CRSV425750A0C315R RSV Governor 10 420 235 215 for Inline Fuel Pump

The application we stand behind is a mechanical inline injection pump, driven through a splined hub and connected to the accelerator side through the pump control rod and the governor control lever, with a flexible joint in between. That is the whole of the claim, and it is a mechanism claim rather than a model list, because a model list cannot tell you whether your linkage and your hub will physically go on. We deliberately do not extend it to an engine, a vehicle, a cylinder count, an emission stage or a year range: nothing we can cite publishes those for this number, and the published records that carry a CRSV425 designation describe complete pumps built on a different suffix system, which tells you about those pumps and not about a governor. The diesel fuel injection system this belongs to is the mechanical kind, and an order that starts from the pump coming off is the one that arrives correct.

Three more identifiers worth having. If the machine is still with the customer, the serial number on the machine plate settles the build faster than any chart, and the engine code plate settles which engine variant it is. Where the governor is already off the pump, a photograph of the identification plate and a photograph of the old governor’s mounting face settle it instead. Any one of those alongside the plate is enough for us to confirm in writing; all of them together is what stops an interface mismatch reaching your workshop.

Why the plate matters more than the number series. The 10-420 235 2xx numbers are published as mechanical and centrifugal governor numbers, which is genuinely useful: it tells you at a glance that you are holding a speed-control mechanism and not a pump. What it cannot tell you is which governor in the range this is, and it certainly cannot tell you which engine it was calibrated for. The plate settles the first, and only the pump behind it settles the second. Match those, confirm the hub and the linkage, then order. A mechanical centrifugal governor bought that way arrives right the first time, which is the whole point of the four steps above.

What this page is not claiming. We are not saying that a neighbouring number in the same series fits your pump, that a spring or a seal from the wider family is correct for this build, that the governed speed range is a fixed figure, or that a governor from a different design substitutes. Where the plate suffix and our listing reference disagree, we print neither complete form rather than make you reconcile two strings, and the full designation is confirmed against the plate on the unit in front of you. 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 the division of labour, because everything else follows from it. A fuel injection pump makes pressure. It has a pumping element, a cam acting on it, delivery valves, and it forces fuel into the lines at whatever pressure the engine needs. A mechanical fuel pump governor has none of that. It is a speed-control mechanism, it has no pumping element at all, and it decides continuously how much of the fuel the pump is allowed to deliver as load and speed change. One makes the pressure, the other meters the amount. A machine with a fault in the second will run out of fuel and a machine with a fault in the first will lose pressure, and the two are diagnosed in completely different places.

How the governor does it is centrifugal force, and the mechanism is worth understanding because it explains every symptom on this page. The governor is spigoted onto the rear of the injection pump and driven by the pump’s own camshaft, so it turns at a fixed relationship to engine speed. Inside it, two flyweights sit on a hub and swing outward as that hub turns faster. Their movement is taken up by a system of levers and converted into a push on a sliding bolt that bears against a tensioning lever, and that lever is drawn the other way by the governor spring, which sits outside the flyweights. The control lever sets how much that spring is tensioned, and that setting is what you experience as the top speed. When engine speed rises above the setting, the flyweights move out, the linkage pulls the pump control rod back, and fuel delivery falls. When speed drops, the spring pushes the rod forward and delivery rises. The pump then produces less or more pressure in response, and the engine settles at the speed the control lever asked for.

That arrangement is what the RSV designation names, and knowing it is genuinely useful when you are sorting parts rather than reading a sales line. In a governor of this type the centrifugal force of the two flyweights is transmitted through a lever system acting on a governor spring located outside the flyweights themselves, which is what separates it from the other common mechanical design, where the springs are built into the flyweights. The practical consequence is in the service parts: on an RSV the spring, the sliding bolt, the tensioning lever and the bell crank are all individually replaceable, and the spring is the item most often changed. The number on the plate, 10-420 235 215, sits in a number series published for mechanical and centrifugal governors, which is the second independent confirmation that you are holding a speed-control mechanism.

The linkage is the third thing to understand, because it is where most mismatches happen. The published mechanical arrangement connects the pump control rod to the governor linkage through a flexible joint, and the accelerator side acts on the governor control lever. In practice that means three interfaces have to agree before the part will work: the splined hub bore that sits on the pump camshaft, the stepped spigot above it, and the external linkage lever with its serrated washer and stop tab. All three are visible on the outside of the unit in the photography on this page, which is unusual and useful — you can check the interface before the part is ever offered up to the pump. A governor that looks right but whose lever travel is different will fit the hub and still fight the control rod, and that is a fault worth catching at the bench rather than on the machine.

