Mitsubishi Selfjector
Spare Parts Supplier
Bowl parts · Gravity discs · Drive train · Samgong licence build
One machine, and the three companies whose names appear on it
The separator spare parts hub lists this maker alongside the two European ones. What follows is what a hub cannot carry: why a Selfjector request often has to name a company that did not design the machine, and why the letter after the model number is a series name rather than a size step.
Genius, and a gravity disc that arrives loose
On the standard build the gravity disc is packed separately from the bowl at delivery and an appropriate one has to be selected and fitted — which is why a bowl ordered as an assembly can turn up without the component that sets the interface. The G-HIDENS build, written with a second letter, takes the oil without gravity-disc adjustment and needs no water sealing, watching accumulated water with a pressure sensor in the circulation line instead.
Hercules, with a water valve on top as an option
The maker calls SJ-H, the Selfjector Hercules, the latest version of the line, and its product page leads on the bowl: a field-proven pilot valve system, then two options for low-grade fuel. The H-HIDENS version is marked by a second H — SJ60HH against the standard SJ60H — and SUPER HIDENS adds an automatic valve on top of the machine that discharges separated water from the rotating bowl without operating the main cylinder. A gear pump for low-viscosity fuel is standard here.
Four generations answer to "SJ"
Spares catalogues for this maker list an OP series and then four generations under one abbreviation: a plain numbered SJ series, an SJ-F series and the G and H series. A line that says only "SJ" therefore narrows nothing: on the current series even the letters after the number change the machine, SJ60H being the standard build and SJ60HH the H-HIDENS one.
A Korean-built ship carries two names
Samgong states that Samgong-Mitsubishi Selfjector is the brand name for oil purifiers it manufactures under a manufacturing licence contract with Mitsubishi Kakoki of Japan. On tonnage built in Korea the machine is commonly labelled with both names and catalogues are published jointly, so a search against the Japanese name alone can miss the book your machine is in.
How this bowl opens, and why that decides the seal list
Bowl-opening is where separator designs actually differ, and it is the reason a parts list written for one maker does not transfer. On this machine the mechanism is hydraulic and the working fluid is water.
The maker's own description runs like this. During purification the pilot valve is closed, so the main cylinder is held shut by the pressure of operating water standing in the closing valve water pressure chamber. To discharge sludge, operating water is admitted to the opening valve water pressure chamber, the pilot valve opens, the water in the closing chamber drains away, and the main cylinder is pushed open by the liquid pressure in the separation chamber itself. Every noun there is an order line: pilot valve and its packing, main cylinder, main seal ring, drain nozzle, sludge ports and the operating water valve group. A bowl that will not close, or discharges when it should not, usually traces back to one of them — and none exists in that form on a machine that opens its bowl another way, so a line copied from another maker's parts list finds no match here at all.
The drive is the second thing to read before writing a line. The bowl vessel is a body, a hood and a nut, with the separation chamber built from the disc stack and a top disc on a distributor. Below it the vertical shaft is driven up to speed by a spiral gear on the horizontal shaft and a pinion on the vertical shaft, the horizontal shaft runs in ball bearings held in two numbered housings, and a friction clutch — the item the manuals also call the friction block — sits between the motor and the horizontal shaft. Purified oil leaves through a paring disc that Mitsubishi literature calls the centripetal pump.
Materials are published for the parts that get compared, which makes them worth quoting into a request: a high-tension stainless steel bowl with a carbon steel bowl nut, stainless steel discs, a cast iron frame, a special aluminium bronze spiral gear and a special alloy steel vertical shaft.
What comes off a Selfjector, from the bowl outward
Grouped the way the machine is stripped: the bowl and its hydraulics, the interface components, the drive, the systems around it, and last the panel.
- Bowl bodies, bowl hoods and bowl nuts
- Disc stacks, individual discs and top discs
- Distributors and distributor sealing parts
- Main cylinders and main seal rings
- Pilot valve assemblies, pilot valves and pilot valve packings
- Drain nozzles and sludge port sealing items
- Gravity discs, selected against the oil rather than the model
- Clarifier discs and sealing rings for clarifier operation
- Centripetal pump components for the purified oil outlet
- Operating water valve internals and manifold solenoid valve units
- Water supply device and strainer parts
- Vertical shafts, pinions and spindle bearings
- Horizontal shafts, ball bearings and bearing housing parts
- Spiral gears and gear housing seals
- Friction clutch blocks, counted for the machine's supply frequency
- Oil seals and gasket sets for the frame and bowl
- Suction gear pump gears, bushes and casing parts
- Oil heater elements and gaskets where fitted
- HIDENS pressure sensors and circulation line fittings
- Multi-monitor display parts and detector items
- Control panel modules read from the panel's own plate
- Complete overhaul O-ring and gasket kits
Two lines here are habitually under-specified. A gravity disc is chosen for the oil being treated and the temperature it is treated at, not looked up from the machine number; the gravity disc selection guide covers what settles the choice. A disc stack can mean a complete stack, a quantity of discs, or a stack plus its top disc, and we read the interpretation back before pricing.
What a Selfjector request has to name, and which plate it comes off
There are usually three labels on or beside this machine and they answer different questions. Photographing all three removes most of the correspondence that would otherwise follow.
