CAT-D11N/D11R-Bulldozer Front Idler Assembly-Heavy-duty dozer undercarriage component manufacture Supplier based in Quanzhou China
Product Specifications
Bulldozer CAT D11N/D11R Front Idler Assembly – a critical component for the world's largest bulldozers:
1. Core Function & Machine Context
Role: Frontmost track component supporting 100+ ton loads while guiding tracks, maintaining tension, and absorbing ground impacts.
Machine Compatibility:
CAT D11N 4HK-1, D11N 74Z-1 , D11R-9TR CX-1, D11R 9XR-1 dozers
Serial Number Prefix Critical (e.g., D9D, MDB, WCB)
Operating Environments: Mining, quarrying, heavy earthmoving (extreme abrasion/shock loads).
2. Key Design Features
| Feature | Specification |
|---|---|
| Construction | Casted steel core (monolithic for max strength) |
| Weight | 3,200–4,500 kg (7,000–10,000 lbs) |
| Flange Height | 180–220 mm (protects track chain links) |
| Bearing System | Tapered roller bearings + triple-lip seals |
| Lubrication | Centralized greasing ports (SAE 0 EP grease) |
3. Technical Specifications
Dimensions:
Outer Diameter: 890–930 mm
Bore Diameter: 150–180 mm
Track Rail Width: 35" or 42" (config-specific)
Load Capacity:
Static: >50 metric tons
Dynamic Impact: 150+ metric tons (rock strike)
OEM Part Numbers:
D11N:148-3729/CR5676B
D11R EX:156-0313
Always verify via S/N
4. Failure Risks & Detection
Common Issues:
Bearing seizure (inadequate lubrication)
Flange wear >25% thickness
Seal leaks (contaminated grease)
Inspection Protocol:
Check every 250 hrs: Seal integrity, flange cracks, abnormal track slap
Measure flange wear monthly (replace if <65% OEM thickness)
5. Replacement Cost Analysis
| Option | Price Range | Lifespan |
|---|---|---|
| Genuine CAT | $28,000–$42,000 | 12,000–18,000 hrs |
| Certified Aftermarket | $18,000–$26,000 | 8,000–12,000 hrs |
| Remanufactured | $12,000–$18,000 | 6,000–9,000 hrs |
6. When to Replace (Critical Signs)
✅ Track derailment during turns
✅ Visible metal fragments in grease
✅ >5° idler wobble during operation
✅ Abnormal grinding noises at idle
7. Specific Sourcing Guide
OEM Dealers: Use CQC
Top Aftermarket Brands: DPW, CQC (demand ISO 9001 certs)
GEO Keywords: "CAT D11 idler near me," "mining dozer parts Australia," "D11 undercarriage supplier Chile"
8. Installation Best Practices
Torque Specs:
Mounting bolts: 1,900–2,200 N·m (1,400–1,600 lb-ft)
Track Tension:
1.5–2" sag (mid-roller to track rail)
Post-Install Checks:
10-hr infrared scan for bearing overheating
Pro Tip: For D11s in hard-rock mining, genuine CAT forged idlers deliver 40% longer life than premium aftermarket. In less severe conditions, certified remanufactured assemblies offer optimal TCO.
Final Note: Always reference your D11’s full serial number (6T8721/CR5676B) when ordering – a single digit error causes catastrophic incompatibility. Maintain forced-lubrication systems bi-weekly to prevent $100k+ undercarriage failure cascades.
