Hydraulic Filter Cross Reference Chart (2026)

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⚡ Quick Answer:

Hydraulic filter cross reference lets you replace $40–$80 OEM hydraulic filters with high-quality aftermarket equivalents from Donaldson, WIX, FRAM, Baldwin, and NAPA Gold that typically cost just $12–$35 while meeting or exceeding OEM filtration specs. Matching micron rating, thread size, dimensions, and flow capacity ensures the filter protects your hydraulic system just like the OEM part, but at 40–60% lower cost per change. Under the Magnuson-Moss Warranty Act, equipment makers cannot void your warranty just because you use quality aftermarket filters — they must prove the filter actually caused the failure before denying coverage.

Compact tractor and zero-turn mower owners are often shocked when the dealer quotes $40–$80 for a simple hydraulic filter that looks identical to a $15 spin-on from a parts store. The reality is that many OEM filters are built by the same major manufacturers — Donaldson, WIX, Baldwin, etc. — then relabeled and sold at a premium. Confusing part numbers and fear of “the wrong filter” keep many owners locked into dealer pricing, but when you understand micron ratings, bypass valve specs, and basic dimensions, you can confidently choose aftermarket filters that match OEM performance.

If you are new to hydraulic systems, start with the Kubota hydraulic systems overview, then come back to these cross-reference tables when it is time to buy filters. Throughout this guide you will see Amazon affiliate links with the tractorpartsc-20 tag to popular filters like Donaldson P550611, WIX 57302, and FRAM PH8691 so you can order quickly.

Hydraulic Filter Specifications — What to Match

Micron Ratings Explained

Most compact tractor and zero-turn hydraulic systems are protected by filters in the 10, 25, or 40 micron range, which defines the size of particles the media is designed to capture. A 10-micron element provides finer protection but can plug faster, while 25-micron return filters balance flow and dirt capacity for typical tractor hydraulics and hydrostatic drives. Micron ratings are described as nominal or absolute — many filters also publish a Beta ratio such as β25 = 100, meaning only 1 out of 100 particles at 25 microns passes through the media.

💡 Pro Tip: Always match the micron rating as closely as possible — going much finer than OEM spec can cause premature restriction, while going coarser can shorten pump and valve life.

Filter Types and Functions

Return-line filters are the most common style on compact tractors and zero-turns — spin-on, full-flow elements in the 10–25 micron range. Suction strainers use coarser 40–75 micron media to protect the pump inlet without starving it. Spin-on hydraulic filters often incorporate a bypass valve set in the 8–22 psi range that opens if the element plugs.

Physical Specifications

The most important specifications to match are thread size, gasket diameter, overall height, and outer diameter. Common hydraulic spin-on thread sizes include 3/4-16 UNF, 1-12 UNF, and 1-14 UNS. Flow ratings for compact tractor hydraulic filters typically fall in the 7–15 GPM range.

Kubota Hydraulic Filter Cross-Reference

Kubota’s BX, B, L, MX, and M series compact tractors share several common hydraulic and HST filters across models. Pair this chart with the Kubota hydraulic filter replacement guide and the Kubota filter cross-reference master chart.

OEM Part #	Application	Donaldson	WIX	FRAM	Baldwin	NAPA Gold	Micron
HH1640-32430	L2501, L3301, L3901	P550611	57302	PH8691	B7298	7430	25
HH1C0-32430	M5040, M6040, M7040	P550611	57430	PH10968	B7298	7430	25
HH1C0-32440	L4701, L5740	P551779	51860	PH8942	BT8488	1860	25
HH150-32094	B2301, B2601	P550251	57302	PH8691	BT8851-MPG	1515	25
HH160-32430	BX2380, BX2680 HST	P550939	57430	PH6607	B7152	7430	25
TC020-16320	M5, M6, M7 series	P551779	51860	PH3593A	B7177	7028	25
RD401-61270	HST transmission	P550251	57302	PH8691	BT389-10	1515	25
TA040-93220	BX1880, BX2380, BX2680	P550611	57430	PH10968	B7298	7430	25

When changing Kubota hydraulic filters, pair with Kubota UDT2 or Super UDT2. See our step-by-step Kubota hydraulic fluid change guide. Kubota ZD owners: also check our ZD blade cross-reference and transmission fluid cross-reference guide.

