
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 |
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Minimum Order Quantity |
1 PC |
|
Material |
High Quality Steel |
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Technology |
Precision Machining |
|
Surface |
Treatment Anti-Corrosion Coating |
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Hardness |
HRC 48-52 |
|
Quality |
Original Factory Standard |
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After-Sales Service |
Full Support, Online Service |
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Color |
Customizable |
|
Application |
Excavator |
|
Customizable |
including customized materials, surface treatment and specifications
|
Product advantages
Hitachi EX1200
Specifications:
Engine Model: Cummins QSK23-C
Net Flywheel Power: 567 kW (760 HP)
Operating Weight: 117,000 kg
Track:
Number of Carrier Rollers - Each Side: 3
Number of Track Rollers - Each Side - Long Undercarriage: 8
Multi-Lip Sealing & Joint Protection
The sealing system directly determines how long the pin and bushing remain in service. When seals fail, contaminants enter the joint and mix with the grease, forming an abrasive slurry that accelerates wear. The multi-lip seal ring prevents this by maintaining a barrier against water, dust, and fine particles - keeping the lubricant clean and the bearing surfaces intact.
Pitch Control & Power Transmission Stability
The 9276370 Track Chain is manufactured with pitch tolerances that account for thermal expansion and contraction during operation. When all links share the same pitch, tooth engagement is consistent across the entire sprocket circumference. This prevents the chain from "hunting" for position during rotation, reducing noise and vibration and minimizing impact stress at the contact point.
Pin & Bushing Matching for Hard Rock
The hardness relationship between pin and bushing determines the chain's ability to resist both impact and abrasion. Too much hardness leads to brittleness and fracture; too little accelerates wear. The solution for hard rock conditions is a hardness gradient - the pin surface is hardened to resist abrasion while the core retains toughness for impact absorption. The bushing runs slightly softer, acting as a sacrificial layer that protects the more expensive pin component.
Dimensional Consistency & Direct Replacement
The installation dimensions of a replacement chain determine how easily it can be fitted in the field. When dimensions match, the new chain drops into the existing undercarriage system without grinding or adjustment - reducing installation time and field effort. Even small dimensional deviations increase installation resistance or alter running clearance, affecting initial run-in and long-term life. Manufacturing to original dimensions is the foundation of field compatibility.
Work efficiency
Travel Response & Cycle Time
Pitch elongation is the primary manifestation of chain wear, driven by material loss at the pin and bushing interface. Hardening treatment forms a dense wear-resistant layer on the pin surface, reducing material loss per operating hour. This significantly slows down pitch elongation and delays the point at which the chain reaches its replacement limit.
Unplanned Downtime & Cost Efficiency
Cost per ton is made up of three components: chain price, replacement frequency, and downtime losses. The 9276370 Track Chain reduces all three simultaneously - fewer chains purchased, less labor for replacements, and shorter downtime. The overall cost per ton decreases as a result.
Extended Overhaul Intervals
Travel cycle time is influenced by rolling resistance, which in turn depends on friction between pins and bushings. The 9276370 Track Chain maintains consistent friction control, reducing power loss during travel. This keeps travel time stable between loading and dumping points - predictable performance means the shift rhythm stays consistent, regardless of undercarriage condition.
Daily Maintenance Recommendations
Pre-Shift Tension Check
Track tension directly affects the wear rate of pins and bushings. Too loose causes the chain to slap against the sprocket, accelerating tooth wear and increasing the risk of derailment. Too tight adds unnecessary load on pins and bushings, speeding up elongation. The correct sag setting balances both extremes, allowing the chain to run at its designed service life.
Pitch Elongation Measurement
For the 9276370 Track Chain, the most reliable wear indicator is pitch elongation measured across a 10-link section. A 4% elongation from the original pitch indicates the chain has reached its replacement threshold. Waiting beyond this point risks sprocket damage and sudden chain failure. Regular measurement every 250 hours allows timely replacement planning without unscheduled stops.
Link Area Cleaning
Packed material in link joints restricts pin rotation and accelerates localized wear. When pins cannot rotate freely, the same contact surface remains engaged continuously, causing uneven wear and premature elongation. Daily removal of packed debris from link joints and shoe surfaces maintains proper pin rotation and extends chain life.
Operational Noise Monitoring
Track noise during travel provides early warning of developing problems. Clicking indicates pin rotation is restricted - often due to debris or insufficient lubrication. Grinding suggests abrasive material is lodged between moving surfaces. Knocking points to excessive clearance in the joint, indicating advanced wear. Addressing these sounds at the first sign prevents a minor issue from escalating into a chain breakage that stops production.
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
When does the EX1200 track chain need to be replaced?
The primary indicator for track chain replacement is pitch elongation measured at the pin and bushing interface. Using a pitch gauge across a 5-link section, compare the current measurement against the original pitch specification. Replacement is due when elongation reaches 3-5% of the original dimension. Link cracks, pin protrusion, or visible joint gaps are also signs that the chain has reached its service limit. Regular checks at 250-hour intervals prevent unplanned downtime.
Why is track tension adjustment important after chain installation?
What happens if the track chain is used beyond its wear limit?
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