Based on the search results, TR CU 031/2012 (TR TS 031/2012) mandates EAC Certification (CoC) for agricultural and forestry vehicles and trailers, excluding the EAC Declaration (DoC) option. Below is a structured analysis:
⚙️ 1. Core Requirements for TR CU 031/2012
Aspect    Requirement
Applicable Products    - Wheeled agricultural/forestry tractors (design speed ≥6 km/h) and trailers 
- Components: hitches, safety belts, engines, tires, lighting devices, cabins, etc. 
Exemptions    Custom-made/artistic tractors; used vehicles already in service pre-2015 
Conformity Assessment    EAC Certificate (CoC) only – DoC is not permitted 
📋 2. EAC Certification (CoC) Process
Steps:
1.Scheme Selection:
Scheme 1c: Serial production 
Scheme 3c: Individual components 
Scheme 4c: Single-unit products 
2.Testing & Audits:
Lab tests for emissions (e.g., UN/ECE Regulations 49/04, 96/02) 
Factory audits for production consistency and safety compliance 
3.Documentation:
Technical files in Russian (design specs, risk assessments) 
Test reports from EAEU-accredited labs 
4.Certification & Marking:
CoC issued by EAEU-accredited bodies 
EAC marking (min. 5 mm height) on products/packaging 
⚠️ 3. Critical Compliance Requirements
Safety Design:
Structural integrity under operational stress (e.g., vibration, corrosion) 
Mandatory safety features (e.g., seat belts, lighting, speed limiters) 
Emissions Control:
Compliance with UN/ECE emission standards effective since 2017 
Validity & Surveillance:
CoC valid up to 5 years 
Annual factory audits for serial production (Scheme 1c) 
💎 Summary
EAC Certificate (CoC) is mandatory for all tractors/trailers under TR CU 031/2012.
No EAC Declaration (DoC) option exists for this regulation .
Key steps: Lab testing, factory audits, and Russian-language technical documentation.
Timeline: 2–5 months (due to testing and audits) .
✅ Action Tip: Foreign manufacturers must partner with an EAEU-based legal entity to apply for CoC . For urgent projects, ensure emission tests align with UN/ECE standards to avoid delays.

Comparison of CoC vs. DoC Under TR CU 031/2012:

Feature    EAC Certificate (CoC)    EAC Declaration (DoC)
Applicability    Mandatory for tractors/trailers    Not permitted
Testing    Lab tests + factory audits required    N/A
Validity    Up to 5 years (with annual audits)    N/A
For detailed technical requirements (e.g., emission thresholds), consult accredited bodies like 上海经合工业 .