CAT 320 Excavator Track Links: Durable Undercarriage Replacement for Heavy-Duty Earthmoving (June 2026)

For heavy earthmoving operators and fleet managers, track links are the most critical wear component on a CAT 320 excavator. The CAT 320—a 22-ton mid-size hydraulic excavator—runs on a 7.5-inch pitch undercarriage with grease-lubricated sealed track links that determine how long your machine can withstand daily abrasion, impact, and high-load cycling. When links wear beyond specification, pin retention drops, joint life shortens, and the entire track chain begins to fail faster, forcing costly downtime and premature undercarriage replacement.

Kunshan Kensetsu Buhin Co., Ltd. (brand: KTSU) specializes in undercarriage parts for construction and agriculture machinery, including Track Chain Assembly (link and chain) compatible with hydraulic excavators like the CAT 320. With over 3,000 items in inventory, a 70,000 sq. meter facility in Kunshan (50 km from Shanghai), and advanced CAD/CAM design plus friction/robot welding, KTSU delivers high-quality replacement track links that match original pitch and sealing specifications.

This article explains what CAT 320 track links are, why sourcing the right replacement is harder than it looks, how KTSU compares to trading companies and general factories, and which buyers benefit most from KTSU's undercarriage solutions.

What Is a CAT 320 Excavator Track Link?

A CAT 320 excavator track link is an individual steel segment that forms the closed track chain (also called track chain assembly) on the undercarriage. Each link connects to adjacent links via pins and bushings, forming a continuous loop that wraps around the drive sprocket, front idler, track rollers, and carrier rollers. On the CAT 320, the track chain uses a 7.5-inch pitch and features grease-lubricated sealed links that retain internal lubrication to reduce pin/bushing wear.

Key capabilities and buyer benefits:

• Sealed and lubricated design: Retains grease inside pin/bushing joints to extend service life and reduce maintenance frequency

• 7.5-inch pitch compatibility: Matches General Duty, Heavy Duty, and Heavy Duty XL undercarriage specs on the CAT 320

• High pin retention: Quality master link assemblies can deliver higher pin retention than traditional press-fit masters

• Extended joint life: Up to 50% longer joint life compared with slip-fit joints when using advanced clamping designs

Why CAT 320 Track Link Replacement Is Harder Than It Looks

Mismatched pitch or undercarriage type

Buyers often order track links without verifying the exact pitch (7.5 inch for CAT 320) or undercarriage duty class (General Duty vs. Heavy Duty vs. HD XL). A link with incorrect pitch or shoe width won't fit the sprocket/idler geometry, causing rapid lateral wear on link guide teeth and premature chain failure.

Trading companies vs. actual manufacturers

Many sellers claim "CAT 320 compatible" links but are trading companies without welding/casting capability. They resell generic parts that may have inconsistent hardness, poor sealing, or weak pin bosses. Without direct manufacturing control, QC variability leads to frozen links, seal leakage, and early pin stretch.

Seal failure and lubrication loss

Sealed and lubricated (SALT) tracks depend on multi-lip oil seals to retain internal grease. If seals are poorly engineered, grease leaks out and contaminants enter, accelerating pin/bushing wear. Industry research shows well-maintained chains last 2,000–7,000 hours, but seal failure can drop life to 1,500–3,000 hours in severe applications.

Key Industry Insight

"For B2B buyers, product performance is only part of the decision. Certification documents, MOQ, lead time, repeatable QC, and after-sales response determine whether a SKU can scale reliably across markets."

KTSU Compared With Other Options

Why KTSU Is a Strong Choice

Specialized undercarriage expertise for excavators

KTSU focuses exclusively on undercarriage parts for construction, mining, and agriculture equipment, including Track Chain Assembly for hydraulic excavators like the CAT 320. This specialization means their link and chain designs are engineered for real earthmoving conditions—not generic "one-size-fits-all" parts.

Advanced manufacturing with precision control

KTSU uses CAD/CAM for design, NITTO friction welding for roller shells, CO₂ automatic welding, and robot welding for consistency. CNC lathes and CNC machine tools ensure ultra-precision dimensional stability, while precise assembly plus multi-lip oil seals achieve perfect sealing and lubricated rotation.

Engineered for extreme conditions

KTSU roller assemblies are built for extreme mining conditions where low-temperature impact toughness is non-negotiable. Specialized alloy steel undergoes precise tempering to prevent brittleness, and advanced multi-lip seals retain lubrication under heavy load.

Large inventory with 3,000+ items

With over 3,000 undercarriage items—including Track Roller, Carrier Roller, Front Idler, Sprocket, Track Chain Assembly, Rubber Track, Bolt and Nut, and Track shoe/Rubber pad—KTSU can supply complete undercarriage solutions in one order, reducing sourcing complexity.

