10400874005 Mechanical Fuel Injection Pump for F4L912 Diesel

The application we stand behind is the BeiNei-Deutz F4L912: a four cylinder 3.77 litre air-cooled diesel with a 100 mm bore and a 120 mm stroke, naturally aspirated and mechanically injected, built in China under Deutz technology, together with the -G variant of that same series. The engine family turns up in wheel loaders, skid steers, small crawlers, bale presses, small combines, trailer-mounted compressors, irrigation pumps and generator sets. Two things carry that application and they are the ones the published data actually supports: the four cylinder air-cooled 3.77 litre engine family with mechanical direct injection, and the plates on the pump itself. That is the diesel injection pump this engine was built with, and an order that starts from the pump coming off is the one that arrives correct.

Why the plates matter more than the number. The published type code recorded against this pump is not unique to it. CPES4A80D410RS2523 appears in trade tables against several part numbers covering more than one variant in this four cylinder family, which means a buyer who orders on that code alone can be sent a neighbouring build. That is not a theoretical risk on a mechanical injection pump, because variants in this family differ in the parts that are hardest to change: the calibration of the rack and the pump elements, and the fit of the governor. The plates are what settle it, and they stay readable long after the paperwork and the sticker have gone.

Two more identifiers worth having. If the machine is still with the customer, the serial stamped on the engine block settles the variant faster than any chart. Where the pump is already off, a photograph of the maker data plate, a photograph of the green plate on the end face, and a photograph of the engine code plate settle it instead. Any one of those alongside the delivery union count is enough for us to confirm in writing; all of them together is what stops a shared-type-code mix-up reaching your workshop.

What this page is not claiming. We are not saying that a neighbouring part number in the same type-code family fits your engine, that the type code identifies this unit, that a component number for the pumping elements or the delivery valves is settled, that the published application covers a machine without a plate check, or that a pump from another engine family substitutes. 10400874005 describes one build, and the plates are what identify it. Anything beyond those lines is better answered from your own parts data, and we would rather answer it with you than assert it here.

Start with what this engine does not have. There is no high pressure fuel rail on a F4L912 and there is no high pressure pipe running back to the tank, because the injection system is mechanical and has been since the type was introduced. What happens instead is direct and easy to follow: the camshaft turns, a lobe in each cylinder’s pumping element pushes a plunger down its machined bore, and that mechanical action forces diesel straight to that cylinder’s injector at whatever pressure the element makes. One pumping element per cylinder, four cylinders, four delivery lines. The mechanical in-line fuel injection pump is the assembly that drives all four of those elements from one camshaft, and it is the part this page is about.

Speed control on an engine like this is mechanical too, and it is worth understanding because it explains the linkage arm bolted to the outside of this pump. A mechanical centrifugal governor uses the pump’s own rotation as its input: flyweights push outward as the shaft speeds up, and that movement slides a block that turns the rack, which then rotates each pumping element to change how much fuel that cylinder takes. Load comes back the other way through a spring on the external arm. There is no electronic control unit involved, no solenoid, and nothing to scan. That is why this pump has a steel spring linkage arm and a pivot boss on the outside, and why a common rail pump of the same general era has neither.

The three assemblies this pump is regularly confused with are worth separating on physical features rather than on descriptions. A common rail high pressure pump is a single unit that builds pressure in one common volume and feeds every injector from it; it has an inlet from the tank, a high pressure outlet, and usually a metering valve or a control unit on it. A unit pump sits in the cylinder head, one per cylinder, with the injector beside it. A supply or lift pump is a small electric or mechanical pump in the tank. The engine this pump belongs to is an air-cooled four cylinder of the older generation throughout, and that is why the right part is decided by counting delivery unions rather than by a modern reference lookup. This one has four delivery line unions along the top of the body, a camshaft drive flange, a governor linkage and a hand primer, and no rail. Those features are checkable in a photograph taken before anything is unbolted.