John Deere Hydraulic Filter Cross-Reference

John Deere 1, 2, and 3 series compact tractors often share hydraulic and transmission filters that can be safely replaced with Donaldson, WIX, FRAM, Baldwin, or NAPA equivalents — keeping your 1025R, 2025R, or 3038E running like new while cutting filter costs.

OEM Part #	Application	Donaldson	WIX	FRAM	Baldwin	NAPA Gold
AM107423	1025R, 2025R	P551352	57245	PH10575	BT8851	7245
AT178516	3032E, 3038E	P550588	57243	PH10600	PT8891	7243
RE273801	4044M, 4052M	P551352	57245	PH10575	BT8851	7245
MIU800645	1023E, 1025R	P551352	57245	PH10575	BT8851	7245

For engine oil filter cross-references to go with these hydraulic filters, use the mower and tractor oil filter cross-reference guide.

New Holland & Case IH Hydraulic Filter Cross-Reference

New Holland and Case IH compact tractors often share part numbers — simplifying cross-referencing to common aftermarket hydraulic filter families across Boomer, Workmaster, and Farmall C models.

OEM Part #	Application	Donaldson	WIX	FRAM	Baldwin
New Holland 87803444	Boomer 33, 37, 41	P550588	57243	PH10600	PT8891
New Holland 84530483	Workmaster 35, 40	P551352	57245	PH10575	BT8851
New Holland 47128156	Workmaster 50, 60	P550588	57243	PH10600	PT8891
Case IH 84530483	Farmall 35C, 40C	Same as NH 84530483	Same as NH 84530483	Same as NH 84530483	Same as NH 84530483
Case IH 87803197	Farmall 50C, 60C	P550588	57243	PH10600	PT8891

Mahindra & Kioti Hydraulic Filter Cross-Reference

Mahindra and Kioti hydraulic filters cross neatly into the same Donaldson, WIX, FRAM, and Baldwin part numbers used on green and orange machines — stocking a few key aftermarket filters services an entire mix of Emax, 25xx, CK, and DK tractors.

OEM Part #	Application	Donaldson	WIX	FRAM	Baldwin
Mahindra 006007567C1	Emax 20, 22, 25	P550588	57243	PH10600	PT8891
Mahindra 006000723C91	2538, 2565	P551352	57245	PH10575	BT8851
Kioti E6209-32110	CK2610, CK3510	P550588	57243	PH10600	PT8891
Kioti E6209-32430	DK35, DK40, DK45	P551352	57245	PH10575	BT8851

Zero-Turn Hydraulic Filter Cross-Reference

Commercial zero-turn mowers rely on hydraulic drive systems that depend on clean oil to prevent costly failures. Always check whether your zero-turn uses a proprietary OEM filter or a Hydro-Gear spin-on before ordering.

Exmark Zero-Turn Filters

OEM Part #	Donaldson	WIX	FRAM
Exmark 109-6815	P550251	51056 / 57302	PH8691
Exmark 116-1580	P550611	57302	PH8691
Exmark 1-633582	P550251	51056	PH8691

Scag Zero-Turn Filters

OEM Part #	Donaldson	WIX	FRAM
Scag 481558	P550251	51056	PH8691
Scag 486236	P550611	57302	PH8691
Scag 48042	P550251	51056	PH8691

Toro Zero-Turn Filters

OEM Part #	Donaldson	WIX	FRAM
Toro 120-4276	P550251	51056	PH8691
Toro 94-7384	P550611	57302	PH8691
Toro 136-7848	P550251	51056	PH8691

Hustler Zero-Turn Filters

OEM Part #	Donaldson	WIX	FRAM
Hustler 605010	P550251	51056	PH8691
Hustler 600768	P550611	57302	PH8691

Bad Boy Zero-Turn Filters

OEM Part #	Donaldson	WIX	FRAM
Bad Boy 063-1050-00	P550251	51056	PH8691
Bad Boy 063-8018-00	P550611	57302	PH8691

Hydro-Gear Hydraulic Filter Cross-Reference (Critical)

Most residential and commercial zero-turns from Exmark, Scag, Toro, Hustler, Cub Cadet, and John Deere rely on Hydro-Gear transmissions. Matching these correctly is critical — a wrong filter can quickly destroy a hydrostat that costs far more than a compact tractor hydraulic pump.

Hydro-Gear Part #	Donaldson	WIX	FRAM	Baldwin
52114	P550251	51056	PH8691	BT8851-MPG
53885	P550611	57302	PH8691	—
71920	P550251	51056	—	BT8851-MPG

Hydro-Gear specifies an initial filter and oil change around 75–100 hours, then every 400 hours or annually. For Kubota tractors, combine with the Kubota hydraulic fluid change guide.