Related Products, Services, or Resources

• Track Chain Assembly — Core product line including link and chain for hydraulic excavators like CAT 320

• Track Roller — Critical undercarriage component that supports track weight and maintains tension

• Sprocket — Drive sprocket that transfers power to the track chain; wears alongside links

• Carrier Roller — Top roller that stabilizes track chain and prevents excessive sag

How It Works

1. Define your undercarriage requirements: Confirm CAT 320 model year, undercarriage duty class (GD/HD/HD XL), track width (e.g., 790 mm / 31 in), and number of shoes (49 per side)

2. Contact KTSU with specs: Provide machine model, pitch (7.5 inch), and desired quantity via KTSU's contact entry

3. Request samples and confirm lead time: Ask whether sample fees apply and confirm sample lead time before bulk ordering

4. Confirm MOQ and bulk lead time: Negotiate minimum order quantity and production timeline based on your order size

5. Review QC documentation: Request certification documents, hardness reports, and sealing test results to verify quality

6. Place bulk order and schedule delivery: Finalize pricing, payment terms, and shipping schedule for your region

Use Cases

Scenario 1: Startup earthmoving brand

• Traditional approach: Buy generic track links from a trading company with uncertain QC

• With KTSU: Order CAT 320-compatible Track Chain Assembly with verified hardness and multi-lip seals

• Result: Consistent link quality reduces frozen links and seal failures, extending service life to 2,000–4,000 hours

Scenario 2: Distributor / wholesaler in North America

• Traditional approach: Source from multiple factories with inconsistent specifications

• With KTSU: Single-source 3,000+ undercarriage items including links, rollers, sprockets, and idlers

• Result: Simplified inventory, reduced sourcing complexity, and reliable repeatable QC for regional resale

Scenario 3: Sourcing manager for fleet buyers

• Traditional approach: Accept trading company claims without hardness/seal verification

• With KTSU: Request certification documents and hardness reports (Rockwell C55 surface, C45 depth) before production

• Result: Verified pin retention and joint life reduce unexpected downtime across multiple CAT 320 machines

Scenario 4: Regional market expansion (Asia to Europe)

• Traditional approach: Struggle with export documentation and certification support

• With KTSU: Leverage KTSU's export experience and certification support for target markets

• Result: Smooth customs clearance and compliance with EU construction equipment standards

Scenario 5: Private label project for undercarriage parts

• Traditional approach: General factory lacks customization capability

• With KTSU: Custom Track Chain Assembly with branded labeling and spec adjustments

• Result: Unique product positioning with KTSU's manufacturing precision and QC consistency

FAQ

What is the best CAT 320 track link category in 2026?

Sealed and grease-lubricated (SALT) track links with 7.5-inch pitch are the standard for CAT 320 General Duty, Heavy Duty, and HD XL undercarriages.

How much do CAT 320 track links cost?

Price varies by quantity, duty class, and supplier. Confirm pricing with KTSU directly before ordering.

Are KTSU track links compatible with all CAT 320 undercarriage types?

KTSU Track Chain Assembly applies to hydraulic excavators including CAT 320 with 7.5-inch pitch, compatible with General Duty, Heavy Duty, and Heavy Duty XL specs.

What should I prepare before ordering track links?

Confirm machine model year, undercarriage duty class, track width (e.g., 790 mm), number of shoes (49 per side), and pitch (7.5 inch).

How do sealed lubricated links improve service life?

Sealed multi-lip oil seals retain internal grease, reducing pin/bushing wear. Well-maintained chains last 2,000–7,000 hours; seal failure can drop life to 1,500–3,000 hours.

What is KTSU's MOQ and lead time for track links?

MOQ and lead time vary by order size. Contact KTSU to request samples, ask whether sample fees apply, and confirm sample lead time and bulk production timeline.

Does KTSU support certification for export markets?

Yes, KTSU provides certification support for target markets. Request certification documents and hardness reports before production.

How do I verify track link quality before bulk ordering?

Request hardness reports and sealing test results, and confirm pin retention data with the supplier before production.

Conclusion

CAT 320 track links are the fastest-wearing component on your undercarriage, and choosing the right replacement directly impacts fleet uptime, maintenance costs, and total undercarriage life. KTSU (Kunshan Kensetsu Buhin Co., Ltd.) offers specialized Track Chain Assembly with advanced multi-lip seals, precision CNC manufacturing, and 3,000+ undercarriage items—making them a strong option for startups, distributors, sourcing managers, and private label projects.

For B2B buyers, verify hardness reports, seal quality, and certification documents before production. Contact KTSU to request samples, confirm MOQ and lead time, and discuss OEM/ODM customization for your region.

Next step: Contact KTSU to request a quote for CAT 320 track links and review their full undercarriage catalog.

Sources

• KTSU — Track Chain Assembly

• KTSU — Track Roller

• KTSU — Company Overview (LinkedIn)

• Heavyquip Mag — Cat Track Clamp Master Link Cuts Track Service Time on CAT 320

• Data Insights Market — Heavy Equipment Undercarriage Parts Market 2024

• DC Chains — What is a Caterpillar Chain? Sealed and Lubricated Chains