Yanmar U-Yoke Overview
Dingtai manufactures Yanmar U-Yokes, the forged pivot component connecting the hydraulic track adjuster cylinder to the idler assembly in excavators.
We are a factory-direct manufacturer offering complete OEM casting, forging, machining, and heat treatment services to global distributors and owners.
A cracked or worn U-Yoke causes track misalignment and idler failure. Our reinforced design withstands shock loads and prevents downtime.
With over 20 years of experience and ISO9001/SGS certified processes, Dingtai guarantees consistent metallurgical quality and dimensional accuracy on every order.
We use 35MnB alloy steel and deep quenching to achieve high core strength and surface hardness, ensuring long service life.
Core Selling Points
- Premium 35MnB Material: Yokes are forged from 35MnB steel, delivering superior tensile strength and fatigue resistance compared to standard carbon steel castings.
- Precision Forging: Closed-die forging creates dense grain structure and eliminates porosity, achieving exact dimensional tolerances for direct fitment.
- 100% QC Inspection: Every U-Yoke undergoes magnetic particle testing, hardness checks, and dimensional verification before packing to guarantee zero-defect delivery.
- OEM Capabilities: We manufacture to your drawings or OEM samples, with custom machining and private labeling available for volume orders.
Our catalog of Yanmar U-Yoke includes various specifications, fully compatible with Yanmar excavators and compact equipment.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB alloy steel |
| Hardness | Core HRC 28-34; Surface HRC 45-52 |
| Process | Closed-die forging, CNC machining, induction hardening |
| Certification | ISO9001:2015, SGS |
| Warranty | 12 months against material defects |
2. OEM & Customization
We match customer drawings or original samples, customizing yoke width, pin diameter, and bolt patterns to strict OEM specifications.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Mini Excavators (1-5 ton) | Yanmar | ViO17, ViO25, ViO35, B25, B37, SV08 |
| Compact Excavators (5-10 ton) | Yanmar | ViO55, ViO80, SV100 |
4. Delivery & Logistics
We offer factory-direct pricing with flexible MOQ, fast sample dispatch, and reliable sea/air shipping through Qingdao or Xiamen ports.
Technical Features
The U-Yoke converts hydraulic force into idler movement. Forged 35MnB steel aligns grain flow along stress paths, preventing fatigue cracks under cyclical tension.
Deep quenched pin bores achieve HRC 45-52, reducing ovality and wear at the pivot joint where side loads concentrate.
CNC boring ensures coaxiality between both arms, preventing uneven load distribution and premature bushing wear during track adjustment.
Applications
- Mining and quarrying support operations
- Road construction and site preparation
- Demolition and material handling
- Utility and underground contracting
- Landscaping and agricultural drainage
Frequently Asked Questions
Q: What is your minimum order quantity for Yanmar U-Yokes?
A: Our standard MOQ is 5 units for existing patterns. For custom dimensions, MOQ is 20 units per size.
Q: What is the typical delivery time?
A: Stock samples ship within 3-5 days. Bulk production requires 25-35 days depending on order quantity and machining complexity.
Q: How deep is the heat treatment on the U-Yoke?
A: We induction harden the pin bores to a depth of 3-5 mm, achieving surface hardness of HRC 45-52 while maintaining a tough core.
Q: What warranty do you provide?
A: We provide a 12-month warranty against material defects and manufacturing faults under normal operating conditions.
Q: Can you match my Yanmar part number?
A: Yes. Send us the OEM part number or a dimensional drawing, and we will confirm exact cross-reference compatibility before production.
Q: Are your U-Yokes compatible with aftermarket idlers?
A: Our yokes are machined to OEM dimensions, so they fit both original and standard aftermarket idler assemblies.
Q: Do you offer samples before bulk orders?
A: Yes, we can provide pre-production samples for dimensional verification and hardness testing before mass production.
Maintenance Guide
- Inspection: Check pin bores for elongation and cracks every 500 hours; replace yoke if bore wear exceeds 1.5 mm.
- Installation: Align yoke arms parallel during installation; never force the pin, as misalignment causes uneven bushing load.
- Lubrication: Grease pivot pins at recommended intervals to minimize metal-to-metal contact and extend yoke bore life.
- Tension Check: Maintain proper track sag according to Yanmar specifications; over-tensioning increases stress on the U-Yoke and idler bearings.
- Replacement: Replace U-Yokes in pairs with pins and bushings when visible cracks or deformation develop, preventing sudden undercarriage failure.