Hydraulic Filter Cross Reference Chart (2026)

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⚡ Quick Answer:

Unlike engine oil filters, Kubota hydraulic and HST/transmission filters don’t have an established Baldwin/WIX/Donaldson/FRAM/NAPA cross-reference ecosystem. The safest path is ordering the genuine Kubota part number for your exact model. Many models also use two separate filters for one hydraulic system — a suction/inlet strainer and a separate spin-on pressure filter — so don’t assume one number covers the whole system. This guide gives you verified OEM part numbers by model, sourced from Kubota parts diagrams and dealer catalogs.

⚠️ Correction notice: An earlier version of this guide listed several oil and air filter part numbers as hydraulic filter cross-references, and paired hydraulic filters with unrelated automotive lube-filter brands. This page has been rebuilt with verified Kubota OEM part numbers, separated correctly by system.

Kubota hydraulic and HST filters get confused with engine oil filters more often than any other part on the tractor — the part numbers often look similar, and many online listings bundle all three (oil, hydraulic, HST) into one “compatible with” list without distinguishing them. Ordering the wrong one won’t just waste money; a hydraulic filter and an oil filter are built for different pressures and fluids, and using the wrong part can damage your system. This guide keeps the systems separated.

🔧 Three Different Filter Systems on One Tractor

Engine oil filter — filters engine lubricant only, completely separate from the rest
HST/transmission filter — filters the hydrostatic drive circuit, usually a spin-on canister
Hydraulic filter — filters the implement/loader hydraulic circuit; some models use a suction/inlet strainer (cleaned or OEM-replaced, not swapped for a generic aftermarket part) in addition to or instead of a spin-on filter

Kubota HST tractors typically share one fluid reservoir between transmission and hydraulics, but that does NOT mean they share one filter — these are always separate physical parts, even when the numbering looks related.

BX Series — HHK20-36990

BX1880, BX2380, BX2680 use HHK20-36990 as the HST/transmission spin-on filter. These models also use a separate hydraulic suction/inlet strainer, K2581-36520 — this is a mesh screen, typically cleaned rather than replaced with an aftermarket part; treat it as an OEM/dealer-only item.

🛒 BX Series HST Filter

HHK20-36990 — HST/Transmission Filter

BX1880, BX2380, BX2680

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B Series — HH6F0-36060 / HH6C0-37710

B2301, B2601, B2650 use two separate filters: HH6F0-36060 for the HST/transmission circuit (this is the current part number — it supersedes the older HH660-36060, which is still sometimes listed but has been replaced in current Kubota catalogs), and HH6C0-37710 for the hydraulic circuit (supersedes older HH670-37710/HH670-37712).

We were not able to confirm an established name-brand (Baldwin/WIX/Donaldson) aftermarket cross-reference for these two parts. If you’re ordering online, search the exact Kubota part number — several manufacturers sell direct-replacement filters under the Kubota number itself rather than a separate brand code.

L Series HST — HHK70-14073 / HH3A0-82623

L2501 HST, L3301 HST, L3901 HST use HHK70-14073 as the HST/transmission spin-on filter (current number — supersedes the older HHK70-14070), plus a separate hydraulic suction/inlet strainer, HH3A0-82623. Like the BX-series strainer, this is typically cleaned rather than aftermarket-replaced.

🛒 L Series HST Filter

HHK70-14073 — HST/Transmission Filter

L2501 HST, L3301 HST, L3901 HST

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M Series — HHTA0-37710

M5040, M6040, M7040, M5-111, M6060, M7060 use HHTA0-37710 as the hydraulic spin-on filter. On M7040 and M6040, some parts references also list a separate suction/inlet filter, HH3A0-82623 — the same part shared with the L2501/L3301/L3901 hydraulic suction circuit.

We could not confirm the exact hydraulic/HST filter for M6-141, L4701, or L5740 from an authoritative source at time of writing — for those models, verify against your operator’s manual or a genuine Kubota parts diagram rather than guessing from a generic “fits” listing.

Why no name-brand cross-reference table?

