Place of Origin:
China
Brand Name:
Cum-mins
Model Number:
4063844
This in-line diesel fuel injection pump assembly serves the 5.9 litre six-cylinder engine family badged as 6BT, 6BTA and 6BTAA, and is catalogued by the machine maker as 6738-71-1520 for Hyundai R220LC-9S and related excavators. The same physical pump carries four separate figure languages — engine side 4063844, pump maker 101062-9270, machine side 6738-71-1520, and a distributor reference — none of which indexes the others. The calibration twin 4063845 is identified here so it can be avoided before ordering rather than after.
| Product Name | In-line diesel fuel injection pump assembly |
|---|---|
| Engine Side Figure | 4063844 |
| Pump Maker Figure | 101062-9270, with 101609-3750 and 101609-3760 quoted alongside it |
| Machine Side Figure | 6738-71-1520 |
| Calibration Twin | 4063845 — a different fuel curve in the same casting |
| Engine Family | 5.9 litre six cylinder, turbocharged, charge cooled on most builds |
| Engine Badges | 6BT, 6BTA, 6BTAA, and the same block badged as a captive brand six |
| Machines | 220-class crawler excavators and wheel loaders of the same generation |
| Governor | Mechanical, with a boost compensator fed from the inlet manifold |
| Drive | Gear driven from the camshaft side, timed on assembly |
| Condition Offered | New and rebuilt, each under its own figure |
| Supplied With | Coupling plate, mounting bolts and a test sheet |
| One Block, Three Badges | A captive brand badges this engine as its own 5.9, the engine maker stamps it as a B series, and the machine maker catalogues it as a six cylinder of its own series. All three accept this pump. |
|---|---|
| Four Figure Languages | Engine figure, pump maker figure, machine figure and a distributor figure all describe the same casting, and none of the four indexes the others. |
| Calibration Twin | The twin figure differs by one digit and by fuel delivery, so it will bolt on, run, and smoke under load because the curve belongs to a different rating. |
| Tail Digit Split | Two pump maker figures ending 3750 and 3760 are both advertised against this engine number, and listings disagree about which pairs with which engine figure. |
| Plate Decides, Not Model | The machine designation is sold in two builds, one mechanical and one common rail, and only the mechanical build carries this pump. |
| Common Rail Lookalike | The later build of the same model uses a radial piston high pressure pump with an electronic metering unit, which shares no flange, no drive and no pipework with this assembly. |
| Machine Lists Too Wide | Some titles attach this pump to machines running a larger six, which cannot take a 5.9 pump whatever the listing says. |
| Genuine Two Ways | Factory new and factory rebuilt carry different suffixes on the engine figure, so a genuine quotation has to state which one is being priced. |
| Caution — Static Timing | The pump is timed to the engine on fitting, and a pump dropped in without the timing procedure starts hard and smokes white at idle. |
| Caution — Compensator Hose | The boost pipe from the inlet manifold must be reconnected, or the pump fuels as if the turbo were absent and the machine loses power uphill. |
| Caution — Contaminated Fuel | Element and delivery valve wear on these pumps is usually the result of water or grit, so a replacement without a tank clean repeats the failure. |
| Related Components | Coupling, feed pump, fuel filter head, shut off solenoid, delivery valve, injectors, spill pipe. |
1. Is this the pump for a common rail machine of the same model?
No, the common rail build uses a different pump family entirely, so check the engine plate first.
2. Two figures ending 3750 and 3760 are both offered — which is right?
The pump body plate settles it, because listings contradict each other on the pairing.
3. Can the calibration twin be used instead?
It fits but delivers a different fuel curve, which shows up as smoke and poor load response.
4. How is genuine new told apart from genuine rebuilt?
By the suffix on the engine figure, which is why quotations must carry the suffix.
5. Does the pump come timed?
It comes assembled, and timing is set on the engine.
6. What causes a second failure after replacement?
Dirt or water left in the tank and lines.
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