Heavy-Duty Tension Spring Assembly for Kobelco SK230 Excavator
The SK230 track adjuster (tension spring assembly) maintains ideal track tension, reducing wear and preventing derailment. Engineered for durability, this unit includes a robust recoil spring, cylinder, and yoke—perfectly suited for the Kobelco SK230 and similar machines.
| Piston Rod | 40Cr / 42CrMo (Hard Chrome Plated) |
|---|---|
| Cylinder Body | Q345 / 45# Steel / 40Cr |
| Return Spring | 60Si2Mn / 65Mn Spring Steel |
| Cylinder Head / End Cap | 45# Steel / Cast Steel |
| Grease Nipple & Fittings | Carbon Steel (Zinc Plated) / Stainless Steel |
| Colors | Black or yellow or customized |
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Kinton Parts is trusted by professionals worldwide for delivering high-quality parts for excavators, bulldozers, and other construction machinery—with guaranteed performance and durability.
The tension spring assembly (commonly called the tensioner or recoil spring assembly) plays a vital role in keeping the excavator’s undercarriage stable. It maintains proper track tension by compensating for slack as the machine operates.
Without this component, the track would become loose, leading to excessive wear or even derailment during digging, turning, or climbing.
For the SK230 excavator, this tensioner ensures:
- Smooth track movement
- Reduced shock load on the frame
- Extended service life for sprockets, rollers, and chains
- Stability across various terrains, from mud to gravel
Structure Diagram & Cross-Sectional Sketch Descriptions
Assembly Structure Diagram
This image shows the complete tension spring assembly, including:
- Recoil Spring – Coiled high-tension steel with precision winding to absorb movement
- Cylinder Housing – Heavy-duty forged steel body for housing and guiding the spring
- Front Yoke/Bracket – Connects to the idler wheel and transfers spring force
- Grease Chamber – Allows easy adjustment via grease gun
The diagram below shows how the components connect to form a compact and efficient tensioning system.
Cross-Sectional Sketch
The cross-section reveals the internal layout of the spring, plunger, and grease chamber.
You can clearly see:
- The sealed grease channel that builds pressure against the plunger
- The internal buffer zone, designed to cushion impact from external forces
- Grease seals and bushings for leak-free operation
This view helps users understand why our SK230 tensioner delivers stable, low-maintenance performance even under extreme stress.
Manufacturing and Material Details
Our SK230 tension assemblies are built to handle heavy excavation with minimal downtime. Key materials and processes include:
- High-Tensile Spring Steel – The recoil spring is made from 60Si2Mn or equivalent, treated for superior elasticity and fatigue resistance.
- Forged Cylinder & Yoke – Heat-treated alloy steel for high compressive strength and crack resistance.
- Surface Hardening – Contact surfaces are quenched (HRC 50-55) for wear resistance.
- Sealing & Greasing – Nitrile or Viton seals prevent grease leakage, and integrated grease fittings allow easy field tension adjustment.
OEM Undercarriage Parts for Kobelco Excavator
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| KOBELCO | SK30 | SK35 | SK40 | SK45 | SK55 | SK60 | SK60-8 | SK60-10 |
| SK75 | SK100 | SK120 | SK120-5 | SK120-6 | SK130 | SK135 | SK135SR | |
| SK135SR-2 | SK140 | SK140SR | SK200 | SK200-3 | SK200-5 | SK200-6 | SK200-8 | |
| SK200-10 | SK210 | SK210-8 | SK210LC | SK220 | SK230 | SK230LC | SK250 | |
| SK250-8 | SK260 | SK260LC | SK270 | SK300 | SK300-6 | SK300-8 | SK320 | |
| SK330 | SK330-6 | SK350 | SK350-8 | SK350LC | SK380 | SK400 | SK450 | |
| SK480 | SK480-8 | SK485 | SK500 | SK500LC | SK850 | SK850LC | ||
Looking for a specific make or model not listed here? Reach out and we’ll be happy to assist.
Compatible Models & Part Numbers
This adjuster is specifically designed for:
- Kobelco SK230-6 / SK230-8 / SK230LC
May also fit SK210, SK250, or other variants with matching idler configurations
Common part numbers (please confirm with your undercarriage specs):
- YN40F00031F1
- YN40F00033F1
- LC40F00038F1
If you’re unsure about compatibility, feel free to send us your machine’s serial number or drawing—we’ll help you confirm fitment.
Why Choose Our SK230 Tension Spring Assembly?
- Exact OEM Dimensions – Direct replacement without modification
- High Recoil Strength – Maintains tension during vibration, slope travel, or high load
- Grease-Adjustable Design – Quick field adjustment with a grease gun
- Enhanced Corrosion Protection – Anti-rust paint or zinc coating applied
- Photo & Video Confirmation – We provide inspection visuals before shipment
- OEM/ODM Options – Custom logo or packaging services available
Pre-Shipment Support
Before delivery, we provide:
- Photos & videos of the actual product
- Packing confirmation
- Inspection checklist
This helps ensure you know exactly what you’re receiving—no surprises, no delays.
SHIPPING & DELIVERY
At Kinton Parts, we ensure reliable, worldwide shipping of parts for excavators, bulldozers, and a full range of construction machines—safe, fast, and secure.
All products are securely packed using high-quality export cartons, reinforced wooden cases, or industry-standard palletized packaging to ensure maximum protection during transit and smooth handling during unloading.
Standard orders are typically shipped within 3–5 working days, while large or customized orders are usually dispatched within 7–20 days, depending on volume and production requirements.
We offer flexible global shipping options, including:
- International sea freight for cost-effective bulk transport
- Air freight for urgent orders
- Courier delivery (DHL, FedEx, UPS) for small-volume or sample shipments
Our logistics team manages every shipment carefully, providing real-time updates and tracking information until your order arrives safely at your destination.
Need assistance choosing the best shipping method for your location and timeline? Contact our team — we’ll help you plan a smooth delivery experience.
FAQ
Q: What are your main products?
A: We supply a full range of undercarriage and wear parts for excavators, bulldozers, and other heavy equipment. Our product line includes: Track rollers, carrier rollers, front idlers, sprockets, segments, track shoes, track chains, bolt and nuts, pins and bushings, bucket teeth and adaptors, filters, seal kits, swing bearing, and hydraulic cylinder—plus other essential replacement parts.
Q: Which countries do you export to?
A: Kinton Parts exports to over 60 countries worldwide, including:
USA, Canada, UK, Germany, Russia, UAE, Indonesia, Malaysia, Thailand, India, Pakistan, Bangladesh, Sri Lanka, South Africa, Colombia, Peru, and many others.
Q: Can I order a sample?
A: Yes, we accept trial orders. For parts in stock, samples can be shipped quickly. If you have technical drawings or existing samples, we also support customized production and mold development.
Q: How can I track my order after shipping?
A: Once your order is shipped, we will provide you with all necessary tracking information based on the shipping method. For express deliveries, you’ll receive a tracking number to follow the shipment online. For air or sea freight, we’ll send you the relevant documents such as the airway bill (AWB) or bill of lading (B/L), along with the packing list and commercial invoice to help with tracking and customs clearance.
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Trusted by professionals worldwide, Kinton Parts supplies premium-quality components for excavators, bulldozers, and more—with reliable quality you can count on.
