WIX Hydraulic Filter 51551 Spin-On 10 Micron

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 1216 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 1216 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 manufacturers 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 manufacturers 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 youre 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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