Place of Origin:
China
Brand Name:
CAT
Model Number:
3408
Four catalogue figures sit under one engine name, and they are not four versions of one article: they are one pump, two sub-assemblies and an individual plunger pair. The gap between them reaches forty times in price, which is why the level has to be agreed before the number is written on an order.
| Product Name | Fuel injection pump, sleeve metering type |
|---|---|
| Assembly Figure | 7W-1983, quoted against engine blocks and track tractors alike |
| Alternative Assemblies | 4W-7058 and 4W-6037, differing by governor and coupling details |
| Element Figure | 7W-0561, sold singly and in matched sets |
| Cylinder Count | Eight on this engine, twelve on the larger relative |
| Governor | Hydra mechanical, driven from the pump camshaft |
| Drive | Gear driven, timed to the camshaft, coupling keyed |
| Machine Programmes | Track tractors, scrapers, generator sets, marine and industrial |
| Calibration | Bench set, with delivery recorded against the unit serial |
| Packing | Timing pinned, ports plugged, crate braced |
| Four Levels, Not Four Versions | One figure buys the whole governor body, another buys a sub-assembly still missing its coupling, and a third buys a single plunger pair that a fitter seats by hand. |
|---|---|
| Forty Times In Price | The same engine name appears on line items from the price of a handful of small parts to the price of a used car, and the number alone will not tell you which rung you are on. |
| Eight Against Twelve | The neighbouring engine shares the pump family and adds four more outlets, so a body bought for the smaller one is short by four elements and cannot be made up. |
| A Distant Cousin | The six cylinder pump offered elsewhere on the market shares the mounting pattern and the governor layout but runs a shorter camshaft, which is why it is so often quoted by mistake. |
| Sleeve Metering Explained | Delivery is set by how far a sleeve travels over a plunger, so wear shows up as a slow drift in fuelling rather than as a sudden failure. |
| Reman Versus New | A rebuilt body carries a core charge and a warranty tied to the fitter's cleanliness, while a new one carries neither, and both are quoted under the same engine name. |
| Caution — One Tooth Out | A coupling set one tooth off starts and idles, then smokes and loses power under load, and the owner usually blames the new pump. |
| Caution — Water In The Gallery | Clearances inside this pump are measured in microns, and a single tank of wet fuel will seize a plunger that no amount of flushing will free. |
| Caution — Rack Travel | Chasing a rough idle by turning the rack screw moves the whole delivery curve, and the engine will then fail an emission check it previously passed. |
| Related Components | Plunger pairs, delivery valves, governor spring kit, drive coupling, gasket set, fuel filter head, hand primer. |
The assembly figure, and the quotation should say plainly whether governor and coupling are included.
Because one is an element and the other is a finished body with a governor.
No, it carries four more outlets and a longer camshaft.
Only if the coupling is pinned and marked before removal.
As falling power and rising smoke over months, not as a sudden stop.
Yes, provided the core is sound and the fuel system is flushed first.
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