Where the governor stops and the rest of the fuel system begins is the fourth thing, and it is the one this page is most careful about. What arrives here is the governor assembly: housing, hub, flyweight and spring mechanism, adjusting stud, mounting bracket and linkage lever. It does not include the pump body, the plunger or pumping element, the delivery valve, the feed pump, the injectors or the drive gear. A buyer who needs a fuel system that runs is buying several parts, and the governor is the part that decides whether the engine holds its speed once the rest of the system is working. The glossary defines the terms used above if any of them are new, and our fault code guide covers how to read a code before you replace anything.

Where our supply differs is what arrives rather than how the mechanism 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 governor replacement — a new compatible unit for the same job, sold under the Vidishi Auto brand, carrying the same part number on its plate, at a single-piece minimum with no core return. That last point matters more here than on a big pump: the old governor is small, it is easy to lose, and keeping it costs nothing while a claim is open. The maker mark visible on the plate in our photography is recorded on this page as a fact about the plate, not as the brand of the goods in the box, because those are different things and a purchase order that needs a particular brand on the paperwork should be settled before the order rather than after the delivery.

How we label data. Confirmed means a value read directly from the goods we handle, including the numbers on the identification plate and the hub, linkage and mounting features visible in the photography. Reference means a number series, a type designation or a cross reference quoted so your paperwork can be matched, and carrying no claim about origin or fitment. The maker mark physically present on the identification plate is recorded on exactly that basis: a reference only fact about the plate, useful for your incoming inspection, and not the brand of the goods supplied. What arrives is a new Vidishi Auto compatible replacement, not a BYC-branded product. Not published means the field is left blank on purpose — a speed figure, a component number or an engine list 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 injection pump governor assembly: the cast housing with the flyweight and spring mechanism inside it, the splined hub and stepped spigot that take the drive from the pump camshaft, the external linkage lever on its pivoted plate with the stop tab, the threaded adjusting stud with its two knurled lock nuts, the mounting bracket and the identification plate, all as photographed. It is not supplied with the pump, the feed pump, the injectors or the drive gear, and it is not supplied with the internal service items, which keep their own catalogue entries against the wider governor family. New seals and a fresh cover gasket are required at fitting and neither is asserted as included for this line.

Read the table from the top, because the order matters. CRSV425750A0C315R is our supplier listing number and it is the weakest identifier on the page: it is the number this item is published under, and it tells you nothing about the specification of the unit you will be sent. The row that identifies the unit is 10-420 235 215, printed on the top line of its own identification plate, and that is the number you will find on the metal in your hand. Used as a CRSV425750A0C315R 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 the part does not exist.

The second row of the mapping is the one that catches people, and it is worth reading twice. 10 420 235 215 and 10420235215 are the same part number as the plate, written the two ways that catalogues and packing lists habitually use it. If a supplier has quoted you the number without separators, they have quoted you this part. If they have quoted you our listing number instead and told you it is the manufacturer number, they have not — and on a governor, where the plate number and the build are what decide the fitment, that difference is the whole ballgame.

The RSV row is there for identification the way a family name is on any catalogue entry, and it is worth reading with care. RSV is a type designation: it names a mechanism class, in this case a mechanical governor in which the flyweight force is transmitted through levers to a governor spring located outside the flyweights. It tells a parts clerk what sort of unit to look for on the shelf and it tells you which service parts are relevant. It is a reference only observation: it is not a statement that any particular manufacturer made the unit in our box, and it is not a claim about origin. The 10-420 235 xxx number series is the same kind of observation: published as mechanical and centrifugal governor numbers, useful for confirming you are holding a speed-control mechanism, silent about which engine it fits.

What the table deliberately does not do is extend itself. It does not say that a neighbouring number in the same series fits your pump, that a spring or a seal from the wider family is correct for this build, or that a governor of a different design substitutes. The full maker designation on the plate is not reproduced here either, because its suffix does not agree with our listing reference and we will not print two strings and ask you to decide which is the model. Those are exactly the assumptions that turn a cheap order into an expensive week of machine downtime, and we would rather leave the cell empty than fill it with a guess. 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 road test rather than on the bench. When an engine will not hold the speed it is asked for, the vehicle either keeps running with a speed nobody set or it comes off the job until the linkage is sorted out. Keeping a matched spare — correct plate, correct hub, linkage lever and adjusting stud present — turns a machine that is off the road into a same-day swap. That is the case for holding one of these before anything has failed, and it is why a single-piece minimum is the sensible purchase here: one governor is one job, and the shelf spare is the one that earns its keep.

