Komatsu PC300-8 Filter Set: Six Numbers, Three Traps

Published: November 2, 2026By CN Machinery

Komatsu publishes a specification page for every filter it sells, and publishes no fitment list on any of them. That single gap explains most of the wrong orders on a 30-tonne machine: the buyer has a model badge, the supplier has a catalogue, and nobody has the whole set of numbers in one place.

Everything below was read from Komatsu's own parts pages on 2 November 2026. Where a machine dimension appears it comes from a Komatsu brochure, cited in the text.

1. The Set, By Circuit

Circuit	Komatsu's part name	Number	What Komatsu publishes
Engine air, main	Air Filter	600-185-5110	Element, 405 mm high, 282 × 282 mm, Standard White media
Engine air, safety	Air Filter	600-185-5120	Element — no measurement block published
Engine air, as a kit	Air Filter Kit	600-185-5100	Element Kit, 419 mm high, 276 × 276 mm, High Efficiency media
Hydraulic	Hydraulic Filter	207-60-71181	Element — no measurement block published
Fuel, pre-filter	Pre-Fuel Filter Assembly	600-319-3610	Spin-on, Ø 94 mm, 168 mm high, thread 1-14UNS-2B
Fuel, main	Main Fuel Filter	600-319-3750	Spin-on, Ø 94 mm, 176.3 mm long, thread 7/8-14UNF-2B, paper media
Fuel, main (cartridge build)	Main Fuel Filter	6754-79-6140	Cartridge-Element — no measurement block published
Engine lube	Engine Oil Filter	6742-01-4540	Cartridge-Element, 302 mm high, dual media
Cooling system	Corrosion Resister Filter	600-411-1191	Spin-on, Ø 97.5 mm, 99.6 mm long, thread 11/16-16UN-2B

Two things about that table. First, four of nine rows carry no size at all, because Komatsu does not print one — we would rather leave the cell empty than fill it with a supplier's bounding box. Second, the fitment column is missing on purpose: Komatsu's pages name the part, grade and size but never the machines. Where we say a number is listed for the PC300-8 it comes from supplier catalogues, which is a starting point, not a certificate.

2. One Engine, Two Machines

	PC300-8	PC350LC-8M0
Engine	Komatsu SAA6D114E-3	Komatsu SAA6D114E-3
Flywheel horsepower	Gross 194 kW / 260 HP at 1950 rpm; net 184 kW / 246 HP (Komatsu PC300-8 brochure)	Gross 194 kW / 260 HP; net 187 kW / 250 HP (Komatsu PC300/350-8M0 brochure)
Operating weight	31,100 – 32,010 kg on 600 mm shoes	35,800 – 36,600 kg for the LC-8M0
Bucket	0.52 – 1.80 m³	Larger class, same engine
Air cleaner as specified	Dry type, double element	Dry type, double element

The 350 is not a different engine family; it is the same SAA6D114E-3 in a wider undercarriage with a bigger bucket. Komatsu even prints both machines in one brochure with one engine specification and one air cleaner line. That has a straightforward commercial consequence for a fleet: three PC300-8s and one PC350LC in the same yard share one air filter number, one lube cartridge and one fuel set. Stocking them separately is the expensive way to do it.

Note the rating drift rather than smoothing it: the PC300-8 brochure quotes 184 kW net, the later PC300/350-8M0 brochure quotes 187 kW. Same engine code, two printed figures, so we show both.

3. Trap One: The Air Cleaner Is Sold Three Ways

	600-185-5100	600-185-5110	600-185-5120
Komatsu's part name	Air Filter Kit	Air Filter	Air Filter
Style	Element Kit	Element	Element
Published size	419 mm high, 276 × 276 mm	405 mm high, 282 × 282 mm	None published
Media as published	High Efficiency	Standard White	Not published
Position	The pair, boxed	Main, outer	Safety, inner

A kit that measures 419 × 276 against an element at 405 × 282 is not the same article with a different label. Fourteen millimetres on height and six across is a different moulding, and Komatsu also grades the media differently — High Efficiency against Standard White. They may sit in similar housings; they do not swap.

The second half of this trap is the double element. Komatsu's brochure specifies a dry type cleaner with two elements, and the safety element 600-185-5120 nests inside the main one. It is not a spare for the main element and it will not carry the dust load on its own — it exists to protect the engine during the window between a damaged main element and its replacement. Anyone quoting you "one air filter for a PC300-8" is quoting half a cleaner. Order the 5110 main element and the 5120 safety together, or order the 5100 kit and check its 419 × 276 figures against your housing.

4. Trap Two: Four Hydraulic Numbers, One Name

Komatsu files 207-60-71181, 207-60-71180, 207-60-71182 and 20Y-60-31121 under one name — Hydraulic Filter — and one style, Element. Only one of them has a published measurement block: 207-60-71182, which Komatsu brands Eco-White and specifies as glass fiber media, 200 mm long, 150 wide and 150 high. The other three print "Element" and stop.

The aftermarket closes that gap by merging the family into one cross. A single P550787, HF35360 or PT9351MPG is catalogued against 71180, 71181, 71182 and 71183 at once, and for a paper element in a pilot circuit that is often perfectly fine. The failure mode is quieter: the machine came with the glass-fibre Eco-White element, the cross supplies a paper one, and nobody notices until the return filter's service interval starts coming up short. On the hydraulic side of a 30-tonne machine, the media grade is the specification — not the thread, not the can.

