Why a mixed fleet breaks a single-brand stock plan
When every machine is the same brand, the parts list is essentially one long catalog with a demand history attached to it. Add a second and a third brand and the same shelf has to serve several part-number systems, several lead times and several failure patterns, and the simple rule that worked before — hold what moves — stops giving sensible answers.
The mistake most buyers make is to build one list and stock it to the same depth everywhere. That produces a shelf that is overstocked on the expensive, slow-moving assemblies of the brand least represented in the fleet, and out of stock on the cheap consumables that every brand uses.
Start with the machine list, not the parts list
A stock plan is a statement about machines, so the machine list comes first. Write down every unit the operation expects to see this year: make, model, serial range, hours, and how critical it is. Two facts matter most — how many units of each model are in service, and whether the operation can tolerate that model being down.
Once that list exists, the plan almost writes itself at the category level. A model with eight units in daily service justifies depth. A model with one unit that only works in the busy season justifies a conversation with a supplier rather than a shelf. Guangzhou Shenyue Machinery Technology Co., Ltd. plans its own stock on that split, and quotes buyers on the same basis.
Sort the fleet into two activity classes. Machines that must not stop — the ones holding a contract, a quarry face or a production line — get planned the way a single-machine owner plans. Machines that can wait a day or two can rely on available-to-order parts and a lead time that has been written into the maintenance plan rather than discovered during a breakdown.
Group the BOM by function, not by brand
The fastest saving in a mixed fleet is in the items every brand uses. Filters, seals, O-rings, hoses and fittings, fasteners, batteries, lubricants and ground-engaging wear parts are specified differently by brand but bought the same way. A BOM organized by function lets you see those lines together, buy them in depth across the whole fleet, and stop holding six small stocks of the same type of item.
A useful layout is three columns: the function, the machines that use it, and whether the line is shared or brand-specific. Shared lines are worth stocking deeply, because demand from several models lands on one shelf position. Brand-specific lines are planned per machine, because their demand is as thin as the units behind it.
Safety stock in plain terms
Safety stock is not a feeling about what might run out. It is a buffer sized to two things: how long a line takes to arrive, and how much the usage varies week to week. A line with a three-day lead time and steady usage needs almost no buffer. The same part with a six-week lead time and lumpy usage needs several weeks of cover, or a decision not to rely on it at all.
For a mixed fleet, apply the two tests where they belong. Shared consumables are cheap and cross-referenced, so the buffer is a fixed quantity on the shelf. Brand-specific assemblies are expensive and slow, so the buffer is almost always zero and the plan is a lead time the schedule accounts for. The failure mode to avoid is treating a six-week assembly as though it were a three-day filter.
How we fit into that plan
Guangzhou Shenyue Machinery Technology Co., Ltd. supplies workshops, traders, rental fleets and contractors from Guangzhou, and has done so since 2007. Four warehouses hold 3,000+ part types on the shelf, with 100,000+ part numbers available to order through original supply channels — which is the same structure a mixed fleet ends up building for itself, fast movers held locally and slow movers sourced on demand.
We are an independent supplier and hold formal authorization for five brands: Garrett, Mitsubishi Heavy Industries, TONGMYUNG, NIKURA and Marusan. For Kobelco and the other machine brands we are not an authorized dealer; we supply those as genuine parts through original supply channels, or as OEM-quality and aftermarket equivalents, and every line on a quotation states which of the three it is.
Where each class of line belongs
| Class of line | Best held |
|---|---|
| Shared consumables (filters, seals, hoses, fasteners) | On the shelf across the whole fleet, bought in depth. |
| Ground-engaging wear parts | On the shelf in the sizes actually used, not in every size. |
| Brand-specific sensors and relays | A small buffer on the shelf; the rest available to order. |
| Injectors and turbochargers | Available to order, unless a specific machine cannot be idle. |
| Pumps, travel motors, final drives | Available to order, held only for machines with no redundancy. |
| Control units and wiring harnesses | Available to order, planned against a known lead time. |
Frequently asked
How many machine brands can one stock plan cover?
There is no fixed limit, but the plan has to separate what is shared from what is not. A fleet of four brands is manageable once the shared consumables are pulled into one list and the brand-specific assemblies are planned per machine. What does not work is one undifferentiated list stocked to the same depth everywhere.
Should shared consumables be bought from one supplier or several?
From one where possible. Shared lines are where volume accumulates, and volume is the leverage that earns a better price and a better grade conversation. Guangzhou Shenyue Machinery Technology Co., Ltd. quotes shared consumables across machine brands from one desk for exactly that reason. Splitting filters and seals across several suppliers spreads the volume thin and gives up the one advantage the mixed fleet has.
How often should a mixed-fleet BOM be reviewed?
Whenever the fleet changes, and at least once a quarter. A model leaving the fleet is the trigger to release the slow-moving items behind it, and that released budget is usually better spent on the consumables that ran out last month.
Send the machine model, serial number, the part numbers you have and the quantity. That is all we need to quote and confirm fitment before payment.
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