The second number trap on this page is the type code, and it is the one that catches experienced buyers. CPES4A80D410RS2523 reads like a part number and behaves like a family designation, because published trade tables assign it to several separate numbers across more than one engine variant in this four cylinder family. A code that spans several part numbers cannot identify one of them, and a mechanical injection pump is not interchangeable across variants on the strength of a shared code, because the rack travel and the element calibration are what set the fuel delivery. So we do not list it as a reference number for this unit, and we would rather explain that here than let a buyer order on it and find out at the bench.

The first number trap is much simpler and just as costly. Some listings show 10 400 874 005 for this item, and that is the same set of digits as 10400874005 written the way part numbers are conventionally grouped into blocks of three. One number, two ways of writing it. It is not a second number, and it is not a number belonging to any other pump manufacturer, and nothing on this page should be read as a claim about any other maker. If your paperwork carries the spaced form, treat it as this part number and confirm on the plate.

Where our supply differs is what arrives rather than how the part works. Original equipment supply comes through the manufacturer’s own channels, and a buyer whose paperwork requires a factory boxed part does need to go there. What we supply is a mechanical fuel injection pump replacement — a new compatible unit for the same job, sold under the Vidishi Auto brand, at a two-piece minimum with no core return. That last point matters on a mechanical job: nothing has to come back, there is no exchange loop to manage, and the removed pump stays with you for the warranty file.

One thing we do not do is dress that up. The 10400874005 pump we ship is ours, not a manufacturer’s and not an engine maker’s. The part number, the reference number and the engine designation appear on this page so you can match the pump you are replacing; they are references for fitment, not a claim about who made the part. The stamped characters on the maker plates visible in the photography are recorded as markings carried by the goods and are not transcribed as part numbers, because they cannot be read with enough certainty to identify a build. The buying guides hold the general method for confirming any diesel part from the unit itself, and the glossary explains the terminology if any of the names above are unfamiliar.

How we label data. Confirmed means a value read directly from the goods we handle, including the delivery union count, the drive end, the governor linkage and the maker plates visible in the photography. Reference means a part number, an engine designation or a cross reference quoted so your paperwork can be matched, and carrying no claim about origin. Not published means the field is left blank on purpose — a delivery figure, a pressure figure or a component number that we cannot source would be worse than an empty cell, because it would end up in somebody’s parts order or somebody’s engine settings.

What is in the box. One complete mechanical in-line fuel injection pump: the cast body with its four internal pumping elements and delivery valves behind the cover, the mechanical governor with its external steel spring linkage arm, the hand primer with its white plastic cover at the drive end, the camshaft drive flange with its hex boss and bolted round end cover, the delivery line unions along the top rail with their green caps, and the maker plates as photographed. New sealing washers and a fresh filter element are required at fitting and neither is asserted as included for this line. Nothing on this page is sold loose from the pump, and the internal service components keep their own listings for buyers who want a rebuild rather than a replacement.

Read the table from the top, because the order matters a great deal here. 10400874005 is the supplier part number and it is the only number on this page that identifies this unit together with its plates. The 800464001 row is a published reference number recorded against this pump; it comes from a single published source, so we mark it as a reference rather than as a confirmed interchange, and it is useful for matching paperwork rather than for authorising a purchase you have not verified. Used as a 10400874005 cross reference map, the table is a boundary as much as a bridge — a parts system will match one form of a number and not the other, which is worth knowing before a search box tells you a part does not exist.

The 10 400 874 005 row exists because it costs people money. Those are the same digits as 10400874005, arranged in blocks of three the way part numbers are conventionally written, and some listings show the spaced form while others show the unspaced one. It is one number written two ways. It is not a second part, it is not an alternative supply, and it is not a number belonging to any other pump manufacturer — if a supplier quotes it to you as somebody else’s number, that is a sales approach rather than a cross reference, and the honest answer is that it identifies the same unit we ship.

