Dingtai manufactures Kobelco track cylinder pistons, precision components that transfer hydraulic grease pressure to maintain correct track tension in excavator undercarriages.
We operate as a factory-direct China manufacturer, providing complete OEM and aftermarket supply programs for global distributors and equipment fleets.
Our pistons resist scoring, pressure loss, and premature seal failure, reducing unplanned downtime and extending track adjuster service life in demanding conditions.
With over 20 years of undercarriage component expertise, Dingtai holds ISO9001 and SGS certifications, ensuring consistent metallurgy and dimensional accuracy.
Each piston uses 40Cr alloy steel, CNC precision machining, and induction hardening to deliver reliable hardness, surface finish, and long-term wear resistance.
Core Selling Points
- 20+ Years Experience: Two decades of heavy machinery component manufacturing ensure proven engineering, stable quality, and deep knowledge of Kobelco undercarriage systems.
- Global Brand Compatibility: Our pistons match OEM part numbers for Kobelco SK-series excavators, enabling direct replacement without modification or field fitting.
- Deep Quenching/Heat Treatment: Controlled heat treatment produces a hard wear surface and tough core, reducing deformation and fatigue cracking under high track tension loads.
- 100% QC Inspection: Every batch undergoes dimensional inspection, hardness testing, and surface finish checks before shipment, ensuring zero-defect parts for critical applications.
Our catalog of Kobelco Track Cylinder Piston includes various specifications, fully compatible with Kobelco excavators and bulldozers.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 40Cr alloy steel / 45# carbon steel |
| Hardness | HRC 28–32 after quench and temper |
| Surface Treatment | Hard chrome plated sealing surface |
| Process | CNC turning, precision grinding, induction hardening |
| Certification | ISO9001:2015, SGS |
| Warranty | 12 months or 2,000 operating hours |
2. OEM & Customization
We manufacture from customer drawings or samples, matching Kobelco OEM dimensions, tolerances, and surface finishes for direct replacement.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Excavator | Kobelco | SK200-8, SK210LC-8, SK230-6E, SK250-8, SK260-8 |
| Excavator | Kobelco | SK330-8, SK350LC-8, SK380, SK450-8 |
4. Delivery & Logistics
Factory-direct pricing, flexible MOQ, and export-grade packing ensure reliable delivery from Quanzhou to major US ports within standard lead times.
Technical Features
The piston converts hydraulic grease pressure into linear force against the idler yoke, keeping track tension constant without manual adjustment.
A precision-ground sealing surface works with the cylinder bore and O-ring to prevent internal bypass, maintaining pressure under shock loads.
Controlled quench and temper treatment creates a tough core and wear-resistant surface, reducing scoring during repeated extension and retraction cycles.
Applications
- Mining
- Road construction
- Quarrying
- Demolition
- Heavy earthmoving
Frequently Asked Questions
- What is the MOQ for Kobelco track cylinder pistons? Standard MOQ is 1 piece for sample orders; bulk pricing applies from 10 pieces.
- How long is delivery time? Stocked standard models ship within 7–10 days; custom production takes 20–30 days after drawing confirmation.
- What heat treatment depth do you apply? Induction hardening depth is normally 1.5–3.0 mm depending on part number; core hardness remains HRC 22–28 for toughness.
- What warranty do you provide? We provide a 12-month or 2,000-hour warranty against material and manufacturing defects under normal operating conditions.
- Can you match a Kobelco part number? Yes, send the OEM part number or drawing; our engineers cross-check dimensions and confirm compatibility before quotation.
- Are these pistons compatible with aftermarket track adjuster cylinders? Yes, they are manufactured to OEM tolerances and fit original or matched aftermarket cylinder assemblies.
Maintenance Guide
- Check track tension daily; low tension accelerates piston, seal, and bushing wear.
- Inspect grease fitting and bleed valve for leakage before adding grease.
- Use recommended lithium-based track adjuster grease to prevent seal damage.
- Measure piston rod and cylinder bore wear every 1,000 hours; replace if scoring exceeds 0.3 mm.
- Purge air from the adjuster cylinder after maintenance to maintain stable track tension.