D4H D5H Compact Bulldozer Track Chain Link 35MnBH Steel HRC 40-55 Hardness 190mm Pitch Forged Dry Link

The D4H-D5H-DRY-TL Track Chain Link is a premium undercarriage component manufactured by YT (YinTai Parts), engineered for demanding excavator and bulldozer applications across construction, mining, and earthmoving projects. With over 35 years of manufacturing expertise based in Quanzhou, Fujian, China, our factory produces track chain links that meet stringent OEM specifications for major equipment brands worldwide.

Each track chain link is forged from 35MnBH high-grade alloy steel and undergoes a rigorous heat treatment process to achieve surface hardness levels of HRC 40-55 with a hardened depth of 4-10 mm. This advanced metallurgical treatment ensures exceptional wear resistance, extended service life, and reliable performance even in abrasive working conditions commonly encountered in mining, quarrying, heavy construction, and forestry operations.

• 190mm Compact Pitch Optimization: The 190mm link pitch is optimized for D4H and D5H class compact bulldozers, providing the ideal balance of structural strength and track flexibility needed for precise grading, backfilling, and light dozing applications on smaller construction and landscaping projects.
• Cost-Effective Dry-Type Design: The dry-type link design eliminates the complexity and cost of sealed lubrication systems, making these chains an economical choice for compact bulldozers that operate at lower travel speeds and in less abrasive conditions compared to heavy production machines.
• Precision Forged Link Geometry: Each link is hot-forged in closed dies to ensure consistent dimensional accuracy and uniform material density, providing reliable sprocket engagement and smooth track rotation essential for the precise machine control required in grading and finishing work.
• Induction Hardened Rail Contact Surfaces: Selective induction hardening of the link rail running surfaces provides localized wear resistance where track rollers make contact, maintaining consistent track guidance without the cost and complexity of through-hardening the entire link body.
• Maintenance-Friendly Design Features: Standard master pin connections and accessible grease fittings on all joints facilitate routine maintenance and individual link replacement, reducing service time and labor costs for equipment owners performing their own undercarriage upkeep.
• Versatile Application Compatibility: Suitable for a wide range of compact track-type tractor applications including agricultural land preparation, vineyard and orchard management, residential construction, landscaping, snow removal, and light forestry work.

At YT(YinTai Parts), our manufacturing process begins with the careful selection of 35MnBH steel raw material sourced from certified Chinese steel mills. The steel billets are heated to precise forging temperatures of 1100-1200 degrees Celsius in computer-controlled induction furnaces before being shaped under 2500-ton forging presses. Each link blank undergoes precision machining on CNC milling centers to achieve exact dimensional tolerances within ±0.1mm accuracy. The critical heat treatment stage involves austenitizing at 850-880 degrees Celsius followed by controlled oil quenching and tempering to achieve the specified HRC 40-55 surface hardness with 4-10mm hardened case depth. After heat treatment, every link passes through shot blasting for surface cleaning and stress relief. Final quality inspection includes magnetic particle testing for surface defects, ultrasonic testing for internal integrity, and coordinate measuring machine verification of all critical dimensions against OEM specifications.

YT (YinTai Parts) has been a trusted manufacturer of construction machinery undercarriage components since 1988, accumulating over 35 years of industry experience from our production base in Quanzhou, Fujian Province. Our 50,000-square-meter manufacturing facility is equipped with advanced forging lines, CNC machining centers, automated heat treatment furnaces, and comprehensive material testing laboratories. We hold ISO 9001:2008 quality management certification and CE certification for our exported products, ensuring compliance with international quality and safety standards. Our dedicated R&D team of 25 engineers continuously works on material improvements and design optimization to extend product service life. With an annual production capacity exceeding 120,000 track chain link assemblies, we serve distributors, equipment dealers, and end users in over 60 countries across Southeast Asia, the Middle East, Africa, South America, and Europe. Our in-house logistics team manages container loading, customs documentation, and international shipping coordination to ensure timely delivery worldwide.

This compact bulldozer track chain assembly with 190mm pitch dry links is engineered for Caterpillar D4H and D5H series compact track-type tractors commonly used in small to medium-scale earthmoving, residential and commercial site preparation, agricultural land management, road maintenance, landscaping, and light forestry operations. The dry-type design provides a practical and economical undercarriage solution for machine owners who perform their own routine maintenance and prefer straightforward field-serviceable components. Agricultural contractors using D4H and D5H tractors for land clearing, terracing, and drainage work benefit from the competitive pricing and reliable performance of these aftermarket track chains, while construction companies with smaller dozer fleets appreciate the reduced capital investment in undercarriage replacement without sacrificing operational reliability.

Q: What is the difference between dry links and sealed lubricated links for compact bulldozers?

Dry links have open pin and bushing joints that require periodic external greasing and eventually need pin and bushing turning to compensate for internal wear. Sealed lubricated (SALT) links have factory-sealed lubricant reservoirs that eliminate the need for routine pin turning. Dry links offer lower initial cost and simpler field maintenance, making them well-suited for compact bulldozers with lower annual operating hours and less abrasive working environments.

Q: How often should dry chain pins and bushings be greased?

We recommend greasing dry chain pins and bushings every 8-10 operating hours or daily for machines in continuous use. Use a lithium-based extreme pressure grease and apply until fresh grease appears at the joint edges. Proper and consistent greasing is the single most important factor in maximizing the service life of dry-type track chains.

Q: Are these chains compatible with LGP (Low Ground Pressure) versions of D4H and D5H?

Yes, these track chain links are compatible with both standard and LGP (Low Ground Pressure) configurations of the D4H and D5H. The link dimensions remain the same; the LGP configuration uses wider track shoes mounted on the same link bolt pattern to achieve reduced ground pressure for soft terrain operation.

Q: Can I convert my D4H from dry chains to SALT chains?

Conversion from dry to SALT chains is possible as the link dimensions and sprocket interface are compatible. However, it is generally more economical to stay with dry chains for D4H/D5H class machines given their lower operating speeds and typical duty cycles. SALT chains provide the greatest benefit on larger machines with higher travel speeds and more abrasive operating conditions.

Q: What is the expected service life for these dry chain assemblies?

With proper daily greasing and regular track tension adjustment, these dry chain assemblies typically provide 1,500 to 3,000 operating hours in general construction and agricultural applications. Pin and bushing turning at approximately 50 percent wear can extend total service life by allowing use of the unworn side of the pins and bushings before complete replacement is required.

All track chain link assemblies are packaged in export-grade wooden pallets or steel crates with protective anti-rust coating applied to all machined surfaces before shipment. Each pallet is clearly labeled with product model, quantity, batch number, and manufacturing date for easy identification and inventory management. We offer comprehensive warranty coverage of 18-24 months from the date of shipment against manufacturing defects and premature wear under normal operating conditions. In the unlikely event of a warranty claim, our technical support team provides prompt response within 24 hours and arranges replacement parts shipment within 7 working days. Custom packaging options including branded packaging, retail-ready box packaging, and OEM neutral packaging are available upon request to meet specific distribution channel requirements.