The CPES4A80D410RS2523 row is the one to read twice. Published trade tables assign that code to several part numbers across more than one engine variant in this four cylinder family, which makes it a family code and not an identifier, and it is not printed here as a reference number for this unit. We are aware that omitting a number some buyers search for looks like a gap; it is not, and the reasoning is on the page. A code that spans several of them cannot tell you which one you are buying, and on a mechanical injection pump the differences between variants sit in the rack travel and the pump element calibration, which are precisely the things you cannot change afterwards. Order against the number on the plate, and we will confirm what you have.

The last two rows are the engine side of the mapping, and they are reference rows in the true sense: F4L912 is the published application for this number, and the -G designation is published for a variant of the same air-cooled four-cylinder series. Neither is a claim about a specific machine, which is why the fitment section ends on your engine code rather than on either of them. What the table deliberately does not do is extend itself: it does not say a neighbouring part number in the same type-code family fits your engine, that a component number for the pumping elements or the delivery valves is settled, or that a pump from another engine family substitutes. Those are exactly the assumptions that turn a cheap order into an expensive week of machine downtime. Our comparison charts set out the number families we can evidence, and the buying guides cover the general method for confirming any diesel part from the unit itself.

The practical difference shows up on the first cold start after fitting. A mechanical injection system has nothing to bleed and nothing to prime electrically, so once the pump is on, the hand primer does the work and the engine either fires or it does not. What a tired pump gives you instead is a machine that runs, and runs badly, for weeks — uneven idle, smoke under load, consumption creeping up — while each part gets replaced in turn. Keeping a matched spare — correct plates, four delivery unions, linkage arm present — turns that into an afternoon. That is the case for holding one of these on the shelf before anything has failed, and it is why the minimum order is set where two covers a workshop without anyone holding stock nobody ordered.

• An idle that hunts and will not settle — On a mechanical system the governor is the only thing holding speed, and a worn sliding block or a tired spring lets the rack drift. The engine then cannot hold a steady fuel delivery at idle, and it hunts or shakes in a way no mounting fault explains.
• Power that is fine at idle and goes flat under load — When the operator asks for load the rack has to move further, and that is exactly what a worn pump does worst. The engine feels acceptable standing still and flat the moment it is worked, which is what makes it easy to misread as a governor adjustment or an air problem.
• Smoke under load — Fuel delivered at the wrong point in the cycle, or delivered unevenly between cylinders, will not atomise the way it should and it leaves the stack as smoke. On this engine that points at the pumping elements or the delivery valves rather than only at the injectors.
• Rising fuel consumption — Fuel that the pump is not delivering to the cylinders goes back, and the tank empties sooner than the hour meter suggests. On a mechanical pump the cheapest way to see this is comparing consumption against the hours on the meter over a full tank, not watching a gauge.
• Hard starting that gets worse warm — A mechanical pump that has dragged down will not make the delivery it needs for a start once the engine is warm and the clearances are tighter, so a start that is brisk cold and long hot is a pattern worth reading properly rather than blaming on the starters.
• All four cylinders affected at once — The pattern that points at the pump rather than at an injector. One mechanical pump and one rack feed all four cylinders, so a pump fault takes the whole engine down together, while a single worn injector leaves the other three steady. That distinction does more diagnostic work than any code name.
• Uneven running that changes with load and temperature — A fault that moves around as the engine warms and works is more consistent with a mechanical pump than with a fixed injector or a fixed filter, because clearances and spring behaviour both change with temperature and load.
• A rough engine that no filter or injector work cures — Filters and injectors are the usual suspects on a diesel, so a pump fault is often bought as a filter first. If new filters and good injectors leave the running exactly where it was, the pump is the next thing to look at, and the linkage arm and the delivery valves are where to look on it.

