Motor Grader Gear Shaft – Tooth, Spline and Journal Guide
A gear shaft combines torque-transmitting teeth with bearing and shaft interfaces. Correct motor grader fitment requires the exact assembly position, gear geometry, splines, journals, shoulders and retention—not only overall length.
Gear shaft identification table
| Feature | Record |
|---|
| Gear section | Tooth count, pitch or module, face width, helix direction if applicable and mating gear |
| Spline section | Tooth count, diameters, working length and connected component |
| Journals | Bearing codes, seat diameters/lengths and shoulder positions |
| Ends | Threads, grooves, keys, pilots, nuts and other retention |
| Axial geometry | Total length, gear-to-shoulder distances, spacers and seal lands |
How should damage be interpreted?
Pitting or spalling can point to load or lubrication issues. Tooth-edge contact may indicate alignment error. Fretted splines suggest movement, and blue journals indicate heat. Inspect the mating gear, bearings, oil supply and housing alignment so the failure does not repeat.
Installation planning
Keep shims and spacers identified. Use the specified bearing installation and preload or end-play procedure. Verify gear contact, backlash and free rotation before closing the assembly, then use the specified lubricant.
Related gear and shaft pages
Compare the intermediate shaft guide and the slewing gear ring page. Their components serve different locations and are not claimed interchangeable.
FAQ
Is tooth count enough to identify the gear shaft?
No. Tooth form, face width, splines, journals and axial geometry must also match.
Should the mating gear be inspected?
Yes. A damaged mating gear can mark a new shaft quickly.
Why retain shim order during teardown?
Shims may control gear position, bearing preload and contact pattern.
Compatibility note: Confirm the gear shaft within its exact transmission or drivetrain assembly before ordering.