Engine oil filters have a mature aftermarket — Baldwin, WIX, Donaldson, FRAM, and NAPA Gold all publish official cross-references you can verify. Kubota’s ag hydraulic and HST filters largely don’t have that same ecosystem. The realistic aftermarket option is a direct-replacement filter sold under the same Kubota part number by a generic manufacturer — we can’t independently verify the build quality of those sellers, so we’re not recommending specific ones here. When in doubt, the genuine Kubota part is the safest choice for a system that runs under real pressure.

How to Change a Hydraulic or HST Filter Correctly

Relieve system pressure — shut the engine off, cycle loader and 3-point controls through their full range several times to dump residual pressure.

Confirm which filter you’re changing — HST/transmission filters are usually near the transmission housing; hydraulic filters near the pump. Don’t assume — check your manual’s diagram.

Position a drain pan and remove the old filter with a strap wrench, turning counterclockwise.

Clean the mounting base and confirm the old gasket came off with the filter — double-gasketing is the most common cause of leaks.

Pre-fill the new filter with clean fluid where possible, and lightly oil the gasket before installing.

Hand-tighten until the gasket seats, then a further 3/4 turn — never use a wrench for final tightening.

Top off fluid, run the engine briefly, then shut down and check for leaks around the filter base before putting the tractor back to work.

⚠️ Warning: If a suction/inlet strainer requires servicing, never substitute an unverified generic filter for the genuine Kubota part — a poor seal on the suction side can starve the pump and cause serious damage.

Troubleshooting Hydraulic Filter Issues

System running hot — a clogged filter restricts flow, forcing the pump to work harder.
Loss of hydraulic power — slow loader raise, weak steering, or sluggish HST response; often improves right after a filter change.
Noisy pump (cavitation) — whining or growling usually points to a starved suction side — check the inlet strainer.
Fluid contamination — metallic glitter or milky fluid may require a full system flush. See our hydraulic contamination and flush guide.

If your loader drifts down after a filter or fluid change, see the Kubota loader drift troubleshooting guide.

Kubota hydraulic and HST filters are best ordered by genuine part number rather than chasing a name-brand cross-reference that often doesn’t exist for these parts. Confirm your exact model and serial range against your operator’s manual before ordering, since Kubota supersedes part numbers over time and similar-looking models can use different filters. For engine oil filter cross-references, see our Tractor Oil Filter Cross-Reference Guide. For more DIY guides visit TractorPartsCentral.com.

? Frequently Asked Questions

Are Kubota hydraulic and HST filters the same as the engine oil filter?

No. Even though part numbers can look similar, engine oil, hydraulic, and HST/transmission filters are always separate physical parts on Kubota HST tractors. Mixing them up is a common and costly mistake — always confirm the exact part number and its stated function before ordering.

Why isn’t there a Baldwin/WIX/Donaldson cross-reference for my hydraulic filter?

Unlike engine oil filters, Kubota’s ag hydraulic and HST filters largely don’t have an established major-brand aftermarket ecosystem. The realistic alternative is a direct-replacement filter sold under the same Kubota part number by a generic manufacturer, rather than a name-brand cross-reference. Genuine Kubota parts remain the most reliably verified option.

My model isn’t listed — what should I do?

Check your operator’s manual or a genuine Kubota parts diagram for your exact model and serial number rather than assuming a similar-looking model’s part number applies. Kubota supersedes part numbers over time, and models within the same series can use different filters.

Can I clean a hydraulic suction strainer instead of replacing it?

Often, yes — suction/inlet strainers on models like the BX and L series are typically metal mesh screens designed to be cleaned during routine service rather than swapped for a generic aftermarket part. Check your operator’s manual for the correct cleaning interval and procedure.

Related Kubota Hydraulic & Filter Guides

Kubota Filter Cross-Reference Master Chart →

All Kubota filter part numbers in one place

Kubota Hydraulic Fluid Change Guide →

Step-by-step fluid change procedure

Kubota Transmission Fluid Change Guide →

Full drain, filter, and refill procedure

Tractor Oil Filter Cross-Reference Guide →

Verified Baldwin, WIX, FRAM, NAPA equivalents

Kubota Loader Drift Troubleshooting →

Diagnose slow loader lift or drift after service

Hydraulic Fluid Contamination Flush Guide →

Full system flush for contaminated fluid

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