Fleetguard · HF Hydraulic · inline line

HF6091 filter element: specifications & equivalents

The HF6091 is a Fleetguard inline-line hydraulic filter element. Verify against the current manufacturer data sheet before ordering.

Inside diameter 66.67 mm

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
Inside diameter ID	66.67 mm
Length	122.17 mm
End caps	open-ended cartridge element
Integral bypass valve	none (housing/valve-dependent)
Manufacturer part no.	HF6091
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
↔ 1421 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1421 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 1517 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 1517 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 185531H1 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 185531H1 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2022 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 2022 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 2027 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 2027 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 32212 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 32212 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 35P3109 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 35P3109 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3801855311 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3801855311 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 3I1661 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 3I1661 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 422 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 422 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4603833 page in verification queue	UFI	partial	Fleetguard's online catalog lists 4603833 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 4994459 page in verification queue	UFI	partial	Fleetguard's online catalog lists 4994459 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 49944592 page in verification queue	UFI	partial	Fleetguard's online catalog lists 49944592 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 50000 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 50000 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 51000 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 51000 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 51421	WIX Filters	partial	Fleetguard's online catalog lists 51421 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 514903301 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 514903301 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 51517	WIX Filters	partial	Fleetguard's online catalog lists 51517 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 5292065110 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 5292065110 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 5292065125 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 5292065125 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 5292065140 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 5292065140 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 5292067110 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 5292067110 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 54000 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 54000 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 551421 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 551421 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 610815 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 610815 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6438593 page in verification queue	UFI	partial	Fleetguard's online catalog lists 6438593 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6438594 page in verification queue	UFI	partial	Fleetguard's online catalog lists 6438594 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 6438595 page in verification queue	UFI	partial	Fleetguard's online catalog lists 6438595 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 692823 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 692823 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 74994459 page in verification queue	UFI	partial	Fleetguard's online catalog lists 74994459 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 840 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 840 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 841 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 841 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 85421 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 85421 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 85517 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 85517 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 883156C91 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 883156C91 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 884879C1 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 884879C1 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 92152317 page in verification queue	UFI	partial	Fleetguard's online catalog lists 92152317 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 92421 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 92421 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 92517 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 92517 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ 96366 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists 96366 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ A32212 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists A32212 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ C1679 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists C1679 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ C7035 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists C7035 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ CW517MP page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists CW517MP as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ D31423 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists D31423 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ D32212 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists D32212 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ D32254 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists D32254 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ D51411 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists D51411 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ FH28 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists FH28 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ FH4 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists FH4 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ H36035 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists H36035 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ H7008X page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists H7008X as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HEM6076 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists HEM6076 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF0609100 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF0609100 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF0609100JX page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF0609100JX as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ HF726 page in verification queue	Fleetguard	partial	Fleetguard's online catalog lists HF726 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ L1517 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists L1517 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LP212 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LP212 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ LP213 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists LP213 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ M2870 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists M2870 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ M32325125 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists M32325125 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ MCD32212 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists MCD32212 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P212 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P212 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P260520B6 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P260520B6 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P260530B6 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P260530B6 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P43720 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P43720 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P51000 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P51000 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P54000 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P54000 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P550232 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P550232 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P650810B7 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P650810B7 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P726 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P726 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ P779567 page in verification queue	Donaldson	partial	Fleetguard's online catalog lists P779567 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PF500 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PF500 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PM51000 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PM51000 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PM54000 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PM54000 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PM6016 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PM6016 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PM6035 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PM6035 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PT434	Baldwin Filters	partial	Fleetguard's online catalog lists PT434 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PT434	Baldwin Filters	partial	Baldwin's Form 561 Number-Finder cross-reference lists HF6091 (FLEETGUARD) as replaced by Baldwin PT434. Form/fit listing without published performance data — verify micron grade, collapse rating and seal configuration before substituting.
↔ PT43410 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PT43410 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ PT477 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists PT477 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ R2250P page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists R2250P as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SF529206525WC page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SF529206525WC as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ SH56141 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists SH56141 as an interchange for HF6091. Envelope cross-reference; verify micron grade, collapse rating and seal configuration before substituting.
↔ WD422 page in verification queue	Aftermarket	partial	Fleetguard's online catalog lists WD422 as an interchange for HF6091. 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 HF6091 model number is decoded

HF6091Fleetguard HF-series hydraulic cartridge element part number.
122.17 mmOverall height.
66.67 mmLargest end inside diameter.

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 replaces the HF6091 filter element?

85 partial match(es) requiring parameter review

How do I read the HF6091 part number?

See the designation decoder above: each segment of HF6091 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 →

HF28084 HF28086 HF28088 HF28201 HF28202 97×247 mm HF28652 HF28658 95×193 mm HF28660 HF28662 HF28667

Reviewed & verified by the ElementRef engineering desk against Cummins Filtration / Fleetguard on 2026-09-28. Read our editorial & correction policy.