Quick checks before you begin
- Set one service-ready date for each sales territory rather than one global season date
- List the machines and row-unit systems actually supported before choosing stock depth
- Keep customer commitments, historical consumption and planning assumptions in separate columns
- Map the complete replenishment lead time, including receiving inspection and local delivery
- Exclude reserved, quarantined, damaged and identity-uncertain parts from usable stock
- Review the plan against current harvest progress and actual issues throughout the season
Anchor the plan to a service-ready date
A distributor does not need parts merely delivered to a port before harvest. The stock has to be technically confirmed, received, inspected, labelled, released and positioned where customers can obtain it before likely field demand begins. Define that point as the service-ready date for each territory or branch.
USDA NASS publishes national and state crop-progress information for the United States, including cotton harvest progress and usual planting and harvesting dates. It is a regional timing signal, not a universal forecast. Dealers in other countries should use the corresponding local agricultural authority, customer crop stage and field-service information.
| Planning event | Evidence required | Decision |
|---|---|---|
| Expected first field demand | Local crop progress, customer harvest plan and prior service dates | Set the territory service-ready date |
| Customer inspection cut-off | Completed preseason findings and approved replacement lists | Separate known demand from forecast demand |
| Receiving-release date | Inbound date plus time for identity, quantity and quality checks | Do not count uninspected parts as available |
| Required-arrival date | Transport, customs, domestic transfer and disruption allowance approved by the buyer | Set the latest acceptable supplier dispatch date |
| Purchase-release date | Technical confirmation, production, documentation and export preparation time | Release the order before the total lead-time window closes |
Crop maturity, defoliation, weather, machine workload and transport conditions change the demand window. Recalculate the service-ready date for every territory and season.
Build the installed-base ledger before forecasting parts
The installed-base ledger is the denominator of the stock plan. Record only machines that the distributor or service network can support with credible identification. A broad statement that a region operates cotton pickers is not enough to choose hand, bore, gear form or assembly level.
Cotton Incorporated notes that opposed-drum and in-line row-unit arrangements can use different handed components and that wrong-handed spindle installation can damage related wear parts. Keep configuration evidence visible in the inventory plan instead of hiding it inside a total spindle quantity.
| Installed-base field | Minimum record | Planning use |
|---|---|---|
| Customer and location | Account, branch, farm or service territory | Assign stock to the point of demand |
| Machine identity | Manufacturer system, machine identification and current reference evidence | Prevent unsupported model assumptions |
| Row-unit context | Number of supported machines, row units and known drum arrangement | Estimate exposure without claiming consumption |
| Configuration | RH/LH, bore, assembly level, gear form or other controlled variant | Split stock into orderable SKUs |
| Service state | Operating, standby, overhaul, sold or out of service | Exclude inactive exposure |
| Evidence date | Who confirmed the record, how and when | Identify stale installed-base data |
| Season plan | Expected operating window and workload supplied by the customer | Prioritize review and delivery timing |
Mark each machine record confirmed, pending or historical. Pending records can trigger a customer follow-up, but they should not silently become committed stock demand.
Convert service evidence into demand without counting interest as consumption
Use a demand ladder. Customer purchase commitments and approved preseason replacement lists are stronger than last-season issues; last-season issues are stronger than unqualified forecasts; quotations, page visits and keyword volume are commercial interest, not physical consumption.
Clean the history before using it. Separate emergency transfers, returns, warranty replacements, duplicate sales lines, one-time rebuild projects and lost sales. Keep both the original transaction and the planning adjustment so the forecast remains auditable.
| Demand signal | Planning status | Control |
|---|---|---|
| Customer purchase order or reserved allocation | Committed | Confirm reference, configuration, quantity and required date |
| Approved preseason inspection list | High-confidence planned demand | Link every line to the inspected machine and service decision |
| Verified customer forecast | Forecast | Record customer, period, assumptions and confidence |
| Last-season issued quantity | Historical baseline input | Adjust for returns, one-time events and installed-base change |
| Emergency order or transfer | Exception evidence | Decide whether the cause is recurring or unusual |
| Quotation or enquiry | Commercial pipeline only | Do not count until identity, timing and probability are reviewed |
| Website traffic or keyword volume | Market-interest signal only | Never convert directly into units of stock |
A customer inspection list, quotation and later purchase order may describe the same requirement. Preserve the history, but allow only one active quantity in the stock plan.
Rank stock by field consequence and configuration risk
Price alone is a weak stocking priority. A low-cost part can stop a machine, while an expensive assembly may be low frequency and highly configuration-sensitive. Rate each SKU using field consequence, observed usage, replenishment difficulty, substitution risk, customer commitment and obsolescence exposure.
