Dingtai manufactures Sumitomo U-Yoke components, forged structural connectors that secure the front idler assembly to the excavator track frame.
Factory direct production supports complete OEM manufacturing services, precision CNC machining, and consistent global supply for distributors and equipment fleets.
High fatigue strength and tight tolerances reduce cracking, misalignment, and unplanned downtime during demanding earthmoving operations.
Dingtai brings 20+ years of undercarriage component expertise, with ISO9001 and SGS certified quality systems controlling production and traceability.
Premium 35MnB steel with deep heat treatment and precision forging delivers high tensile strength and extended service life.
Core Selling Points
- Premium 35MnB Material — Alloy steel provides high tensile strength and fatigue resistance, suitable for heavy impact loads in excavator undercarriage systems.
- Deep Quenching/Heat Treatment — Controlled deep hardening creates a hard surface and tough core, improving resistance to wear, deformation, and cracking.
- Precision Forging/Casting — Forged grain flow follows load paths, producing dense steel structure with fewer internal defects than standard castings.
- 100% QC Inspection — Every U-yoke passes dimensional checks, hardness testing, and surface inspection before packaging and shipment.
Our catalog of Sumitomo U-Yoke includes various specifications, fully compatible with Sumitomo excavators and bulldozers.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB / 40Cr alloy steel |
| Hardness | Surface HRC 42–52; core HB 220–280 |
| Heat Treatment | Deep quenching and tempering |
| Process | Precision forging, CNC machining |
| Certification | ISO9001:2015, SGS |
| Warranty | 12 months or 2,000 working hours against manufacturing defects |
2. OEM & Customization
We match customer drawings, produce custom yoke dimensions, and strictly follow OEM standards for Sumitomo-compatible parts.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Hydraulic Excavator | Sumitomo | SH75X, SH130, SH210, SH240, SH300, SH350, SH480 |
| Hydraulic Excavator | Sumitomo | SH200-5, SH220-5, SH240-5, SH300-5, SH350-5 |
| Undercarriage Retrofit | Aftermarket OEM | Custom U-yoke assemblies per drawing |
4. Delivery & Logistics
We provide reliable sea and air shipping, factory-direct pricing, and flexible MOQ starting from small trial orders to bulk programs.
Technical Features
Forged 35MnB steel aligns grain structure with primary load paths, reducing stress concentration and improving fatigue life under cyclic loads.
Deep quenching creates a wear-resistant surface layer while maintaining a ductile core, preventing brittle fracture under high impact conditions.
Precision machined bores and faces ensure correct idler alignment, reduce side loading, and extend adjacent undercarriage component service intervals.
Applications
- Mining
- Road Construction
- Quarrying
- Demolition
- Heavy Earthmoving
- Infrastructure Projects
Frequently Asked Questions
What is the minimum order quantity for Sumitomo U-yoke parts?
MOQ is flexible, typically 1–10 units for trial orders depending on stock availability and custom specifications.
What is the normal delivery time?
Stock parts ship within 7–15 days. Custom manufacturing typically takes 25–35 days after drawing approval.
How deep is the heat treatment on the U-yoke?
Surface hardening depth is normally 4–8 mm after quenching and tempering, depending on yoke size and load requirements.
What warranty do you provide?
We offer 12 months or 2,000 working hours warranty against material and manufacturing defects under normal use.
Can you produce from our part number or drawing?
Yes. Send original part numbers, dimensional drawings, or samples; we match OEM specifications and confirm before production.
Do you inspect every U-yoke before shipment?
Yes, 100% dimensional, hardness, and surface inspection is completed, with reports available on request.
What material is used for the Sumitomo U-yoke?
We use 35MnB or 40Cr alloy steel depending on the original equipment specification and operating conditions.
Maintenance Guide
- Pre-installation inspection: Check yoke bores, bolt holes, and mating surfaces for cracks, corrosion, or deformation before installation.
- Torque verification: Tighten mounting hardware to OEM specified torque values; recheck after the first 50 operating hours.
- Wear monitoring: Inspect idler alignment and yoke clearance every 250 hours or during planned undercarriage service intervals.
- Replacement: Replace yokes showing visible cracks, elongated bores, or distortion above OEM tolerances to prevent track frame damage.