• An idle speed that hunts — The control rod is being moved by a mechanism that is not holding a steady position, so the engine hunts at idle and will not settle. On a governor this is the classic first symptom, and it is worth checking the linkage and the stop levers before anything else.
• Speed that will not come down — An engine that will not come off its maximum under load is telling you the maximum speed stop is not doing its job, or that the linkage is not reaching it. The fuel system can be entirely healthy and the engine still will not slow down.
• Speed that drifts with heat — A governor that holds speed cold and wanders once the machine is warm points at the governor supply or at a linkage that has loosened in service, rather than at the engine or the injectors.
• An engine that will not shut down — On a pump with an electric stop solenoid, an engine that keeps running after the stop is commanded is a governor symptom until proven otherwise: the stop lever, the stop spring or the linkage is the place to look.
• An idle that will not fall — The idle stop screw or lever is not being reached, or the stop is set beyond where the linkage can pull it. Again a governor symptom, and again one that is quick to confirm and easy to misattribute to the fuel system.
• A speed that will not hold under changing load — The governor is no longer correcting for load. This is the failure mode the mechanism exists to prevent, and it shows up in normal use rather than as a breakdown, which is exactly why it is often left until it becomes one.
• Leverage or lash felt through the control — A control lever that feels notchy, or a linkage that has developed play, lets the engine run on while the operator is still asking for a different speed. Mechanical clearance in the linkage produces a symptom that looks like a tuning problem and is not one.
• Adjusting nut and lock nut movement — If the speed setting will not stay where it was left, the lock nuts have loosened or the stud is not seating cleanly. A governor that has been readjusted on the road is a governor whose setting nobody can now vouch for, which is a good reason to replace it rather than re-set it again.

The pattern worth holding on to is the one where the fuel system is healthy and the speed still will not hold. An engine that makes full pressure, that delivers cleanly to every cylinder and that runs without a leak will still hunt at idle, or will not come off its maximum, or will not shut down, if the governor is the part that has worn. That is the diagnostic work this page can do for you, and it is worth doing before ordering anything: a mechanical fuel pump governor fault and an injection fault produce entirely different repair jobs, and buying the wrong one costs a second removal and a machine that is still off the road at the end of it.

The second pattern is the one that develops quietly rather than as a breakdown, and it is the reason governors get left until they are worse. A governor that no longer corrects for load, or a linkage that has developed play, lets the engine run on while the operator is still asking for a different speed. Nothing alarms anyone, the machine keeps working, and the first symptom anybody reports is that it will not shut down. The fault code guide explains how to read the data behind a code, and our maintenance guide covers the filter and water separator intervals that keep a mechanical fuel system healthy.

One caution on the symptoms above, because it is the one that catches experienced people. An engine that will not shut down has an electric stop solenoid on most modern machines, and that solenoid is a separate circuit from the governor. Check the solenoid and its wiring before you conclude that the governor is at fault, and check the governor linkage for a stop lever that is binding or a spring that has lost its tension. Both faults look identical from the seat of the machine, and both are quick to test with the linkage exposed.

• Step 1. Match before you unbolt anything
  Read the identification plate on the governor you are removing and photograph it. You are looking for 10-420 235 215 on the top line. Then look at the mechanism: splined hub bore, stepped spigot, external linkage lever and a threaded adjusting stud with two knurled lock nuts. If any of that is different, stop and send us the photographs.
• Step 2. Write down the current setting before removal
  Before the governor comes off, note where the adjusting stud and its two lock nuts are set and how the linkage lever sits against its stop. That record is worth real money on reassembly, because it is the difference between a governor going back to the speed the machine was running at and a mechanic rebuilding the speed from a manual.
• Step 3. Clean the mounting face and the bore before unbolting
  Wash around the hub, blow the sealing face down and keep grit out of the splined bore and the central register. Metal left on that face ends up between the governor and the pump, and the first thing you will see is a governor that no longer holds a speed.
• Step 4. Unbolt evenly and support the housing
  Work the bolts in sequence rather than freeing one corner at a time. The hub has to come straight off the pump camshaft, and it must never be levered against the drive to free it.
• Step 5. Inspect the hub, the spigot and the camshaft end
  Check the splined hub for wear, burrs and scoring, check the spigot, and look at the material around them for the debris that a failed governor leaves behind. A hub turning against a worn or contaminated driving surface will damage the new governor quickly.
• Step 6. Renew the seals and the cover gasket
  A fresh sealing washer goes under the governor and the cover is closed on a new gasket rather than the old one. Reused seals are the most common reason a newly fitted governor weeps oil or fuel, and it is the cheapest part of the job to get right.
• Step 7. Refit square, connect the linkage properly and torque to the pump figure
  Drop the governor onto the hub square, bring the bracket up evenly, connect the control rod through its flexible joint and the control lever to the accelerator side, and torque to the figure for the pump. Those figures belong to the pump and we do not publish them for this number.
• Step 8. Set the speed from the pump outward, then verify under load
  The pump sets the range and the governor works inside it, so confirm the pump idle and maximum stops first, then use the adjusting stud to set the speed you want and lock it with both nuts. Verify the speed hot and under load before the machine goes back to work, and re-check the setting after the first run.

