9700360403 Governor Flyweight Set for Mitsubishi 4D34

The application we stand behind is the published engine family, and it is worth being exact about how far that goes. The numbers 9700360403 and ME226698 are published against the complete mechanical fuel injection pump assembly built for the Mitsubishi 4D34, 4D34T and 4D34T8 four-cylinder inline diesel on 3.907 litres, with a 104 mm bore and a 115 mm stroke. Published output for that family varies with the machine variant and the emission standard; one published machine example is the 4D34-TLE2A unit in aKATO HD512-III excavator, rated at 68 kW at 2050 rpm with 360 N·m at 1600 rpm and a compression ratio of 16.5 to 1. We quote that because it is attributable to a named machine, not because it stands for the whole family.

Why the removed part matters more than the number. The two numbers tell you which pump the governor belongs to. They do not tell you the shape of the weights inside it, and they cannot, because a governor is built to a mechanical principle rather than to a published outline. A flyweight set is matched by its cast body profile, its stepped bore, the pair of springs and the size of the pivot pin — four things you can lay side by side on a bench in under a minute. The buying guides set out the general method, and the comparison charts cover part number families where a chart exists.

What this page is not claiming. We do not claim that these numbers identify a flyweight in any manufacturer catalogue, because no source we can stand behind publishes them that way. We do not claim the set fits any 4D3x engine outside the three published variants, and we do not extend coverage to individual machine models or model years, since the published attribution is a catalogue entry rather than a build record. Adjacent numbers in the same series exist and they are not interchangeable with this one; if your governor carries one of those, send it to us instead of ordering on the assumption that the shape is close enough. The glossary explains the terms used above if any of them are unfamiliar.

A diesel engine that has to hold a steady speed does not do it by itself. Demand moves constantly — a load comes on, a load comes off, the grade changes — and without something watching speed the engine would wander. On a mechanical injection pump the part that watches is the centrifugal governor, and the part that does the watching inside it is the flyweight. The weights spin with the governor, and two forces act on them at once: centrifugal force, which grows with speed and pushes them outward, and the governing spring, which pushes them back inward. The position the weights settle at is the sum of those two forces.

Position matters more than it looks. The weights carry a sleeve, and the sleeve position is what decides how long the pumping element is allowed to build pressure — in other words, the working stroke. Weights further out shorten it and cut the fuel, so the engine slows. Weights moving inward do the reverse, adding fuel so the engine picks up again. Everything the governor does, it does by moving those weights and changing that one distance. This is why a governor that has stopped moving produces an engine that will not hold its speed, rather than an engine that simply runs badly.

The naming is where ordering mistakes start, and this listing is a textbook case. The two numbers attached to this part, 9700360403 and ME226698, are published in manufacturer catalogues against a complete fuel injection pump assembly for the 4D34, 4D34T and 4D34T8 family — the whole pump, four cylinders, housing and all. What is photographed and supplied here is one component from inside that assembly’s governor. Both statements are true at once, and neither cancels the other. The practical consequence is simple: the number tells you which pump the governor came out of, and only the part itself tells you whether this set is the one you need.

The second naming trap sits inside the component itself. A flyweight is often described in the singular because that is how the mechanism is described, but a working set is a pair, one weight on each side of the governor sleeve, each with its own spring. A set that arrives with a single spring, or with one old weight and one new one, will not hold a stable speed even when every part in it is correct on its own. Pairing is not a packing preference; it is the mechanism.

Where our supply differs is what arrives, and how the numbers are handled. The equipment maker and the pump supplier publish these numbers against their own assemblies, and a buyer who needs a factory boxed pump has to go through that channel. What we supply is the governor flyweight set — a new compatible component for the same job, sold under the Vidishi Auto brand, carrying the same published reference — at a twelve set minimum with no core return. That last point matters on a workshop job: nothing has to come back, there is no exchange loop to manage, and the old set stays with you for the warranty file or the parts shelf.