- Model as marked, with every letter after the number — SJ60HH, not SJ60H or SJ60, since on the current series the second H marks the H-HIDENS version
- Which company name the machine carries: Mitsubishi Kakoki, Samgong-Mitsubishi, or both
- Serial or manufacturing number from the plate, photographed rather than transcribed
- Whether the unit runs as a purifier or as a clarifier at present
- Whether a gravity disc is fitted at all, and which one, since HIDENS builds run without one
- The oil being treated and the temperature it is treated at, for any interface component
- Whether the biodiesel-ready parts kit Mitsubishi Kakoki released in 2024 has been fitted, since it replaces standard parts and stays in place when the machine goes back to conventional fuel
- Mains frequency the machine was built for, for drive and friction parts
- Operating water supply arrangement and whether the solenoid group is a manifold unit
- Panel designation from the panel's own label, which may name a third company
- Whether an oil heater, butterfly valve or cleaning table came with it
- Hours on the bowl since the last full overhaul, and any earlier reconditioning
- The fault as it presents: no discharge, discharge in service, water in purified oil, vibration on run-up
- Part numbers with the catalogue and edition, as the joint-name and Japanese books are separate documents
- Photographs of the machine plate, the panel label and the component in place
Tools for this equipment: the oil cleanliness code reader for an oil analysis report and the O-ring size finder for loose O-rings. For a unit on fuel duty, the marine fuel grade reader decodes the ISO 8217 grade or trade name of the fuel it cleans. Where the bunker received has to be squared with the delivery note, the bunker quantity calculator gives the volume at 15 °C and the mass from the tank temperature and the density. Where the heater ahead of the separator is set by viscosity, the fuel viscosity-temperature calculator finds the temperature for a target viscosity from two measured points of the fuel.
Where a licence build helps a buyer, and where it stops helping
The licence arrangement is the unusual thing about supplying this machine, and it cuts both ways. Because the same design has been built in Japan and, under licence, in Korea, a machine on a Korean-built ship has documentation, a spares catalogue and a service history under a joint name — which widens rather than narrows the paperwork a request can be answered from, and means a plate carrying one name is not evidence that the book carrying the other is wrong. What it does not do is make the two interchangeable by assumption: two catalogues published under two company names for one design still have to be reconciled against the machine, from the model marking and the serial rather than the family name.
Beyond that the split follows the machine. Sealing items, gaskets and O-ring kits, ball bearings, friction blocks, couplings, oil seals and pump wear parts are ordinary supply questions with measurable geometry and stated material, and a verified alternative can be reviewed on them where your approval requirements allow, with dimensions and material records placed alongside the offer. Bowl bodies, hoods and nuts, disc stacks, gravity discs, the pilot valve group, the main cylinder and the vertical shaft go to an OEM-route review, for a reason that is mechanical rather than commercial: they are balanced, matched or interface-critical parts of a rotating assembly, and geometry alone does not establish that one belongs in that bowl. Reconditioning the removed assembly is often the honest answer there. The panel is a separate enquiry again, quoted from its own plate. How each is worked through is set out in the spare parts supply process.
Selfjector parts — questions we get
My plate says Samgong-Mitsubishi. Is that a Mitsubishi machine or not?
Both, in the sense that matters to a buyer. Samgong states that Samgong-Mitsubishi Selfjector is the brand name for oil purifiers it manufactures under a manufacturing licence contract with Mitsubishi Kakoki of Japan, so the design is Japanese and the build is Korean. Documentation therefore exists under the joint name as well as the Japanese one, and a request quoting the plate exactly as printed reaches the right book faster than one that tidies the name to a single company.
There is no gravity disc in my bowl. Has one been lost?
Probably not. On the standard build the disc is packed separately at delivery and has to be selected and fitted, so an unused bowl legitimately has none. On the HIDENS builds the machine is designed to take the oil without gravity-disc adjustment and needs no water sealing, using a pressure sensor in the circulation line instead. Which answer applies depends on the letters after the model number.
Can you quote the control panel from the separator model?
Not reliably, and it is better to say so than to guess. Purifier auto control systems on these machines carry their own marking — panels appear labelled KTP FC or KTP FC-F, with a name on them that is neither the designer of the separator nor always the company that built the bowl. Photograph the label inside the panel door and the module you need.
Are Alfa Laval or Westfalia bowl parts an option on a Selfjector?
No. Bowl-opening hardware, disc geometry and interface components are specific to each design, and this one opens its bowl with operating water acting on a pilot valve and a main cylinder — hardware the other two do not have in that form. Where those machines are also on board they are covered on the Alfa Laval and GEA Westfalia pages; a mixed separator room can be sent as one list, each machine identified from its own plate.
Is Vessel Core connected to Mitsubishi Kakoki Kaisha?
No, and there is no agreement of any kind. Vessel Core holds no dealership, distribution, representation or partnership agreement with Mitsubishi Kakoki Kaisha, and quoting a component against one of its designations implies no approval by the maker and no claim of interchangeability.
Submit your RFQ now.
Send the model as marked with every letter after the number, the company name on the plate (Mitsubishi Kakoki, Samgong-Mitsubishi, or both), and photographs of the machine plate and the component. Vessel Core reviews the supply route and prepares a structured quotation.