The pattern worth holding on to is the one that affects every cylinder together. A single worn injector shows up on one cylinder and leaves the engine steady on the other three. A tired mechanical fuel injection pump takes the whole engine down together, because one rack feeds all four cylinders. Loss of power under load and uneven running that moves with temperature both belong on the same list, and a mechanical delivery can be compared cylinder by cylinder in a way a rail reading never can be on this engine. That single distinction does more diagnostic work than any code name, and on this engine there are no pressure readings to take, so the cylinder pattern is the measurement. The fault code guide covers how to read data where a code exists at all, and our maintenance guide covers the filter and water separator intervals that keep an injection system healthy.

• Step 1. Photograph the plates before anything is unbolted
  Take a clear shot of the maker data plate on the pump flank, the green plate on the end face, and the engine code plate. On this pump the plates are the identification, and they stay readable long after the paperwork and the stickers have gone. Photographing first also settles the dispute-free conversation later if the fitment is ever questioned.
• Step 2. Mark the linkage arm position and the drive position
  Before the pump comes off, mark where the steel linkage arm sits relative to the housing and where the drive end sits against the engine. A mechanical in-line pump has to go back on the same position, and the marks are the only thing that guarantees the governor linkage reconnects correctly.
• Step 3. Flush the system if the old unit failed internally
  If metal is present in the fuel, replacing only the pump destroys the new one just as fast. Drain the tank, the delivery lines and the cylinder head side, fit new filters, and only then fit the new unit. This step is the single biggest cause of a second failure and it is the one that gets skipped on a job under time pressure.
• Step 4. Clean the mounting face and the spill port before opening anything
  Wash around the pump, blow the sealing face down, and only then release the bolts. Grit that falls onto that face ends up between the two surfaces, and the new pump will weep from its first minute. On a mechanical engine the sealing faces are flat and unforgiving, so this is worth doing properly rather than quickly.
• Step 5. Unbolt evenly and support the housing
  Work the bolts in sequence rather than freeing one corner at a time. The housing has to lift straight off the engine and not at an angle, and that end of the pump must never be levered against the camshaft or against the gear.
• Step 6. Inspect the drive end and the camshaft drive
  Check the hex drive boss, the flange register and the surrounding material for wear, burrs and thread damage. A drive that has been turning against a worn coupling will damage the new pump within hours of running, and it is the most expensive thing to discover after fitting.
• Step 7. Fit new sealing washers and a fresh filter element
  A fresh seal goes under the refitted pump, and the filter element is renewed rather than reused. Reused seals and a reused element are the most common causes of both a weep and an early return of the same fault, and both are cheap to prevent.
• Step 8. Refit square, reconnect the linkage and prime before the engine runs
  Drop the pump into the marked position, bring the mount up evenly, torque to the figure for your engine, and reconnect the linkage arm to the same position you marked. The figure belongs to the engine and not to the part, and we do not publish it for this number. Then fill and prime through the hand primer until the system shows no air, and confirm the engine runs evenly before the machine goes back to work.

Two notes on what we deliberately do not print. We do not publish the tightening figure for the mount, the injection pressure figure, or the pump element delivery, because all three belong to the engine application rather than to the part, and a figure copied from a product page into a workshop manual is how a good pump gets damaged on a correct fit. Take them from the engine manual for the machine in front of you. And we do not publish a diesel fuel injection torque figure as a shortcut, because the mount, the delivery lines and the cylinder head connection each have their own value and they are not interchangeable. The installation guide covers the surrounding routine, and the glossary defines the terms if any of the above are new to you.

Every 10400874005 pump is covered by a 12-month warranty against manufacturing defects. That covers a unit that arrives out of specification or fails early because of how it was made. It does not cover damage from contaminated fuel, from water in the system, from a filter changed too late, from incorrect fitting, from a drive boss torqued beyond its figure, from a linkage arm reconnected in the wrong position, or from a separate fault elsewhere in the fuel circuit. It is a supplier warranty from Vidishi Auto — we are not a dealer for any engine maker and not a dealer for any pump manufacturer, so no cover from any of them travels with this part.