Two notes on what we deliberately do not print. We do not publish the tightening figure for the hub, the bracket or the adjusting stud, the governed speed range, the held-speed error figure, or the lever geometry, because all of those belong to the pump and engine the governor goes on rather than to the part, and a figure copied from a product page into a workshop manual is how a good governor gets made to feel wrong on a correct fit. Take them from the pump and engine documentation for the machine in front of you. And we do not publish a diesel fuel injection figure as a shortcut, because the hub, the bracket, the linkage and the stud 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 10-420 235 215 governor 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 a bent linkage, from a splined hub scored in handling or in service, from incorrect fitting, from a speed adjustment made beyond the figure for your pump, or from a separate fault elsewhere in the fuel control circuit. It does not extend to labour or to the machine. It is a supplier warranty from Vidishi Auto and it is not a warranty from any equipment manufacturer — we are not a dealer for any of them and no cover from any of them travels with this part.

The condition we ask about every time is what was done to the speed setting, because on a governor that is the single most common reason a replacement is returned as faulty when it is not. A governor that has been refitted without the pump’s own stops being set correctly will not hold a speed, and the fault will look identical to a bad replacement. We ask because the answer changes what we advise, not because we are looking for a reason to refuse: tell us where the adjusting stud and its two lock nuts were set on the old unit, and we can usually 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 1 piece, and the basis is worth stating because the published minimum is expressed differently. This line carries a weight-based minimum of one kilogram, which is ordinary for a cast assembly of this size: heavy parts are quoted and shipped by weight rather than by a piece count. One governor is well above one kilogram, so the effective minimum is one unit and one unit clears the listing minimum in full. There is no awkward arithmetic where a buyer has to buy two to reach a threshold, and there is no minimum order quantity in any other sense of the word on this page.

Demand for a governor of this type arrives one fault at a time, because a governor failure is what takes a machine off the road and the repair is done once, properly. A single unit covers that job, and it lets one governor sit on the shelf as the known-good unit for a speed check before anything else is committed. From there the line scales normally: a workshop running several machines will take one per engine, and a distributor will take them alongside the rest of a fuel system order on the same paperwork.

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 maker-branded product, it is not a factory boxed original and it is not a governor rebuilt from an exchange core. The maker mark visible on the identification plate in our photography is recorded on this page as a fact about the plate, because a buyer doing incoming goods inspection needs to know what they are receiving, and that is a different question from what brand the goods are branded with. If your paperwork needs a specific brand on it, this is not that product, and we would rather tell you now than have a delivery rejected at inspection. 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, the three areas we watch are the splined hub, the stepped spigot and the linkage lever. A hub knocked out of register, or a spigot marked, will not seat properly on the pump camshaft and will damage the new governor within hours of running, and a bent linkage lever is a fault that looks like a speed-control problem for weeks afterwards because the governor still turns. All three are packed protected on every unit, and all three are worth checking on arrival before the box goes into stores. The identification plate is worth a glance at the same moment: if the number on the plate is not the number you ordered against, that is the moment to raise it rather than after the governor is on the pump.

A governor is a small assembly of precisely machined parts, and the failure modes are all in the interfaces, so this line is checked at unit level rather than by sample. Every batch passes an incoming check for the numbers on the identification plate, an inspection of the splined hub and the stepped spigot for scoring and deformation, a confirm that the linkage lever, its serrated washer and the stop tab are present and undamaged, a check that the adjusting stud and both lock nuts are clean and turn freely, a check that the plugged ports on both flanks are clear, and a packed-weight confirmation against the documented figure. The supplier shows an ISO 9001 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 plate and the pump 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 the numbers read off the identification plate of the unit you are removing, the pump model and the machine details, and we check the whole set against what we supply before quoting. That last item is the one people skip, and on a governor it is the one that matters most, because the part number and the listing number are not the same identifier and a published number series tells you the component class and nothing about your pump. Two minutes with the plate in front of you is cheaper than a governor that arrives and does not hold a speed.

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 governor matched on a number range when the plate on the old unit is available. If that costs us an order, it is still the right call: a governor that arrives mismatched costs a workshop a second removal, and that is the failure we exist to prevent. If anything on this page is unclear, the contact page lists every route to us, and a written answer is always better than a guess on a workshop schedule.