Cat 320D vs 320D2: Filter & Part Number Differences

Two Generations, Two Engines

The 320D was the 20-tonne excavator Caterpillar sold through the mid-2000s and into the early 2010s, and it is powered by the C6.4 ACERT six-cylinder. The 320D2 replaced it with a C4.4 ACERT four-cylinder — a smaller, higher-revving engine with a different fuel system and a different lubrication circuit. That single change explains almost every part number in this article: filtration is designed around the engine, so when the engine changes, the service set changes with it.

On a jobsite the two machines look like the same machine, and on an invoice they are both "a 320". They are not the same machine to maintain. The 320D2 is also not the last step: the 2017 320D2/D2 L builds sold against Brazil's MAR-1 standard moved to a C7.1 engine, which brings a third filter set, and from 2018 the 320 and 320 GC took over the slot. On a used machine, the serial prefix tells you more than the badge does.

The Serial Prefix Is the Part Number

Cat publishes service parts per machine group and serial prefix rather than per model name, and the 320D/320D2 family is the clearest example of why. The prefix is the first three letters of the PIN plate on the machine — for example GBA01234 — and it is the only input that survives a repaint, an engine swap or a rebuilt machine sold through three dealers.

Machine / prefix	Engine	Oil filter element	Fuel element	Water separator	Air filter (main / safety)
320D — FAL, JFZ	C6.4 ACERT	1R-0739 (spin-on)	1R-0751	326-1644	131-8822 / 131-8821
320D GC — PCM	C6.4 ACERT	1R-0739 (spin-on)	1R-0751	326-1644	131-8822 / 131-8821
320D — MZD	Later 320D build	1R-1807	364-5287	438-5386	131-8822 / 131-8821 (dust-valve variants 6I-2501 / 6I-2502)
320D2 — GBA, ZBD	C4.4 ACERT	322-3155 (cartridge)	1R-1804	438-5386	528-7222 generation — confirm prefix
320D2 GC — JFM, ZBH	C4.4 ACERT	Listed against the newer 320/320 GC service set — confirm prefix	360-8960 appears for later 320D2 GC prefixes	Confirm prefix	131-8822 / 131-8821 (JFM) · 528-7222 (ZBH)

Two rows in that table are there to make a point. First, the 320D itself spans two filter families: the common FAL/JFZ/PCM builds take 1R-0739 and 1R-0751, while the MZD prefix takes a completely different set — 1R-1807, 364-5287 and 438-5386. Ordering "320D filters" without a prefix is how a container of wrong elements gets shipped. Second, the 320D2 engine oil element is a cartridge, not a can, and that changes what arrives in the box.

Where the Two Machines Do Line Up

The hydraulic side is the one place the generations agree. A 20-tonne Cat excavator has three hydraulic filter positions — pilot, case drain and return — and the same elements serve both machines: 5I-8670 for the pilot circuit, 093-7521 for case drain and 179-9806 for the return. That is why those three numbers are listed for 320D and 320D2 together on this site, and why a customer who buys the hydraulic set ahead of the machine arriving is usually safe.

Everything on the engine and fuel side does the opposite. The oil, fuel, separator and air numbers are generation-specific: 1R-0739 against 322-3155 on the oil side, 326-1644 against 438-5386 on the separator side. If a supplier quotes you the same filter set for a 320D and a 320D2, they have not read the prefix.

The Three Mistakes That Reach Us

Ordering from the last invoice. Used 20-tonne machines change hands with a service history that ends the day the previous owner found a cheaper supplier, and that supplier may have been selling whatever sat on the shelf. The stamped number on the element you remove beats any invoice.

Assuming 322-3155 is a spin-on can. Cat classifies it as an element assembly — a cartridge that drops into a housing, quoted at 4.043 in (102.7 mm) diameter and 8.713 in (221.3 mm) length, standard efficiency. Aftermarket sellers quote 322-3154 alongside it, which on some lists is the housing side of the pair. A photo of the housing settles it in seconds.

Trusting a cross list that spans engines. The 320D2 fuel element 1R-1804 is cross-listed to Perkins 26560201 and 934181 numbers because it also serves C4.4 and 3054 engines; the 320D2 separator 438-5386 appears on generator-set lists as well. Cross numbers are leads for a quotation, not a fitment guarantee.

