Quick checks before you begin
- Photograph the complete column
- Mark top, middle and bottom
- Compare with another row
- Inspect related spindle and contact patterns
Create a wear map before removing the column
Mark the top, middle and bottom of the column and photograph both visible sides. Record whether the worn band aligns with a particular spindle height or picker bar. Once parts are mixed on the bench, this positional evidence is lost.
Use the pattern to choose the next inspection
| Wear pattern | Inspect next | Reason |
|---|---|---|
| One horizontal band | Corresponding spindle/bar position and contact marks | Damage may repeat at one height |
| One side of column | Alignment and mounting evidence | Side loading may not be uniform |
| Lower section heavier | Crop exposure, spindle wear and geometry | Lower work zone often sees more material |
| All columns similar | Service life, material and system settings | Pattern may be fleet-wide rather than isolated |
Include picker-bar height in the technical review
Technical harvester guidance emphasizes uniform picker-bar height because a low or high bar can affect the relationship between spindles and doffers. This is a qualified-service check, not an invitation to adjust by eye.
Save height and contact evidence with the exact machine model and manual revision used by the technician.
Abnormal noise, heat, polished marks or rapid localized damage should trigger the machine's stop and service procedure.
Separate a product issue from a system issue
For a supplier quality claim, retain labeled new and used samples, purchase-lot data and the positional wear map. A complete record protects both buyer and supplier from attributing a system alignment problem to material, or a material problem to the machine, without evidence.
Technical basis for this article
The article paraphrases and organizes the sources below. It does not copy a service manual, and it does not replace the current documentation for the exact machine.
- Preseason Procedures for Spindle-Type Cotton HarvestersCotton Incorporated | technical guideOpen source
- Spindle Picker Harvesting technical guideOklahoma State University Extension document library | extension publicationOpen source
Questions buyers and technicians ask
Does uneven wear prove the doffer material is bad?
No. Material is one possibility, but alignment, bar height, contact and loading pattern must also be checked.
Why photograph before disassembly?
The location of damage within the row unit is diagnostic evidence and cannot be reconstructed reliably after parts are mixed.
What should be included in a supplier claim?
Include lot and order data, labeled samples, position map, operating history, photos and any qualified inspection findings.