So we ask two questions before quoting a hydraulic element for these machines: which number was on the element you removed, and does the substitute state its media. If a supplier cannot answer the second, the cross is a guess with a part number on it.

5. Trap Three: The Fuel Side, Where One Block Changes

Number	Name	Diameter	Length / height	Thread
600-319-3610	Pre-Fuel Filter Assembly	94 mm	168 mm high	1-14UNS-2B
600-319-3750	Main Fuel Filter	94 mm	176.3 mm long	7/8-14UNF-2B
600-311-3750	Main Fuel Filter	No measurement block published — a separate live Komatsu number, one block different from 600-319-3750
600-311-8321	Main Fuel Filter	Not published	145 mm high	Cartridge-Element

Look at the first two rows. Both cans are 94 mm across. On a shelf, in a photo, on a packing list, they are the same object; the difference is a thread, 1-14UNS-2B against 7/8-14UNF-2B, and 8 mm of length. A buyer who orders "the 94 mm fuel filter" gets a 50 percent chance and a machine standing still while the second parcel clears customs.

Then the middle block. 600-319-3750 and 600-311-3750 are both live Komatsu part numbers, both named Main Fuel Filter, and only the 319 one publishes its dimensions. That is the sort of pair that gets transcribed by hand from a photo of a box and never questioned. Read the middle block digit by digit, and photograph the old filter's thread rather than describing it.

On the -8 build specifically, the fuel side is the one place where the generation gap matters more than the model badge. The SAA6D114E-3 runs a high-pressure common rail system, and supplier catalogues list the 600-319-3750 spin-on for the PC200-8 generation and the 6754-79-6140 cartridge for machines in the same family, while the 600-311-8321 cartridge belongs to the earlier -7 filtration layout. Both are called main fuel filter. The serial in the parts book decides, and if you do not have the parts book, the element in your hand does.

6. The Two Items Buyers Forget

The engine oil element, 6742-01-4540, is a 302 mm cartridge with dual media — not a spin-on can, which is what most buyers picture when they hear "oil filter". Order it as a cartridge and check the housing cap before the service, because a cartridge that arrives with the wrong end-cap seal is a filter you cannot fit.

The second is the corrosion resistor, 600-411-1191, a small spin-on at Ø 97.5 × 99.6 mm on an 11/16-16UN thread. It sits on the cooling side, it is cheap, and it is the item most often missing from a kit built by counting the filters a mechanic can see. If your kits keep coming up one item short, it is usually this one.

7. What This Page Does Not Publish

No prices: they depend on quantity, whether the order is one service or a year of them, and the lane. No micron ratings or efficiency percentages: Komatsu prints grade names for these numbers, not beta ratios, and a table cell invented to look complete is worse than an empty one. No claim that a supplier cross is a fitment. And no pretence that a model name identifies a machine — the PC300-8 and PC300-8M0 are not the same build, and the parts book is the only document that settles which one you own.

What we do instead is confirm the set against the machine before it ships. Send the model, the serial prefix, a photo of the engine plate and the measurements off the elements you removed, and the numbers come back as one quotation with one freight cost, packed and labelled by circuit.

FAQ

Q: What filters does a Komatsu PC300-8 take?
A: The service set is 600-185-5110 main air element with 600-185-5120 safety element inside it, 207-60-71181 hydraulic element, 600-319-3610 pre-fuel spin-on, a main fuel filter that is either 600-319-3750 or the cartridge 6754-79-6140 depending on build, 6742-01-4540 engine oil cartridge, and 600-411-1191 corrosion resistor. Komatsu publishes a specification for each of those numbers but no fitment list, so the count of each position comes from the parts book for your serial, not from a model name.

Q: Is Komatsu 600-185-5100 the same filter as 600-185-5110?
A: No. Komatsu files 600-185-5100 as an Air Filter Kit with Element Kit style and publishes it at 419 mm high, 276 wide and 276 deep in High Efficiency media. 600-185-5110 is filed as an Air Filter, Element style, 405 mm high, 282 wide and 282 deep in Standard White media. The 14 mm height and 6 mm difference across mean they are separate articles, not two labels for one part. 600-185-5120, the safety element, has no published dimensions at all and sits inside the main element rather than replacing it.

Q: Are Komatsu 207-60-71181 and 207-60-71182 the same hydraulic filter?
A: They are separate Komatsu numbers. 207-60-71182 is the one with a published specification block: Komatsu brands it Eco-White and gives the media as glass fiber at 200 mm long, 150 wide and 150 high. 207-60-71181 publishes the style Element and nothing else. Most aftermarket catalogues merge 71180, 71181, 71182 and 71183 into a single cross such as P550787, HF35360 or PT9351MPG, which is why a glass-fibre Eco-White element can quietly be replaced with a paper one. Ask what media the substitute uses before you accept the cross.

Q: Will PC300-8 filters fit a PC350-8?
A: On the engine side, yes on paper: both machines are printed on Komatsu brochures with the SAA6D114E-3 engine and the same dry-type double-element air cleaner line, so the air pair, the lube cartridge and the fuel set are shared. Do not extend that to the hydraulic circuit. The return and pilot elements sit in housings that are not tied to the engine, and Komatsu publishes no model list for them, so confirm those two against the element you remove. A shared engine is a good reason to stock one air number for both machines; it is not a reason to order hydraulic elements blind.