One thing we will not do is dress that up. The 9700360403 set we ship is ours. It is not an original equipment product, not a manufacturer-branded product and not an exchange unit from anyone. The numbers appear on this page so you can match the governor you are working on and trace where the part came from; they are references for identification and fitment, not a claim about who made the goods. The glossary defines the terminology, and the fuel system category holds the rest of the range.

When a workshop asks whether this set is the right one, the answer is never in the number alone — it is in what came out of the governor. Which is why the five checks in the fitment section below all work on the part rather than on a model list.

Everything described above is visible in the single photograph on this page: the cast body, the spring seated on each flank, the stepped bore, and the pin, ring and plate laid out alongside. One image is all the source material we hold for this number, and we would rather show it than pad the gallery with something that is not this part.

How we label data. Confirmed means a value read directly from the goods we handle, in this case from the single photograph on this page — the component group, the pair of springs, the stepped bore, the cross-drilled pin, the retaining ring and the slotted plate. Reference means a published catalogue number or a published engine family quoted so your paperwork can be matched, carrying no claim about origin. Not published means the field is left blank on purpose — a spring rate or a pivot tolerance that we cannot source would be worse than an empty cell, because it would end up in somebody’s parts order and somebody’s governor.

What is in the box. One governor flyweight set, supplied as a component group: the cast body with its stepped cylindrical bore and integral mounting lugs, two helical compression springs seated one on each flank, one hardened cross-drilled pivot pin, one retaining ring, and one flat plate with a curved slot and two bolt holes, exactly as photographed. No pump body, no delivery valve holder, no cam, no feed pump, no drive gear and no injector travels with this number, and no governing spring, linkage or governor housing is included either — those belong to the governor as a whole and are a separate order. A new pivot pin and a new retaining ring come with the set, so the old ones are not reused.

Read the table from the top, because the order matters. The first row is the number you order against. The second and third rows are the published reference for the assembly this set came out of, given in both its grouped and its catalogue form so that a parts system which matches one and not the other does not tell you the part does not exist. Every one of them is a Reference value: a catalogue attribution, useful for traceability and for matching your paperwork, and carrying no claim about who manufactured the goods in the box.

The ME226698 row is the one that catches people, so it is worth being blunt about it. That number, and the 9700360403 number beside it, are published against a complete mechanical fuel injection pump assembly for the 4D34 family. They are not published against an individual flyweight, because no source we can stand behind publishes them that way. We print them because suppressing them would leave you unable to trace where the part belongs, and we state plainly what they point at because a number that quietly means something other than what it appears to mean is how workshops order the wrong thing.

The marking row is the third layer, and it is the shortest one: there is no marking. This part carries no legible part number, no cast lettering and no data plate, which you can see in the photograph. That has a direct practical consequence — there is nothing to photograph off this item to identify it later, so the record worth keeping is the set you removed plus the pump body marking and the engine plate. Keep them together in the job file rather than trusting a number written on a box.

What the table deliberately does not do is extend the mapping. We do not list a component number for the governor assembly on this engine family, because the published ones belong to adjacent members of the series rather than to this number. We do not list the adjacent series numbers as though they were alternative references for this set; they are not interchangeable and ordering one instead of this one is a mistake we cannot undo for you. If you hold a number not listed here, send it with the removed part and the pump marking, and we will tell you honestly whether we can match it. The comparison charts cover families where a published chart exists.

The practical difference shows up on the bench rather than in the box. A complete pump arrives as one large assembly that has to be matched to an engine and timed in; a flyweight set arrives as five small pieces that can be laid next to the ones you removed and compared directly, which is a far quicker way to answer the only question that matters — whether these are the same weights as the ones that came off. The counter-argument is real too: a governor that has been open has usually had more than the weights disturbed, so if the housing, the sleeve or the governing spring is damaged, replacing the set will not fix it. We would rather you know that before the order than after it.

