Case-IH® Compatible Bubble Up Auger Gearbox Repair Kit (Top Box)
Restore your grain tank loading system with this premium C&M Australian-assembled bubble up auger gearbox rebuild kit. Specifically engineered for Case-IH® and New Holland® Flagship Axial-Flow combine harvesters, this kit provides an economical alternative to purchasing a complete new gearbox assembly.
The CNH bubble-up system utilizes two gearboxes on a common shaft. This exclusive C&M kit is designed specifically for the "Top Box" (OEM # 86638425) which features the splined output shaft connected to the bubble-up auger. By utilizing high-performance NSK bearings and high-temperature Viton seals, this extended wear solution ensures a longer service life for your grain handling system, keeping your machine in top condition.
CNH Gearbox OEM Cross-Reference
Refurbishment Solution for Gearbox Number: 86638425
| Part Number |
Description |
Qty |
| 87441208 |
Splined Shaft (1-1/4" x 19T x 201.3mm) |
1 |
| 87441215 |
Precision Bevel Gear Set (18T) |
2 |
| 76491H |
NSK Bearings (35mm x 72mm x 17mm C3) |
4 |
| 87441213 |
High-Temp Viton Oil Seals (35mm x 52mm x 7mm) |
2 |
| 87039408/09 |
Precision Shim Kit (Various Thicknesses) |
4 |
Case-IH® Flagship Model Compatibility
Gearbox Rebuild Compatibility: Case IH Axial-Flow Flagship Models
| Series |
Models |
Reference |
| Case-IH® 10/120 Series |
7010, 8010, 7120, 8120, 9120 |
Standard Fitment |
| Case-IH® 130/140/150 Series |
7130, 5140, 6140, 7140, 5150, 6150, 7150 |
Standard Fitment |
| Case-IH® 230/240/250 Series |
7230, 8230, 9230, 7240, 8240, 9240, 7250, 8250, 9250 |
Standard Fitment |
Technical Specifications & Features
- Manufacturer: Proudly assembled in Australia by Collier & Miller (C&M).
- Shaft Profile: 1-1/4" Diameter with 19-Tooth (19T) Spline.
- Bearings: Includes 4 x premium NSK C3 Bearings for high-speed reliability.
- Sealing: High-temperature Viton Seals to prevent oil leaks in extreme harvest conditions.
- Quality: Features genuine Comer drive components for high-strength performance.
- Dispatch: Available for fast Australia-wide shipping from Collier & Miller.
Expert Maintenance Review
The bubble up auger gearbox operates in a high-vibration environment and is subject to significant shock loads when the grain tank fills. Seal failure is a primary concern; standard seals can harden and crack, allowing oil to escape and leading to catastrophic failure of the 18T bevel gears. We recommend checking for oil residue around the 19-tooth spline output during every preventative maintenance check.
Utilising this high-performance rebuild kit allows you to restore the high-strength integrity of the gearbox for a fraction of the cost of a complete unit. By replacing the gears, shaft, and NSK bearings as a matched set, you ensure a precision fit that prevents heat buildup and ensures a longer service life for your grain handling assembly.
Installation Tip: Precision Shimming
When rebuilding the 86638425 gearbox, correct shimming is vital to ensure proper tooth contact between the bevel gears. Use the included precision shim kit to achieve the correct backlash. An incorrectly shimmed gearbox will create excessive noise and vibration, which can lead to premature gear abrasion and failure of the NSK bearings.