Excavator Filter Cross Reference: How to Match Numbers

📅 Published: September 13, 2026✍️ By CN Machinery

Every week we receive enquiries that begin the same way: "I need the filter for a 320D — the cross number is B7600, is that right?" Sometimes it is. Often the number came from a cross-reference site that lists a filter for the machine family rather than for the specific build. This guide explains how these numbers are built, lists the cross references we have verified, and sets out the three checks that stop a wrong-element delivery.

1. How OEM Filter Numbers Are Built

Both Cat and Komatsu use structured numbers, and the structure tells you how much freedom the aftermarket has.

• Caterpillar uses a group prefix plus a sequence: 1R-0739 (engine oil), 1R-0751 (fuel), 5I-8670 (hydraulic pilot), 131-8822 / 131-8821 (air outer / inner), 326-1644 (fuel-water separator), 093-7521 (case drain). The dash is a formatting convenience — searching 1R0739 and 1R-0739 returns different result sets, so try both.
• Komatsu typically uses six digits, a dash and seven more: 6736-51-5142 (engine oil filter for 6D107-family engines), 600-185-4100 (air element for PC200-8/PC220-8), 20Y-60-41130 (hydraulic return filter).
• Supersessions move you onto the wrong list. Komatsu publishes 6736-51-5141 and 6736-51-5142 for the same position; Cat replaced the fuel-water separator 1R-0770 with 326-1644; the 320D air element is also quoted as 134-0685. If your invoice is three years old, the number on it may be one generation behind the element in the machine.

2. Cross References We Have Verified

The table below lists cross numbers that appear on more than one independent aftermarket source. They are the ones we are comfortable quoting — but read the caution under the table before you order against them.

OEM number	Position / machines	Cross references seen on multiple lists
Cat 1R-0739	Engine oil filter — 320D, 320D L, 320D GC (FAL/PHX-type prefixes); older numbers 2P-4004, 1R-0658, 1W-3300	Baldwin B7600 · Donaldson P554004 (P550490 also listed) · Fleetguard LF667 / LF3730 · MANN W11102/14 · Sakura C-5501
Cat 1R-0751	Fuel filter — 320D family	Baldwin BF7632 · Donaldson P551315 · Fleetguard FF5324 · Cat 306-9199
Cat 326-1644	Fuel/water separator — 320C, 320D, 320D L/GC, 323D, 953C/963C; replaces 1R-0770	Donaldson P550626 · Fleetguard FS19820 · Baldwin BF1284-SP
Cat 5I-8670	Hydraulic pilot filter — 320D, 320D L, 320D GC, 320D2	Baldwin BT9464 · Donaldson P573481 · Fleetguard HF35519 · HIFI SH66050 · SF Schupp SPH94010
Cat 093-7521	Hydraulic case drain filter — 320D family; also on 312C/312D/315D/320C/323D fitment lists	Donaldson P551348 · VMC HF551348
Cat 131-8822	Air filter, outer element — 320B–320F L, M325B, CP/CS compactors	Donaldson P536457 · Fleetguard AF25589 · Baldwin RS3736 · WIX 46701 / 546701 · Sakura A8508 · MANN C24642
Cat 131-8821	Air filter, inner (secondary) element — same machine group as 131-8822	Fleetguard AF25624 · Baldwin RS3737 · MANN CF1398
Komatsu 6736-51-5142	Engine oil filter — 6D107-family engines: PC200-8/PC200LC-8, PC220-8, PC210-10, WA200-6; earlier number 6736-51-5141	Fleetguard LF16006 · Baldwin B7181 · Donaldson P550909
Cat 179-9806	Hydraulic return filter (UHE, synthetic media) — 320D/320D2 L	Not published — we do not quote unconfirmed cross numbers for this element

Two cautions. Cross lists are broad by design: the same 093-7521 also appears against compact equipment, and one cross list for 6736-51-5142 runs from Komatsu PC200-8 through to Doosan and Daewoo machines. A cross number tells you a supplier makes something that fits a machine with that number — not that it fits yours. Second, where we could not confirm a cross number from more than one source, we left the row blank rather than fill it in.