Cotton Incorporated preseason guidance identifies spindles, spindle bushings, picker bars, doffers, moistening components and related row-unit parts as connected maintenance systems. That relationship supports system-level planning, but it does not prove that every distributor should hold each item at the same depth.
| Planning class | Typical evidence pattern | Stock treatment |
|---|---|---|
| Field-stop critical | Confirmed machine exposure, credible failure or wear history, and no acceptable local recovery path | Authorize a defined reserve and protect it from casual allocation |
| Frequent wear | Repeated issues across confirmed machines and a stable part identity | Plan base stock plus dated replenishment reviews |
| Service-enabling | Needed with another part or service event but less frequently issued alone | Plan against service packs or committed overhaul work |
| Configuration-sensitive | RH/LH, bore, gear geometry, assembly level or machine evidence changes the order | Hold only where installed-base evidence supports it; otherwise order to confirm |
| Low-frequency or obsolescence risk | Sparse demand, uncertain machine status or supersession exposure | Use supplier availability, shared stock or customer commitment before purchase |
The same part can be frequent in one dealer area and order-to-confirm in another. Reclassify it when the installed base, customer workload or replenishment route changes.
Calculate a net requirement with named inputs
Build the gross seasonal requirement from four separately visible inputs: committed customer allocations, approved inspection replacements, an evidence-adjusted historical baseline and an authorized contingency. Then subtract released usable stock and firm inbound supply that will arrive before the service-ready date.
This is a worksheet structure, not a universal formula for stock depth. Define the unit of measure for every line. A bare spindle, spindle assembly, doffer, doffer column, individual gear and service kit are not interchangeable units.
| Worksheet input | Include | Exclude or show separately |
|---|---|---|
| Committed allocation | Confirmed customer, exact SKU, quantity and need date | Unverified verbal interest |
| Inspection replacement | Approved line linked to a machine and service record | Items still awaiting technical review |
| Historical baseline | Clean issued or consumed quantity for comparable exposure | Returns, duplicate lines and one-time rebuilds |
| Authorized contingency | Named risk, owner, quantity and release rule | Hidden padding added to every line |
| Released usable stock | Correct identity, accepted condition and available location | Reserved, quarantine, damaged or uncertain stock |
| Firm inbound | Confirmed SKU, quantity and date inside the required window | Unconfirmed capacity or late shipment |
| Net buy | Gross requirement less usable stock and qualifying inbound | Negative values converted into extra purchases |
A buyer should be able to trace every planned unit to a commitment, inspection, historical baseline or approved risk reserve and see exactly what stock was deducted.
Plan around service events, then purchase by exact SKU
A preseason overhaul or field repair may touch several connected wear systems. Use a service-event worksheet to expose missing companion parts, tools, documents or skilled labor before the machine is opened. The purchase order must still list each exact part and configuration separately.
John Deere's CP690 replacement-parts guide is one example of an OEM parts map that separates spindles, spindle assemblies, spindle nuts, drive gears, doffers, moistener parts and picker-bar components. Use the current catalog for the actual machine being supported; do not copy one model's list into a universal kit.
| Service event | Planning question | Required boundary |
|---|---|---|
| Spindle replacement | Bare spindle or assembly, hand, quantity and confirmed interface? | Keep bare and assembled stock separate |
| Doffer work | Individual doffer, column-level work or associated retainers and shims? | Confirm bore and shaft or column context |
| Moistener service | Pad, holder, nozzle, strainer or complete column issue? | Separate fluid-delivery faults from pad wear |
| Picker-bar repair | Bar, bushing, bearing, drive shaft or gear evidence? | Qualified repair review is required |
| Drive-part replacement | Spur or bevel gear, tooth form, bore, holes and mating context? | No visual substitution by approximate size |
| Mixed preseason order | Can every line be linked to a machine, stock policy or customer commitment? | Do not hide uncertain parts in a generic kit |
Map the full replenishment lead time
Supplier production time is only one segment. Record the expected duration, owner, evidence and latest completion date for technical confirmation, sample or drawing review, production, inspection, document approval, export preparation, transport, customs, receiving inspection and branch delivery.