Cross-Reference Numbers for Both Sets

Cat number	Position / machine	Cross references we can confirm
1R-0739	Engine oil, 320D FAL/JFZ/PCM	Baldwin B7600 · Donaldson P554004 · Fleetguard LF667 / LF3730 · MANN W11102/14
1R-0751	Fuel, 320D FAL/JFZ/PCM	Baldwin BF7632 · Donaldson P551315 · Fleetguard FF5324 · Cat 306-9199
326-1644	Water separator, 320D FAL/JFZ/PCM	Donaldson P550626 · Fleetguard FS19820 · Baldwin BF1284-SP
322-3155	Engine oil cartridge, 320D2	Sakura EO-55010 · HIFI SO10112 · SF-Filter SO97032
1R-1804	Fuel element, 320D2	Fleetguard FS20009 · Donaldson P551354 · Baldwin BF7679 · Perkins 26560201
438-5386	Water separator, 320D2 and 320D MZD	Donaldson P501108 · Fleetguard FS20131 · also quoted as 382-0664
179-9806	Hydraulic return, both generations	No cross number we can confirm — we do not publish one

On prices, the honest baseline is the same one we quote on every model page: quality aftermarket elements for these numbers typically land 30–60% below OEM list. We publish no service intervals here because Cat sets them per machine, serial range and duty cycle — the Operation and Maintenance Manual for your serial is the document that governs, and mining and quarry work is treated as severe duty.

How to Order Either Set in One Message

Four things and there is nothing left to guess: the three-letter serial prefix off the PIN plate, the machine serial number, the stamped numbers on the elements you are replacing, and a photo of the elements and their housings. We confirm the group against the parts reference guide, match the efficiency grade rather than just the thread and the size, and quote within 24 hours. Where a number sits near a generation boundary — the MZD-prefix 320D and the later 320D2 GC prefixes are the two we see most — the photo is what decides it, and we will say so rather than ship on an assumption.

FAQ

Q: How do I tell whether my machine is a Cat 320D or a 320D2?
A: Read the PIN plate, not the decal. Cat issues service parts by serial prefix: FAL, JFZ, MZD and PCM are 320D-family machines, while GBA, ZBD, JFM and ZBH are 320D2-family machines. As a cross-check, the 320D runs the C6.4 ACERT engine and the 320D2 runs the C4.4 ACERT — and the engine oil filter tells the same story, because the 320D uses a spin-on can while the 320D2 takes a cartridge element that sits in a housing.

Q: Can I use Cat 320D filters on a 320D2?
A: Not for the engine or fuel side. The 320D oil filter 1R-0739, fuel filter 1R-0751 and water separator 326-1644 are a different filter family from the 320D2's 322-3155, 1R-1804 and 438-5386, and the air filters differ as well. The hydraulic elements are the exception: the pilot, case drain and return positions carry the same numbers across the 20-tonne Cat family — 5I-8670, 093-7521 and 179-9806.

Q: What is Cat 322-3155 and why is it a cartridge element?
A: 322-3155 is the engine oil filter for the 320D2 generation — Cat lists it as an Element Assembly, cartridge type, standard efficiency, at 4.043 in (102.7 mm) diameter and 8.713 in (221.3 mm) length, and it also fits 320D2 L, 320D2 GC, 320E, 320, 320 GC, 318D2 L, 329D2 and 330D2 machines. It is a drop-in element inside a housing rather than a spin-on can, which is why a 320D2 service is a cartridge job while a 320D service is not.

Q: What part numbers do I need for a full filter service on a Cat 320D2?
A: For the GBA and ZBD prefixes Cat's parts reference guide lists engine oil element 322-3155, fuel element 1R-1804 and water separator 438-5386; the air filter for those prefixes is the 528-7222 generation, and the hydraulic positions are 5I-8670 (pilot), 093-7521 (case drain) and 179-9806 (return). Later 320D2 GC prefixes are listed against part of the newer 320 service set, so send us the serial prefix and we confirm the exact set before quoting.