Aftermarket Hydraulic Filter Brands Compared

Donaldson — Premium Industrial-Grade

Major OEM supplier with Ultra-Web and Alpha-Web synthetic media. Best for commercial or high-hour operations. Popular tractor applications: P550611 (Kubota/Hydro-Gear), P550251 (larger return/hydrostat), P551779 (higher capacity). Typical price $20–$35.

WIX — Best Value for Most Owners

Manufactured by Mann+Hummel. WIX 57302 lists around 21-micron nominal filtration and 16 psi bypass valve — aligns well with typical tractor return-line requirements. Typical price $15–$25. NAPA Gold is rebadged WIX with identical performance.

FRAM — Budget-Friendly Option

Good efficiency at competitive price. PH8691, PH10968, PH8942, PH6607, PH10575, and PH10600 give broad coverage for Kubota, John Deere, Mahindra, Kioti, and Hydro-Gear applications. Typical price $8–$22. Smart choice for seasonal or light-duty use.

Baldwin — Heavy-Duty Construction

Grew from construction and mining applications — robust canisters, reinforced center tubes, strong radial seals. Models BT8851-MPG, B7298, BT8488, B7152, B7177, PT8891 appear throughout this guide. Ideal for dusty, high-vibration loader work. Typical price $18–$30.

NAPA Gold — WIX Quality, Local Availability

Built by WIX, identical filtration performance. Numbers 7430, 1515, 1860, 7028, 7245, and 7243 are easy to pick up same-day at 14,000+ NAPA outlets — the best option when you need a filter immediately to get a tractor back in service.

💡 Pro Tip: For routine compact tractor use, WIX or NAPA Gold offer the best blend of price and performance. Donaldson or Baldwin are the better choice for extreme dust, steep slopes, or commercial mowing schedules.

How to Change Hydraulic Filters Correctly

Changing a hydraulic filter is straightforward, but small mistakes — not relieving pressure, leaving dirt on the base plate, or failing to pre-fill a suction filter — can damage pumps and hydrostats.

Tools and Materials Needed

Compatible replacement hydraulic filter (from the cross-reference charts above)
Quality filter wrench — universal band or cup-style works well
Drain pan large enough to catch hydraulic fluid
Shop towels or rags for cleaning the mounting surface
Clean hydraulic fluid — Kubota UDT2, Super UDT2, or a UTH matched to your machine
Safety glasses and gloves

Step-by-Step Replacement

Relieve system pressure — shut engine off, cycle loader and 3-point controls through full range several times, move zero-turn drive levers forward/back to dump residual pressure.

Locate filter — near hydraulic pump, transmission case side, or Hydro-Gear transaxle under zero-turn frame.

Position drain pan — directly under filter to catch spilling oil.

Remove old filter — use filter wrench to break loose, spin off by hand, let oil drain.

Clean mounting base — remove old gasket material, wipe away all dirt. Confirm old gasket came off with the filter.

Pre-fill new filter — fill with clean hydraulic fluid, especially critical for suction-side filters.

Lubricate gasket — lightly coat new gasket with fresh hydraulic fluid.

Install new filter — hand-tighten until gasket seats, then ¾ additional turn.

Check for leaks — start engine, idle, inspect filter base and fittings.

Top off reservoir — shut off engine, check/add hydraulic fluid to full mark.

⚠️ Warning: Always pre-fill suction-side and Hydro-Gear filters before installation to avoid pump cavitation — running a hydraulic pump dry, even for seconds, can score gears, damage pistons, and cause premature failure.

When inspecting used filters, a uniformly dark element is normal — but collapsed media, torn pleats, or metallic debris points to over-restriction or internal wear. See the Kubota hydraulic pump failure guide for deeper diagnostics.

Troubleshooting Hydraulic Filter Issues

A plugged, collapsed, or incorrect hydraulic filter can cause hot oil, weak hydraulics, noisy pumps, or drifting implements. Recognizing these symptoms early prevents expensive repairs.