Use actual supplier and logistics history where available. Keep the baseline lead time, current confirmed lead time and disruption allowance separate. A single average can hide the stage that threatens the service-ready date.
| Lead-time segment | Evidence | Release question |
|---|---|---|
| Technical confirmation | Approved reference, photos, sample, drawing and variant record | Is the order definition complete? |
| Supplier commitment | Acknowledged quantity, production slot and dispatch date | Is capacity confirmed rather than quoted? |
| Production and inspection | Milestones, inspection plan and document schedule | Can the buyer review exceptions before dispatch? |
| Export preparation | Packing, labels, commercial documents and booking | Are quantity and carton identity reconciled? |
| International movement | Mode, route, handoffs and current ETA | What event changes the recovery plan? |
| Customs and domestic transfer | Importer readiness, broker status and branch routing | Is local delivery inside the demand window? |
| Receiving release | Identity, quantity, condition and required quality checks | When does physical stock become usable stock? |
Parts at a port, broker, receiving dock or inspection hold are not service-ready inventory. Report them as inbound or receiving hold until authorized release.
Protect separate inventory buckets
A useful available balance is smaller than the physical count. Inventory status must prevent customer-reserved, inspection-hold, quarantined, damaged, returned and identity-uncertain parts from being promised twice or issued accidentally.
Use one status owner and one disposition record. Relabelling or moving a part does not restore technical identity unless the supporting evidence is complete and an authorized reviewer releases it.
| Inventory bucket | May be promised? | Control |
|---|---|---|
| Released available | Yes | Correct identity, accepted condition and known location |
| Customer reserved | Only to the assigned customer | Allocation, expiry or release authority recorded |
| Emergency reserve | Only under the approved release rule | Named risk, owner and minimum protected quantity |
| Receiving hold | No | Await identity, quantity and quality release |
| Quarantine | No | Nonconformance or uncertainty blocks issue |
| Return pending review | No | Preserve customer, reason, condition and lot evidence |
| Obsolete or superseded review | No | Confirm current relationship before any sale |
Release stock in controlled waves when uncertainty is material
A single large preseason order can lock in the wrong mix before machine records and inspection findings are complete. Where supplier minimums, logistics economics and season timing permit, separate validation, base-stock and balancing decisions.
Wave planning does not mean waiting until harvest. Every wave must still fit the full replenishment lead time and service-ready date.
| Purchase wave | Purpose | Release evidence |
|---|---|---|
| Validation | Confirm new supplier, new part, changed reference or uncertain configuration | Approved sample, technical evidence and defined review outcome |
| Base stock | Cover committed and high-confidence demand | Installed base, cleaned history, service findings and lead-time map |
| Balancing order | Correct the mix after later inspections or customer commitments | Updated net requirement and confirmed delivery inside the season window |
| In-season replenishment | Restore consumed stock or respond to changing field demand | Actual issues, usable balance, harvest progress and firm ETA |
| Post-season carryover | Retain only stock with continuing identity and demand | Cycle count, condition, supersession and next-season exposure |
Review actual issues against harvest progress during the season
Cotton Incorporated emphasizes maintenance and service procedures as a way to reduce harvester downtime. During harvest, the distributor should combine field-service findings with stock transactions instead of waiting for an end-of-season sales report.
Review by territory and exact SKU. A regional harvest-progress report can help explain whether low issues mean low demand, a later crop or a lost customer, but it cannot prove future consumption by itself.
| Review signal | Question | Action boundary |
|---|---|---|
| Released balance | How much can be promised now? | Exclude every blocked bucket |
| Issues and customer deliveries | Which exact SKUs are leaving and for which machines? | Check for duplicate or abnormal transactions |
| Emergency requests | Is the cause wear, misidentification, accident, shortage or one-time overhaul? | Do not convert every exception into permanent base stock |
| Returns and failures | Is there an identity, fitment, quality or service problem? | Quarantine affected stock and preserve evidence |
| Harvest progress | Is field demand starting, peaking, delayed or ending in this territory? | Use the local authoritative source and customer updates |
| Supplier status | Can the next approved replenishment still arrive in time? | Escalate before the service window is missed |
Save each review's demand, stock and ETA snapshot. Rewriting one live spreadsheet removes the evidence needed to understand why the plan changed.
Control shortage decisions without creating a fitment problem
- Confirm the requested part, supply form, configuration, machine context and required date before allocating scarce stock.
- Protect customer-reserved stock and release emergency reserve only under its authorized rule.
- Check released stock at other branches, but preserve lot and inventory status during transfer.
- Ask the approved supplier for a confirmed recovery date for the same controlled item.
- Offer split shipment only when the customer accepts the quantity and schedule.
- Communicate the confirmed available quantity, evidence gaps and ETA without promising an unverified substitute.
