John Deere® Compatible Hex Roller Drive Bar
Restore positive drive to your module building system with this premium C&M Australian-made hex roller drive bar. Specifically engineered for the front rollers of John Deere® cotton picker round module builders, this high-performance drive shaft provides the critical connection required for consistent belt timing and module formation.
Manufactured in our Griffith factory from grade 4140 bright hex steel, this bar offers superior torsional strength and resistance to rounding compared to standard carbon steel. Each unit is precision-drilled to accommodate both standard and upgrade roll pin locations and comes supplied with four high-strength roll pins. This extended wear solution ensures a longer service life for your drive assembly, keeping your cotton picker in top condition.
John Deere® OEM Cross-Reference
Replaces OEM Part Number: KK21670
Hex Drive Bar Compatibility: John Deere 7760 & CP690 Models
| Series |
Models |
Reference |
| John Deere® 7700 Series |
7760 Cotton Picker |
Standard Fitment |
| John Deere® CP Series |
CP690 Cotton Picker |
Standard Fitment |
Technical Specifications & Features
- Manufacturer: Proudly C&M Australian made by Collier & Miller.
- Material: High-grade 4140 Chrome-Moly Hex Shaft for maximum toughness.
- Length: 272mm precision cut.
- Versatility: Drilled to fit both standard and upgraded roll pin configurations.
- Inclusions: Supplied with 4 x high-strength roll pins for immediate installation.
- Dispatch: Available for fast Australia-wide shipping from Collier & Miller.
Expert Maintenance Review
The hex roller drive bar is the primary link between the drive sprockets and the builder rollers. Due to the high-torque start-stop nature of the module building process, standard hex bars can suffer from abrasion and fatigue at the roll pin holes, leading to "slop" in the drive system. We recommend inspecting the roll pin holes for elongation during every preventative maintenance check.
Upgrading to this 4140 alloy drive bar is a high-performance choice to **save money** on future drive repairs. The superior material hardness ensures the hex corners remain sharp and the roll pin holes remain tight, maintaining precise timing for module formation and ensuring a longer service life for your sprockets and rollers.
Installation Tip: Check Sprocket Hubs
When installing a new KK21670 hex bar, always take the time to inspect the internal hex of your drive sprockets. If the sprocket hubs are already rounded, they will place uneven stress on the new 4140 bar, leading to premature roll pin failure. Ensuring a tight, high-strength fit across the entire hex assembly is vital for a reliable cotton harvest.