MacDon® & CNH Compatible Flame Hardened Center Drum Idler Sprocket
Maintain precise chain tension and smooth drive operation with this premium C&M Australian-made center drum idler sprocket. Specifically engineered for MacDon® and CNH (Case IH® and New Holland®) draper adaptors, this high-performance idler is a critical component for preventing chain slack and ensuring reliable power delivery to the center feed drum.
Manufactured in our Griffith factory, this idler features flame hardened teeth to withstand the constant friction of high-speed chain engagement. To ensure maximum reliability under load, each unit is supplied pre-assembled with a genuine Timken/Fafnir 203RR2 agricultural bearing. This extended wear solution provides a longer service life for your drive assembly, keeping your harvesting equipment in top condition.
OEM Cross-Reference
- Case IH®: 87566788
- MacDon®: 9333, MAC9333
- New Holland®: 87566788
Center Drum Idler Sprocket Compatibility: MacDon D/FD & CNH Draper Models
| Series |
Models |
Reference |
| Case IH® 21 Series |
2142, 2152, 2162 |
All Widths |
| MacDon® D & FD Series |
D50, D60, D65, FD70, FD75 |
All Widths |
| MacDon® D1, FD1 & FD2 |
D1, FD1, FD2 Series |
All Widths |
| MacDon® Adaptors |
CA20, CA25, FM100, FM200 |
Standard Fitment |
| New Holland® |
82C, 83C, 86C |
Standard Fitment |
Technical Specifications & Features
- Manufacturer: Proudly C&M Australian made by Collier & Miller.
- Function: Primary idler sprocket for the center drum chain drive assembly.
- Hardening: Flame hardened teeth for superior surface density and wear resistance.
- Bearing: Supplied with genuine Timken Fafnir 203RR2 agricultural bearing.
- Precision: High-tolerance machining for a direct-fit OEM replacement.
- Dispatch: Available for fast Australia-wide shipping from Collier & Miller.
Expert Maintenance Review
The center drum idler sprocket is a vital component for regulating chain tension. Because idlers are constantly spinning under tension in high-dust environments, the internal bearing and tooth profile are common failure points. A seized bearing or worn idler teeth can cause the drive chain to "jump" or vibrate, leading to accelerated wear on the main drive sprockets. We recommend checking the 203RR2 bearing for smooth rotation during every preventative maintenance check.
Upgrading to a flame hardened idler with a premium Timken bearing is a high-performance choice. The hardened teeth resist the "sharpening" effect of abrasive dust, while the specialized agricultural seal on the bearing prevents debris infiltration. This extended wear component ensures your chain drive remains properly tensioned, providing a high-strength solution for high-capacity harvesting.
Maintenance Tip: Verify Chain Tension
When installing a new idler sprocket, ensure the chain tensioner arm is moving freely and providing adequate pressure. An idler can only perform its role if the overall drive alignment is correct. Running a new high-performance idler with a stretched chain will lead to uneven wear patterns; always inspect the drive chain for elongation during installation.