Fleetguard · HF Hydraulic · inline line
HF28991 filter element: specifications & equivalents
The HF28991 is a Fleetguard inline-line hydraulic filter element, rated at 22 µm absolute (22 µm at β75(c) per ISO 16889). Verify against the current manufacturer data sheet before ordering.
Inside diameter 152.6 mm
Filtration rating 22 µm abs.
Beta rating 22 µm at β75(c) per ISO 16889
Line type inline
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 | inline line |
| Filtration rating | 22 µm |
| Rating basis | absolute |
| Beta ratio | 22 µm at β75(c) per ISO 16889 |
| Inside diameter ID | 152.6 mm |
| Length | 457.2 mm |
| End caps | open-ended cartridge element |
| Integral bypass valve | none (housing/valve-dependent) |
| Manufacturer part no. | HF28991 |
| 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.
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
|
↔ 310213 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 310213 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ 94354 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists 94354 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ C722 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists C722 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ ELP618 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists ELP618 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ LH8787 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists LH8787 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PL6185 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PL6185 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PLW71881 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PLW71881 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ PP6185 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists PP6185 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
| ↔ PT122-5 | Baldwin Filters | partial | Fleetguard's online catalog lists PT1225 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ Q6185 page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists Q6185 as an interchange for HF28991. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting. |
|
↔ Q6185X page in verification queue | Aftermarket | partial | Fleetguard's online catalog lists Q6185X as an interchange for HF28991. 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 HF28991 model number is decoded
- HF28991Fleetguard HF-series hydraulic cartridge element part number.
- 457.2 mmOverall height.
- 152.6 mmLargest end inside diameter.
- 22 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
- “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 micron rating does HF28991 use?
This element is rated 22 µm absolute — 22 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 HF28991 filter element?
11 partial match(es) requiring parameter review
How do I read the HF28991 part number?
See the designation decoder above: each segment of HF28991 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.