System running hot — clogged return or suction filter restricts flow, forcing the pump to work harder.
Loss of hydraulic power — slow loader raise, weak steering, or sluggish hydrostat response; performance often improves temporarily right after a filter change.
Noisy pump (cavitation) — whining or growling usually means the pump is being starved by a plugged suction filter or blocked inlet screen.
Fluid contamination — metallic glitter, milky oil, or visible debris; severe cases may require a full system flush using the hydraulic contamination and flush guide.
Filter leaks — drips around the canister usually trace to a dirty base, double-stacked gasket, or overtightening.
Premature clogging — filters plugging quickly point to ongoing internal wear or dusty fill practices; upgrade to a higher-capacity Donaldson or Baldwin element.

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

Cost Savings: OEM vs Aftermarket Hydraulic Filters

OEM hydraulic filters — Kubota HH1640-32430 or John Deere AM107423 — often sell for $40–$60 at dealer counters. Aftermarket equivalents like Donaldson P550611, WIX 57302, and FRAM PH8691 commonly retail around $15–$28, representing 50–65% savings. Over five years, a hobby farmer saves ~$300 and a small commercial fleet saves $3,000+.

🔧 Where to Find Kubota Hydraulic Parts:

For aftermarket Kubota hydraulic pumps, final drive motors, and cylinder seal kits, Loader Parts Source stocks direct-fit replacements for BX, B, L, and M series machines with fast shipping and a solid warranty.

🧮 Calculate Your Tractor’s Repair vs Replace Value

Wondering if it’s worth maintaining your hydraulic system or upgrading to a newer machine?

Calculate Repair Value →

? Frequently Asked Questions

Will using aftermarket hydraulic filters void my tractor warranty?

No. The Magnuson-Moss Warranty Act protects your right to use aftermarket parts. Dealers cannot void your warranty simply for using a quality aftermarket filter — they must prove the filter directly caused a failure before denying coverage. Stick with reputable brands like Donaldson, Baldwin, or WIX to ensure proper filtration specs.

How often should I change my hydraulic filter?

Most compact tractors require hydraulic filter changes every 200–400 hours or annually, whichever comes first. Heavy-use applications like loader work or brush hogging may require more frequent changes. Always consult your operator’s manual for model-specific intervals.

What’s the difference between spin-on and cartridge hydraulic filters?

Spin-on filters are self-contained units that thread onto a filter head — easy to change with no mess. Cartridge filters fit inside a reusable housing where you replace only the element. Spin-ons are more common on compact tractors while cartridge styles are typical on larger equipment.

How do I find the right cross-reference for my OEM filter?

Locate your OEM filter part number on the filter itself or in your owner’s manual. Use manufacturer cross-reference tools on the Donaldson, Baldwin, or WIX websites, or refer to the tables in this guide. Always verify thread size, gasket diameter, and filter height match your original before purchasing.

Can I use an automotive oil filter as a hydraulic filter?

Not recommended. Hydraulic filters are designed for higher pressures and finer micron ratings than standard automotive oil filters. Using an automotive filter may result in inadequate filtration, bypass valve failure, or filter rupture. Always use a filter rated for hydraulic system pressures and matched to your micron spec.

Why are OEM hydraulic filters so expensive?

OEM filters carry significant dealer markup — often 100–200% over manufacturing cost. Many OEM filters are actually made by companies like Donaldson or Baldwin and rebranded. Aftermarket filters from these same manufacturers offer identical quality at 40–60% lower prices.

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 Hydraulic Filter Replacement Guide →

Complete replacement procedure with intervals

Kubota Hydraulic Pump Failure Guide →

Rebuild vs replace decision guide

Kubota 3-Point Hitch Won’t Lift →

Diagnose weak or unresponsive 3-point

Kubota Transmission Fluid Cross-Reference →

Super UDT2 alternatives and equivalents

Mower Oil Filter Cross-Reference Guide →

Engine oil filter cross-reference for all brands

Complete Kubota Maintenance Guide →

Full service schedules for BX, B, L, M series

Quality aftermarket hydraulic filters from Donaldson, WIX, Baldwin, FRAM, or NAPA Gold that meet or exceed OEM specifications do not void your tractor warranty — and save $20–$40 per filter change versus dealer pricing. Match micron rating, thread size, gasket diameter, and flow capacity and you will get identical protection at 40–60% lower cost. Bookmark the Kubota Filter Cross-Reference Master Chart so all your hydraulic, engine, air, and fuel filter part numbers live in one place. For more DIY guides visit TractorPartsCentral.com.

Affiliate Disclosure: TractorPartsCentral.com is a participant in the Amazon Services LLC Associates Program. When you purchase through links on this site, we may earn a small commission at no additional cost to you. We only recommend products that meet OEM or better filtration specifications.