- Record lost demand and the root cause separately from completed sales.
Do not change RH/LH hand, bore, tooth form, assembly level, reference relationship, material or other controlled characteristic without an authorized technical decision.
Close the season with evidence for the next plan
The next preseason plan should begin with a controlled season close. Count physical stock by status, reconcile transactions, review emergency orders and returns, confirm supersessions and compare the plan with actual demand.
ISO 55002 provides general guidance for risk-based asset management across physical assets. It does not prescribe a cotton picker spare-parts formula. Use the risk-management principle to document why stock is retained, reduced, reclassified or removed.
| Close-out record | Review | Next-season use |
|---|---|---|
| Physical and system count | Quantity by SKU, lot, location and status | Correct the opening usable balance |
| Forecast versus actual | Committed, planned, issued, returned, lost and remaining | Identify bias and double counting |
| Service exceptions | Breakdowns, urgent transfers and unplanned overhaul work | Separate recurring risk from isolated events |
| Customer and machine changes | New, inactive, sold or relocated machines | Update installed-base exposure |
| Reference and supplier changes | Supersession, packaging, MOQ, lead time or quality changes | Revalidate the replenishment plan |
| Carryover condition | Identity, preservation, corrosion, damage and document status | Release, rework, quarantine or dispose through authority |
Send a season-dated order brief to the supplier
A useful request tells the supplier what must be available, how it is identified and when it must be released at the distributor. Include the required arrival date rather than asking only for the fastest lead time.
For uncertain lines, send the available reference, supply form, machine and row-unit context, clear photographs, controlled sample or drawing evidence and destination. Ask the supplier to identify technical or capacity conflicts before production.
- Distributor and delivery location, including importer or branch requirements.
- Exact part description, reference evidence, bare or assembled form and controlled variant.
- Quantity by line, unit of measure and whether it is committed, base stock or reserve.
- Required supplier dispatch, destination arrival and service-ready dates.
- Packing, lot labels, quantity per carton and document requirements.
- Inspection, sample approval or change-control requirements where applicable.
- Approved split-shipment rule and contact for technical exceptions.
A fast shipment of the wrong configuration is not useful stock. The supplier acknowledgement should confirm both the technical order and the dated delivery commitment.
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
- In-Season Procedures for Spindle-Type Cotton HarvestersCotton Incorporated | technical guideOpen source
- Maximizing Spindle Harvester Capacity and ProductivityCotton Incorporated | technical guideOpen source
- National Crop Progress reports and harvest timing resourcesUSDA National Agricultural Statistics Service | technical guideOpen source
- CP690 Cotton Picker Replacement Parts GuideJohn Deere | technical guideOpen source
- John Deere Parts Catalog: Cotton Parts and AttachmentsJohn Deere | technical guideOpen source
- ISO 55002:2018: Guidelines for applying an asset management systemInternational Organization for Standardization | technical guideOpen source
- Cotton picker parts inquiry data standardYUCHENG HARVEST | internal standardOpen workflow
Questions buyers and technicians ask
How many months before harvest should a distributor order cotton picker parts?
There is no universal number. Set the local service-ready date and work backward through technical confirmation, supplier production, inspection, export preparation, transport, customs, receiving inspection and branch delivery using current evidence.
Which cotton picker parts should be stocked deepest?
Use confirmed installed-base exposure, cleaned issue history, preseason inspection findings, replenishment difficulty and field consequence. A frequently used part in one territory may be order-to-confirm in another.
Can Google searches or quotation volume be used as parts demand?
They can show commercial interest, but they are not physical consumption. Keep traffic and quotations separate from customer commitments, approved service findings and actual issued quantities.
Should bare spindles and spindle assemblies share one inventory quantity?
No. They are different supply forms and SKUs. Keep their demand, stock, packaging and customer allocation separate even when they support the same service system.
Can receiving-hold or quarantine stock be counted as available?
No. Count only correctly identified, accepted and released stock as available. Show receiving hold, quarantine, customer reserve, returns and damaged stock in separate buckets.
How should crop-progress data be used?
Use the relevant official regional source as a timing signal alongside customer crop stage and service information. Crop progress does not identify machines, part configurations or unit demand.
What should a distributor do when the customer cannot identify the part?
Collect the machine and row-unit context, installed reference, supply form, position, clear photographs and available sample or measurements. Keep the line pending until a qualified technical review confirms the order.
Does a stocking plan replace the machine service manual?
No. Inventory planning does not authorize removal, adjustment, installation or substitution. Qualified personnel must use the current machine documentation and applicable safety procedures.