WIX Hydraulic Filter 51551 – Spin-On 10 Micron
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WIX Hydraulic Filter 51551 – Spin-On 10 Micron
The WIX 51551 is a heavy-duty, full-flow spin-on hydraulic filter designed to control contamination in compatible hydraulic systems. It uses enhanced-cellulose media with a nominal 10-micron rating and supports a rated flow range of approximately 12–16 gallons per minute.
Although it is sometimes listed as an oil filter, WIX classifies part 51551 as a hydraulic-service filter, not a conventional engine-lubrication filter. Its corrosion-resistant construction, attached sealing gasket, and 440 psi burst-pressure rating suit demanding equipment and machinery applications.
Key Features
- Full-flow spin-on hydraulic filter
- Enhanced-cellulose filtration media
- Nominal filtration rating: 10 microns
- Rated flow range: approximately 12–16 GPM
- Thread size: 1"-12
- Height: approximately 5.209 in / 132 mm
- Outside diameter: approximately 3.663 in / 93 mm
- Attached gasket OD: approximately 2.729 in / 69 mm
- Attached gasket ID: approximately 2.415 in / 61 mm
- Burst-pressure rating: 440 psi
- Beta ratio: 2/20/75 = 5/13/18
- No internal bypass valve
- No anti-drainback valve
- UPC/GTIN: 765809515512
Application Compatibility
WIX identifies the 51551 for various hydraulic applications requiring a 10-micron, full-flow spin-on filter with a 1"-12 mounting thread. Catalogue references associate it with select hydraulic systems used in equipment from Bobcat, Case IH, Caterpillar, Hyster, Ingersoll-Rand, John Deere, JLG, Kubota, Massey Ferguson, Sullair, Terex, and Yale, among others.
Some WIX catalogue applications include Bobcat 631 and 641 equipment using the Deutz F2L 511 engine; however, the 51551 is listed there for hydraulic filtration, not engine-oil filtration.
Fitment Notice
Confirm the number on the existing hydraulic filter or verify the filter-head specification before ordering. The mounting thread, gasket dimensions, micron rating, flow capacity, and system pressure requirements must all match. Do not install the WIX 51551 as an engine-oil filter solely because its physical dimensions or thread appear compatible — this filter has no internal bypass or anti-drainback valve and is engineered for specified hydraulic applications.
When to Replace
Replace the hydraulic filter at the equipment manufacturer’s recommended service interval, or sooner when operating in dirty, wet, or high-load conditions. Replacement is also required when hydraulic fluid is changed, after a pump, cylinder, motor, or control valve failure, when contamination has entered the system, when hydraulic operation becomes slow or erratic, when the filter housing is dented, corroded, or leaking, or when a filter-restriction indicator signals excessive pressure differential. Always replace after major hydraulic repairs to prevent residual debris from circulating through newly installed components.
Installation Notes
Clean the filter head and surrounding area before removing the existing filter. Confirm the old gasket has been removed from the mounting surface. Lightly lubricate the new gasket with clean, system-compatible hydraulic fluid and install by hand to the manufacturer’s tightening specification — do not overtighten. After installation: restore the hydraulic fluid level, operate the system at low pressure, inspect for leakage, cycle hydraulic functions to remove trapped air, then recheck fluid level and filter after the system reaches operating temperature.
Cross-Reference Numbers
- Donaldson P551551
- Baldwin BT839-10 / B958
- Fleetguard HF6056 / HF6121 / HF6505
- FRAM P1653A
- Mann W940/38
- Hastings HF731
- Parker RH-20-10C
- CARQUEST 85551
- NAPA 1551
Related WIX filtration options: WIX 51552 (approx. 20-micron) and WIX 51553 (approx. 33-micron) — not automatic direct substitutes; always match the required micron rating and hydraulic-system specification.
Other WIX Filters
- WIX Oil Filter 51806
- WIX Oil Filter 51629 – Lister/Petter
- WIX Oil Filter 51061 – GM Tall
- WIX Oil Filter 51083
- WIX Oil Filter 51361
- WIX Oil Filter 51365
- WIX Oil Filter 51515 – Ford
Parts Desk Insights
The important detail with the WIX 51551 is that it is a hydraulic filter, even though it may be described simply as an oil filter in older inventory systems. Matching the filter-head thread is not enough — the 10-micron rating, flow capacity, and lack of an internal bypass valve must also suit the hydraulic system. If you’re unsure whether this is the right filter for your application, have the equipment make, model, and existing filter part number ready when contacting us.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.