• An idle that hunts and will not settleAt idle the governor is holding the engine against a light load, which is where a sticky weight shows first. If the machine will not settle with the throttle only slightly open, the governing side is the place to look.
• Speed that wanders at a steady throttleLoad held steady, engine speed still not. That is the clearest symptom of this set, because the weights are the part that turns speed change into a fuel change.
• Loss of response when load comes onThe governor should push fuel back in as load arrives. A weight that does not move inward freely cannot do that, so the engine sags under load it used to pull.
• A speed the engine will not hold after the governor has been openedIf the governor was recently worked on, a spring fitted the wrong way round or a linkage left disconnected produces exactly this, and neither needs new weights.
• One flank of the sleeve travelling further than the otherVisible with the governor off the engine. This is what a mixed pair of weights looks like in service, and it is why pairing is not optional.
• A worn pivot bore found at inspectionSeen with the governor open. A new pin running in an ovalised hole wears again inside months and lets the weight tilt. That wear sits in the governor housing itself, so it is a housing job rather than a set.
• Rough running that no filter work curesFilters and injectors are the usual suspects on a diesel, so a governing fault is often diagnosed late. Check whether the weights move freely before ordering anything.

Read the list as symptoms rather than a diagnosis, because every item on it has at least one other possible cause. A tired feed pump or a blocked filter produces a similar loss of response. An actuator that is slow on a machine with electronic governing produces a hunting idle that has nothing to do with weights. A spring that has been replaced with a wrong-rate item produces a speed the governor holds badly while the weights themselves are perfectly good. What separates them is inspection: open the governor and check whether the weights swing freely through their full travel, whether the pivot bore shows wear, and whether both flanks move together. A weight that sticks, a pivot bore worn oval, or two flanks moving at different rates all point at this set.

Two more practical notes. First, if the machine has recently had governor work, look there before ordering: a spring fitted the wrong way round, a sleeve left dry, or a linkage left disconnected will produce exactly the symptoms above and none of them need new weights. Second, treat one governor as a question about the machine. The set is a wear item in the truest sense — it exists to move millions of cycles — so a fleet that replaces one is usually approaching the point where the others are due, and the labour to open each governor twice is the real cost. If you are buying for a fleet, send us the engine numbers and quantities and we will work through the list with you before the invoice is raised.

1. 1. Mark the governor position before anything comes offBefore the governor is opened, mark where the drive and the linkage sit relative to the pump body. A mechanical governor has an orientation, and reassembling it a tooth or an arm out changes the speed it holds.
2. 2. Release the cover evenly and keep the linkage loadedTake the cover off in sequence rather than freeing one corner at a time, and support the linkage so the governing spring does not unload onto the sleeve as the last fastener comes out.
3. 3. Record the spring orientation as you remove itPhotograph the springs in place before they come off. A spring fitted the wrong way round after reassembly produces an engine that runs but will not hold its speed, and it is the single easiest mistake to make in this job.
4. 4. Clean the bore and the pivot before fitting anythingClean the pivot bore and the bore the sleeve runs in, and check the pin against it for wear. Grit left in either is what makes a fresh set feel stiff and then wear quickly.
5. 5. Fit the pair, not one halfBoth weights and both springs go in together. If one side is serviceable and the other is not, the serviceable half does not make the set any cheaper, because a mixed pair will not hold a steady speed.
6. 6. Seat the new pin and the new ringThe new cross-drilled pivot pin and the new retaining ring come with the set. Seat them fully and confirm the weight is free through its whole travel by hand before the cover goes back.
7. 7. Refit the cover and re-check free movementWith the linkage reconnected and the spring back on its correct side, work the mechanism by hand and confirm both flanks move together. Binding at this point means something is not seated and will not improve with the engine running.
8. 8. Verify the governed speed after the runStart the engine, check for movement at the cover, and confirm the machine holds its governed speed under load rather than only at idle. The governed speed belongs to the application, so set and record it against your own specification.

Every 9700360403 set is covered by a 12-month warranty against manufacturing defects at set level. That covers a set that arrives out of specification or fails early because of how it was made — a spring that fails on its seat, a pivot bore that is out of true, or a retaining ring that will not hold. It does not cover a body bent during removal, contamination found after the governor was already open, incorrect fitting, a spring fitted the wrong way round, or a fault elsewhere in the fuel or throttle system. It is our own supplier warranty, and no cover from any equipment maker travels with this part.

