Understanding the Terminology
Before comparing options, it helps to understand what these terms actually mean:
OEM (Original Equipment Manufacturer) Parts: Parts made by the same company that built the machine — or made to the exact same specification under licence. A Cat part number ordered from a Cat dealer is an OEM part.
OEM-Equivalent Aftermarket Parts: Parts manufactured by independent companies to match OEM specifications in dimensions, material grade, heat treatment and tolerances. Quality OEM-equivalent parts perform identically to OEM in service.
Low-Cost Generic Parts: Parts manufactured to a lower specification, often with inferior steel grades, incorrect heat treatment or dimensional tolerances outside OEM limits. These are the parts that give aftermarket a bad reputation.
The Real Cost of Parts
Price is only one component of the true cost of a part. The real calculation is:
Total Cost = Purchase Price ÷ Service Hours Delivered
A low-cost tooth that lasts 100 hours at $15 costs $0.15 per hour. A quality OEM-equivalent tooth that lasts 300 hours at $25 costs $0.083 per hour.
The cheap part costs nearly twice as much when measured correctly.
Where OEM Parts Make Sense
OEM parts are the right choice when:
1. Warranty Requirements
New machines under dealer warranty typically require OEM parts for warranty maintenance. Using non-OEM parts can void warranty coverage on affected systems.
2. Complex Electronic and Hydraulic Systems
Modern mining equipment uses sophisticated electronic control systems. OEM sensors, control modules and hydraulic components are calibrated specifically for each machine platform.
3. High-Risk Structural Components
Safety-critical components — including structural pins, boom components and track frame hardware — should always be OEM or certified equivalent from a reputable supplier.
4. Very New Machine Models
For recently released machine models, OEM-equivalent alternatives may not yet be available. Aftermarket manufacturers typically take 12-24 months to reverse-engineer and qualify new components.
Where OEM-Equivalent Aftermarket Makes Sense
Quality aftermarket parts deliver excellent value in these applications:
1. Undercarriage Components
Track chains, rollers, idlers and sprockets are high-wear, high-cost items. OEM-equivalent undercarriage from qualified manufacturers can deliver identical service life at 30-50% lower cost.
2. Ground Engaging Tools (GET)
Bucket teeth, adapters, cutting edges and wear plates are consumable items replaced frequently. Quality aftermarket GET is widely used across the Australian mining industry.
3. Engine Consumables
Filters, gaskets, seals and belts from quality aftermarket suppliers meet or exceed OEM specifications at significant savings.
4. Wear Parts and Liners
Wear plates, chocky bars and bucket liners are ideal candidates for aftermarket sourcing. Material grade and hardness specification are the key quality factors.
5. Older Machine Fleets
For machines over 10 years old, OEM parts may have long lead times or be discontinued. Quality aftermarket sourcing keeps older equipment running cost-effectively.
How to Identify Quality Aftermarket Parts
Not all aftermarket is equal. Here is how to assess supplier quality:
Material Certification
- Request mill certificates confirming steel grade
- For undercarriage: confirm carbon content and hardenability specifications
- For GET: confirm Brinell hardness rating
Dimensional Verification
- Request dimensional drawings confirming OEM specification compliance
- Critical dimensions include bore sizes, pin diameters and mounting interfaces
Manufacturing Standards
- ISO 9001 certified manufacturing
- Heat treatment documentation
- Surface hardness testing results
Track Record
- How long has the supplier been manufacturing this part?
- What mining companies are using their products?
- Can they provide references from Australian operations?
The Sourcing Process — How Mining Machine Parts Works
At Mining Machine Parts, our sourcing process ensures quality:
- Specification confirmation — we obtain the OEM part number and full dimensional specification
- Supplier qualification — we verify manufacturer capability, certifications and track record
- Sample inspection — critical dimensions and material specifications are verified before order placement
- Quality documentation — full material and dimensional certification accompanies every order
- Performance tracking — we follow up with customers to track real-world service life
Key Takeaways
- OEM-equivalent does not mean inferior — quality aftermarket parts match OEM performance
- Price per hour is the right metric — not purchase price alone
- Know your application — safety-critical and warranty components warrant OEM; wear parts and consumables are ideal for quality aftermarket
- Supplier qualification matters — ask for material certifications and dimensional verification
- Australian mining operations routinely use quality aftermarket parts to manage maintenance costs without compromising reliability
Ready to Source Quality Parts?
Mining Machine Parts specialises in sourcing OEM-equivalent replacement parts for Cat, Komatsu, Hitachi, Volvo and Hyundai mining equipment. Every part we source is technically verified against OEM specifications.
Contact us to discuss your parts requirements.