Fleetguard · HF Hydraulic · return line
HF7551 filter element: specifications & equivalents
The HF7551 is a Fleetguard return-line hydraulic filter element, sized 96.5 × 136.7 mm OD × length, rated at 25 µm absolute (25 µm at β75(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Envelope OD × L 96.5 × 136.7 mm
Filtration rating 25 µm abs.
Beta rating 25 µm at β75(c) per ISO 16889
Line type return
Catalog verified. Parameters extracted from the manufacturer’s electronic
catalog / official interchange document and checked 2026-09-28. Confidence score 0.90.
Specifications and cross-references are taken from the Fleetguard online catalog API. Where both TWA and Beta ratings are published the conventions differ — verify cleanliness targets, collapse rating and seal configuration against the current Fleetguard data sheet before ordering.
Specification table
| Parameter | Value |
|---|---|
| Filter type | return line |
| Filtration rating | 25 µm |
| Rating basis | absolute |
| Beta ratio | 25 µm at β75(c) per ISO 16889 |
| Outside diameter OD | 96.5 mm |
| Length | 136.7 mm |
| End caps | spin-on baseplate with attached gasket |
| Flow direction | outside-in |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF7551 |
| Source catalog | Cummins Filtration / Fleetguard: Fleetguard online product catalog (fleetguard.com) |
| Last verified | 2026-09-28 |
Sources: Cummins Filtration / Fleetguard — Fleetguard online product catalog (fleetguard.com) — accessed 2026-09-28.
Fleetguard® and all model designations are trademarks of their respective owners, used here for identification only — ElementRef is an independent reference site, not an authorized Fleetguard distributor.
Dimensions & series range
| Outside diameter | 96.5 mm (3.799 in) |
| Overall length | 136.7 mm (5.382 in) |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 104200830 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 104200830 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 150794A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 150794A as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 156051527200 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 156051527200 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3177754 page in verification queue | UFI | partial | Fleetguard's online catalog lists 3177754 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 3270137950 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 3270137950 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 332B1489 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 332B1489 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 332B7467 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 332B7467 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4070100400 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4070100400 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 4070134110 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 4070134110 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 50005302 page in verification queue | UFI | partial | Fleetguard's online catalog lists 50005302 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 557440 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 557440 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 57440 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 57440 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 6636137950 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 6636137950 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 6884162280 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 6884162280 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 72953681 page in verification queue | UFI | partial | Fleetguard's online catalog lists 72953681 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 7440 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 7440 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 84440 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 84440 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ BT334 | Baldwin Filters | partial | Fleetguard's online catalog lists BT334 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ C120 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists C120 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ CF0608 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists CF0608 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ DHE26 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists DHE26 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ F91521 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists F91521 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ FJX2017 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists FJX2017 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ GP317H page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists GP317H as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0755100 page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0755100 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ HF0755100JX page in verification queue | Fleetguard | partial | Fleetguard's online catalog lists HF0755100JX as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ KNJ0228A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists KNJ0228A as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ KNJ0288 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists KNJ0288 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ KNJ0288A page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists KNJ0288A as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LFH7551 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LFH7551 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PA33H01040P1 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PA33H01040P1 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PT9396 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PT9396 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ RJ641X page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists RJ641X as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ SPH9213 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists SPH9213 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ VOE104200830 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists VOE104200830 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ WD10004 | MANN-FILTER | partial | MANN-FILTER's online catalog lists HF7551 (FLEETGUARD/CUMMINS FILTRATION) as a comparison number for WD10004. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ Z766611330 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists Z766611330 as an interchange for HF7551. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
Interchange levels: full catalog-confirmed drop-in · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the HF7551 model number is decoded
- HF7551Fleetguard HF-series hydraulic spin-on filter part number.
- 136.7 mmOverall height.
- 96.5 mmLargest outside diameter.
- 25 µm at β75(c) per ISO 16889Published efficiency ratings.
Typical equipment & applications
- Construction, agricultural and industrial hydraulic circuits
- Mobile-equipment hydraulic return and pressure lines
Selection pitfalls — read before you substitute
- A return-line element is not a pressure-line element: return cartridges (BN4HC low-collapse) tolerate roughly 20 bar differential, while BH4HC pressure executions are rated to 210 bar. Installing a low-collapse element in a pressure housing can rupture the media on cold-start spikes.
- This element has no integral bypass — opening pressure is set by the housing’s reusable bypass valve. Confirm the valve setting (commonly 3.4 bar) is present before fitting.
- “10 µm nominal” and “12 µm at β1000” can describe the very same media — one is reported at β≥200, the other at β≥1000 per ISO 16889. Compare ratings at the same Beta test point, not just the printed micron number.
- Nitrile (NBR) seals are standard for mineral hydraulic oil but fail early in some phosphate-ester fluids and at sustained high temperature; verify seal compound against the fluid data sheet (fluorocarbon/Viton executions may be required).
- End-cap geometry and the number/position of O-rings block interchange even when OD and length match — visually compare end caps before fitting, especially with aftermarket cartridges.
Frequently asked questions
What are the dimensions of the HF7551 filter element?
The published envelope is 96.5 mm OD × 136.7 mm length (3.799 × 5.382 in). Confirm against the housing drawing before ordering.
What micron rating does HF7551 use?
This element is rated 25 µm absolute — 25 µm at β75(c) per ISO 16889. Always compare Beta ratings at the same test point: two brands may print different micron numbers for the same physical grade.
What replaces the HF7551 filter element?
37 partial match(es) requiring parameter review
How do I read the HF7551 part number?
See the designation decoder above: each segment of HF7551 encodes size, line type, filtration grade and media/collapse execution.
Is a same-envelope aftermarket element always a drop-in replacement?
No. Matching OD and length only proves the cartridge fits the bowl. End-cap style, seal compound, micron/Beta rating, collapse pressure and bypass configuration must also match; the table above tags every equivalent as full, partial or verify for exactly this reason.
How often should a hydraulic return-line element be replaced?
Replace at the housing manufacturer’s recommended differential-pressure setting (commonly signalled by a clogging indicator), or on a time-based service interval when no indicator is fitted — never wait for bypass to open continuously, because unfiltered oil then reaches the valves.
Other models in the HF Hydraulic series
All 2621 →Reviewed & verified by the ElementRef engineering desk against Cummins Filtration / Fleetguard on 2026-09-28. Read our editorial & correction policy.