The cover sits at set level rather than at component level, which matters here because a flyweight set is five pieces that work as a mechanism. We will not settle a claim on one spring while leaving you with the old body, and we will not settle one on the body while leaving you with a spring that has been stretched. Either the set is replaced or it is not.

Two questions buyers ask. The core return question: there is none, because these are new replacement parts and nothing has to come back, so there is no exchange loop to track in your stores. And the original equipment question: what we supply is not an original equipment product, so if your procurement paperwork requires a factory boxed part, that has to come through the original equipment network. On that point we are an independent supplier of compatible parts and not a dealer for any of the equipment makers, so we will say so rather than sell you something that fails your audit.

The minimum order quantity on this line is 12 sets. That is a deliberate fit for how the part is actually demanded: a governor set is a workshop and fleet maintenance item, and a carton quantity keeps the springs, pin and ring packed together per set rather than loose in a sack. There is no core return and no core charge with our supply, because we sell new replacement sets rather than exchange units, so your stores do not have to run a reconciliation loop for this line at all.

We act as a diesel injection parts exporter rather than a dealer, and the practical difference shows up in three places. First, identification: because the published numbers for this set point at a complete pump assembly rather than at the flyweight, we confirm what will ship in writing before an invoice is raised, so nobody on your side has to take our word for it. Second, consistency: batches are checked as sets, so a fault found in one is traced before the next ships. Third, documentation: commercial invoice, packing list and HS code paperwork travel with every export order.

For trade buyers there are three practical points worth settling up front.

Batch photographs are available on request before a consignment is packed, which matters more on a component page than on a pump page because the parts are small and easy to confuse in a photograph. If you are ordering against a fleet list, send the engine numbers and quantities and we will work through the list with you, marking any machine whose governor needs a check before the set is fitted. Custom packaging and labelling arrangements are described on the custom packaging page, and fleet-level terms on the fleet programs page.

Distributors serving truck, bus, generator set and construction equipment workshops are the bulk of the demand on this line. If you are building a range around 4D3x mechanical injection parts and want the cross-reference work done before you list, talk to us through the partner programme or send the list directly — we would rather spend a week on your data than argue about a number afterwards.

The dimensions above are a packing estimate rather than a published manufacturer figure, and we label them that way on purpose. No source we can stand behind publishes a packaged size or a gross weight for this number, and a single listing value found elsewhere describes the complete pump assembly rather than this component, so adopting it would put the wrong figure into your freight calculation. What we give you is a defensible estimate for the component group plus a clear statement that it is an estimate. The Packaged shipping weight quoted in the hero block is the same figure on the same basis, and it is a gross shipping weight including the packing, not the weight of the part on its own, which is not published.

A trade order is packed the way the photograph shows — body, springs, pin, ring and plate together as one set per package — because the failure mode in transit on a component this small is a spring escaping its seat or a retaining ring lost in the carton, and both turn a cheap part into a second teardown of a governor that is already open. Freight modes, delivery estimates against your destination and the documentation set are covered on the shipping page, and your order reference stays traceable through it.

A governor flyweight set is a small number of small, precisely machined and cast parts, and its whole job depends on one of them moving freely through its full travel. That means the checks that matter here are about movement and pairing rather than about size, so every set is handled at set level rather than by sample.

Support is not an add-on on this line — on a component page whose published numbers point at a whole pump, it is how the order gets placed correctly. It costs nothing before you buy: send the removed flyweight set, the engine code plate and the pump body marking, and we will tell you in writing whether this set matches, whether a different number in the series is the right one, or whether what you need is a governor rather than a set.

Supplier note. WholesaleAutoPartsDirect supplies compatible automotive parts independently. What arrives on this line is a new compatible replacement — not an original equipment product, not a manufacturer-branded product, and not a reconditioned, remanufactured or exchange unit. The numbers 9700360403 and ME226698 are shown as published catalogue references for identification and fitment only, and the set itself is a component group rather than a complete pump. If none of that suits your procurement, the contact page lists the routes, the help centre covers ordering and documentation questions, and the FAQ page covers the terms. Order tracking for an existing consignment is on the order tracking page.