3. The Measurements That Actually Decide Fitment

A cross number is a lead. These are the dimensions that decide whether the element goes in:

OEM number	Style	Thread / seal	Size	Grade
Cat 1R-0739	Spin-on canister	1 1/8-16	OD 108 mm; 256–264 mm high (suppliers differ)	Full-flow lube
Cat 1R-0751	Spin-on canister	7/8-14-2B	OD 85.7 mm; 181.5 mm high	2 µm absolute, cellulose
Cat 5I-8670	Spin-on canister	M45 × 2.0	OD 87–87.3 mm; 154–155 mm high	~10 µm, advanced efficiency
Cat 093-7521	Spin-on canister	1 1/8-16	OD 93–95 mm; 172–173 mm high	Standard efficiency
Cat 131-8822	Radial-seal outer element	Radial seal	OD 237 mm; ID 130.9 mm; 330.2 mm long	ISO 5011, 99.9%
Cat 131-8821	Radial-seal inner element	Radial seal	OD 132–134 mm; ID 94–94.5 mm; 323 mm long	Standard efficiency, secondary
Komatsu 6736-51-5142	Engine oil element (see note)	Confirm by element	94 mm diameter; 176 mm high	Full-flow lube

Note on Komatsu 6736-51-5142. Komatsu's own parts catalogue classifies this number as a cartridge element and quotes 94 mm × 176 mm. Aftermarket catalogues for the same number describe a spin-on canister with a 1 1/8-16 thread and quote the same 94 mm × 176 mm envelope. When two catalogues disagree on the housing type, the part in your hand settles it — photograph it and we will match it.

4. Three Checks Before You Order

• Measure the old element, not the machine. Outside diameter, overall length, thread pitch or seal bore. A filter with the right thread and the wrong length either bottoms out before the seal seats or leaves the bypass open.
• Read the number off the element. Machine badges lie after a rebuild, and used excavators arriving from Africa and the Gulf frequently carry mixed-generation components. The stamped number is the only reliable input.
• Send the serial with the enquiry. On Cat machines the parts reference guide is issued per machine group and serial range — this is exactly where 320D and 320D2 filtration diverges. Tell us the serial and we confirm the element group before quoting.

5. Where Cross-Reference Lists Go Wrong

Three failure modes cover nearly every wrong delivery: Family-wide lists: a number listed for "320D" may be the 320D2 element, or a compact-equipment element with the same thread. Grade blindness: a cross number says nothing about efficiency — the hydraulic return element on a 320D is a UHE part with synthetic media, and a standard-efficiency substitute is a downgrade that shows up later as a pump repair. Stale numbers: ordering against an invoice rather than the element gets you last generation's part; where a supersession exists, confirm which side of it your machine is on.

The related guides go deeper on each position: the Cat 320D filter guide lists the complete seven-element service set, the Komatsu PC200-8 filter guide does the same for the PC200-8, hydraulic filters: pilot, case drain and return explains the three hydraulic positions, excavator air filters covers the intake side, and fuel filter problems deals with water and dirt. If your cross number is not on our list, run the fake-filter checks before you fit it.

FAQ

Q: How do I cross-reference an excavator filter part number?
A: Match three dimensions first — outside diameter, overall length and thread or seal type — then check the number stamped on the element you removed. Cross-reference lists (Baldwin, Donaldson, Fleetguard, MANN, WIX, Sakura) are a starting point, not a guarantee: the same number can be listed against several machine families, and suppliers quote the same element at slightly different sizes. A quality supplier confirms the fit from your old element photos and machine serial before dispatch.

Q: What are the cross reference numbers for Cat 1R-0739 and 1R-0751?
A: 1R-0739, the engine oil filter for the 320D/320D L/320D GC, cross-references to Baldwin B7600, Donaldson P554004 (P550490 also appears on lists), Fleetguard LF667/LF3730, MANN W11102/14 and Sakura C-5501. It supersedes the older Cat numbers 2P-4004, 1R-0658 and 1W-3300. 1R-0751, the fuel filter for the same family, cross-references to Baldwin BF7632, Donaldson P551315 and Fleetguard FF5324; Cat also lists it as 306-9199.

Q: Why does the same filter number show different dimensions on different sites?
A: Because aftermarket suppliers measure their own production, and published data is not always maintained. Cat 093-7521 is quoted at both 93 mm and 95 mm outside diameter; 5I-8670 appears at 154 mm and 155 mm height; 1R-0739 is listed at 256 mm, 260 mm and 264 mm overall. A few millimetres rarely decides fitment, but the thread, the seal type and the efficiency grade do — which is why we treat any published dimension as a fitment check and confirm against the element you remove.

Q: Can I fit a cheaper cross-referenced filter instead of the OEM element?
A: Yes, if the efficiency grade matches as well as the thread and dimensions. Quality aftermarket elements for Cat 320D and Komatsu PC200-8 numbers typically run 30–60% below OEM list. The mistake is trading grade for price on the elements that protect expensive components — hydraulic pilot, case drain and return elements, and engine oil filters on common-rail engines. Send us the number off your old element and the machine serial and we will quote the correct grade.