We manufacture Sumitomo track cylinder pistons, precision hydraulic components that maintain correct track tension inside the track adjuster cylinder.
Our factory-direct model provides complete OEM manufacturing services for global distributors, equipment fleets, and aftermarket parts suppliers.
These pistons resist deformation and hydraulic pressure loss, preventing track derailment and premature undercarriage wear on Sumitomo excavators.
With over 20 years of production experience and ISO9001/SGS certification, we deliver repeatable quality and strict dimensional accuracy.
Forged from 35MnB steel and deep quenched, each piston achieves high surface hardness for extended service life in abrasive conditions.
Core Selling Points
- Premium 35MnB Material: High-strength boron steel provides excellent fatigue resistance and structural integrity under heavy track tension loads.
- Deep Quenching/Heat Treatment: Induction hardening creates a wear-resistant surface while preserving a tough core to resist cracking.
- Precision Forging/Casting: CNC-finished outer diameters and sealing grooves ensure exact fit, low internal leakage, and reliable cylinder performance.
- 100% QC Inspection: Every piston is checked for hardness, diameter, and surface finish before shipment, ensuring zero-defect supply.
Our catalog of Sumitomo Track Cylinder Piston includes various specifications, fully compatible with Sumitomo SH120, SH200, SH210, SH240, SH300, SH350, and SH480 excavators and bulldozers.
Why Choose Dingtai?
Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB high-strength alloy steel |
| Surface Hardness | HRC 50–55 after induction hardening |
| Heat Treatment Depth | 2–5 mm hardened case |
| Manufacturing Process | Precision forging, CNC turning, deep quenching, grinding |
| Certification | ISO9001, SGS |
| Warranty | 12 months or 2,000 operating hours |
OEM & Customization
We match customer drawings or samples, produce custom piston diameters and rod threads, and strictly follow Sumitomo OEM tolerance and surface finish standards.
Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Hydraulic Excavator | Sumitomo | SH120, SH200, SH210, SH240, SH300, SH350, SH480 |
| Mass Excavator | Sumitomo | SH210-6, SH240-5, SH300-6 |
| Demolition Excavator | Sumitomo | SH350, SH480 |
Delivery & Logistics
We offer factory-direct pricing, flexible MOQ, and reliable export packaging to US ports, reducing lead times and landed cost for procurement teams.
Technical Features
The piston converts grease pressure inside the track adjuster cylinder into linear force, keeping track tension within required limits.
Precision-ground outside diameter and hardened sealing area reduce internal oil leakage and scoring under repeated high-pressure cycles.
Deep quenching forms a wear-resistant surface while the core stays tough, preventing cracks in high-impact digging and traveling conditions.
Applications
- Mining operations
- Road construction
- Quarrying and aggregate processing
- Demolition and site clearing
- Forestry and heavy earthmoving
Frequently Asked Questions
Q: What is the MOQ for Sumitomo track cylinder pistons?
A: Standard MOQ is 10 pieces, but sample orders are available for first inspection and fitment verification.
Q: How long is delivery?
A: Stock samples ship within 7 days; bulk production orders typically ship within 25–35 days.
Q: What is the heat treatment depth?
A: Induction hardening depth is generally 2–5 mm depending on piston dimensions, with surface hardness HRC 50–55.
Q: What warranty do you provide?
A: We provide a 12-month or 2,000-hour warranty against material and manufacturing defects under normal operating conditions.
Q: Can you match OEM part numbers?
A: Yes. Send the Sumitomo part number or a drawing, and we cross-reference dimensions to supply the correct piston.
Q: Are these pistons compatible with aftermarket cylinders?
A: Yes, they are produced to OEM bore and rod specifications for direct replacement in original or aftermarket cylinders.
Q: What material do you use?
A: We use 35MnB boron steel, selected for high fatigue strength and resistance to hydraulic pressure and shock loads.
Maintenance Guide
- Clean the cylinder bore and inspect the piston surface for scoring, rust, or chrome damage before installation.
- Lubricate seals and O-rings with clean grease, then align the piston squarely to avoid rod binding during assembly.
- Check track sag after the first 50 operating hours and adjust grease pressure if sag exceeds manufacturer limits.
- Replace pistons when hard chrome wear exceeds 0.3 mm or when external leakage and tension loss occur.