Place of Origin:
China
Brand Name:
Cum-mins
Model Number:
4951501
This is a pressure time (PT) fuel pump, not an in-line pump with one element per cylinder — a distinction that determines whether the machine can run at all. The same casting is sold under a dozen part figures across four engine sizes and three governor builds, so the reference tables below separate those variants rather than grouping them.
| Product Name | PT fuel injection pump assembly |
|---|---|
| Current Figure | 4951501 |
| Base Figures | 3019487, with 3019488 and 560659 quoted alongside |
| Related Figures | 3262033, 3045281, 3262111, 3080571, 4009414, 3070123, 3075524 |
| Sister Assemblies | 4951495, 4951499, 4951496, 4951502 |
| Engine | NT855 and NTA855 six cylinder, fourteen litre class, and the NH220 relative |
| Machines | SD22, SD22S, SD22F and SD32 bulldozers, ZL50F wheel loader, and genset builds |
| System Type | Pressure time, metering done at the injector cup, not at the pump |
| Governor | Mechanical, variable speed for marine and generator builds |
| Drive | Gear driven from the accessory train, flange mounted |
| Condition Offered | New, and rebuilt with a calibration sheet |
| Packing | Port caps, throttle shaft braced, foam blocked crate |
| Not An Element Pump | There are no six plungers inside this body, because metering happens in the injector cup at the top of each cylinder and the pump only delivers fuel at controlled pressure for a controlled time. |
|---|---|
| Base Number Still Used | The older base figure is what many workshops write on the job card, and the newer figure is what the factory ships, so both must appear in any quotation. |
| Four Assemblies, One Shape | Assembly figures differing in the final digit serve different engine sizes in the same family and cannot be told apart from the outside. |
| Governor Build | The marine and generator version carries a variable speed governor, while the earthmoving version carries a different droop, and swapping the two leaves a dozer with no torque rise. |
| Air Fuel Control | Turbocharged builds use the control that limits fuel until boost arrives, and a pump without it fitted will smoke heavily at low load. |
| Engine Sizes Cross Listed | Listings place this figure against the fourteen litre six, the older two hundred and twenty horsepower engine and the larger mining engines, which is one reason wrong pumps are shipped. |
| Caution — Throttle Shaft | The shaft is set on a bench and sealed, so it must never be moved to make an engine idle better; that adjustment cannot be recovered in the field. |
| Caution — Gear Timing | The drive gear is keyed to the pump and one tooth out will produce a crank but no start, which is often misread as a faulty pump. |
| Caution — Inlet Restriction | The internal gear pump needs a clean supply, and a collapsed hose or blocked strainer will destroy it within minutes of running. |
| Caution — Return Check | A restricted return line raises internal pressure and makes the governor hunt, so the return is checked before the pump is condemned. |
| Caution — Shutoff Valve | An engine that keeps running after the key is released usually has a stuck shutoff plunger, not worn internals. |
| Related Components | Injectors, fuel filter, strainer, shutoff solenoid, throttle linkage, drive gear. |
None — it is a pressure time pump and the injectors do the metering.
No, the governor droop is different and the machine will not pull.
Both, because workshops and factories use different ones.
The drive gear is one tooth out or the shutoff is not energised.
A restricted inlet, which starves the internal gear pump.
Only within the sealed range; the shaft setting itself is a bench job.
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