The one condition we ask about every time is whether the system was flushed when the old unit came out, because that is the single most common reason a replacement injection pump fails early and the single easiest thing to get wrong on a job where somebody is under time pressure. Tell us what was done and we can tell you quickly whether a claim is likely to stand. If you would rather settle that question before you order, the contact page is the fastest route to a written answer.

The minimum order quantity is 2 pieces, and the reasoning is worth stating rather than leaving you to work out. Demand for a mechanical in-line pump of this type comes in workshop batches rather than one at a time, because a failure takes a machine off the road and the repair is done once, properly. Two pieces covers a workshop and lets one pump sit on the shelf as the known-good unit for comparison before anything else is committed. From there the line scales normally — a fleet running several engines will take a set per machine, and a distributor will take them alongside the rest of a fuel system order.

What we do not do on this line is pretend the part is something it is not. The unit we ship is a new compatible replacement sold under the Vidishi Auto brand. It is not a genuine original equipment product, not a manufacturer-branded product and not a factory boxed original. That matters commercially as well as legally: if your incoming goods inspection needs a specific brand on the paperwork, this is not that product, and we would rather tell you now than have a delivery rejected. The help centre covers ordering and documentation questions.

The package size and gross weight in that table are a packing estimate, and we label it that way rather than quietly presenting it as a specification. No source we can stand behind publishes a packaged figure for this number, so we give you a figure we can pack and weigh against rather than a manufacturer specification we cannot evidence. If your freight is calculated on volumetric weight rather than actual weight, tell us the destination and we will confirm the chargeable weight against the carton we actually use. The shipping page sets out the full documentation and delivery terms, and the order tracking page is where to follow a shipment once it has left.

On the protective side, three areas get watched on this pump. The drive end and its hex boss, because a boss knocked out of shape will not seat on the camshaft and will damage the new pump within hours. The steel linkage arm, because a bent arm will not reconnect to the same position and the governor will be out. And the maker plates, because those are where identification lives on this part and a scratched plate is an argument you will have at the worst possible moment. All three are packed protected on every unit, and all three are worth checking on arrival before the box goes into stores.

A mechanical injection pump is a small number of large, precisely machined parts, so this line is checked at unit level rather than by sample. Every batch passes an incoming check on the maker plates, a count of the delivery line unions along the top rail, an inspection of the drive end and its hex boss, a confirm that the governor linkage arm and its spring are present and undamaged, a check that the hand primer is fitted and capped, a confirm that the delivery valve block and the flow paths are free of obstruction, and a packed-weight confirmation against the documented figure. The supplier shows a system certification badge on the product photography, which we record as a supplier statement rather than as a certificate we issue.

Rather than publish reviews we cannot verify, we tell you what we will actually put in writing: a written fitment confirmation against the plates and engine code you send us, a written quote against your quantity and destination, and a warranty position on any claim that follows. If you need a supplier who will sign a specific inspection or conformance document with the order, ask before you buy rather than after, because the answer depends on what the document is. The help centre covers the documentation we can provide, and the partner programme page is the route for a standing arrangement that needs more than a one-off order.

Support is not an add-on on this line — it is how most of these orders get placed correctly. It costs nothing before you buy: send a photograph of the maker data plate on the unit you are removing, a photograph of the plate on your engine, and the delivery union count, and we check the whole set against what we supply before quoting. That last item is the one people skip, and on this pump it is the one that matters most, because the type code published against this number is shared across several part numbers covering more than one engine variant. Two minutes with the pump in front of you is cheaper than a pump that arrives and does not settle the fault.

Two things we will not do, whatever the order size. We will not quote a fitment we cannot evidence, and we will not ship a pump matched on a type code when the plates on the old unit are available. If that costs us an order, it is still the right call: a mechanical injection pump that arrives as a neighbouring variant costs a workshop a second removal, and that is the failure we exist to prevent. If anything on this page is unclear, the FAQ page collects the questions buyers raise most, the contact page lists every route to us, and a written answer is always better than a guess on a workshop schedule.