Precision Filter Elements – Models TR-21461 · TR-25450 · TR-25470

Three precision filter elements engineered for fine particulate removal and oil conditioning in hydraulic power units, circulating lube oil systems, and water-glycol (WG) fluid circuits. Although sharing the same product family, the three models serve distinctly different filtration positions – from coarse suction pre-filtration to absolute-rated 2–3 µm fine filtration. Correct model selection is critical to achieving the required oil cleanliness class and protecting downstream components.

Key Features

• TR-21461 – Metal mesh suction pre-filter element, washable and reusable; 80/100 µm coarse filtration grade; protects main pumps from large particulates at the reservoir suction line

• TR-25450 – 3 µm absolute-rated precision filter element; long-life cellulose media with high dirt-absorbing capacity; optimized for high-viscosity oils (220–320–460 cSt)

• TR-25470 – 2 µm absolute-rated two-stage element; M-filter medium in the upper section plus X-filter medium in the lower section, separated by a non-woven disc to protect against excessive water; specifically designed for water-glycol (WG) fluids

• 114 mm element height – compact axial platform fits BU, SE, AL, and OSCA SU/SS filter housings

• Bypass-free design – replacement possible without shutting down the main system

• Disposable (TR-25450, TR-25470) or washable (TR-21461)

Technical Specifications

Source data compiled from manufacturer element catalogs .

Application Guidance

TR-21461 – Deployed as a suction-line pre-filter on:

• SE-series suction housing installations

• Reservoir suction lines where coarse particulate protection is required

• Washable design enables repeated cleaning and continued service

TR-25450 – Deployed on:

• Circulating lube oil and hydraulic systems with high-viscosity oils (220–460 cSt)

• BU100/200/300E, SE100 up to SE600, AL100, and OSCA AL-series filter housings

• Applications requiring long service life and high dirt-holding capacity

TR-25470 – Deployed on:

• Water-glycol (HFC) hydraulic systems – BU100/200/300EW, SE100WG up to SE600WG, AL100WG, OSCA AL-WG SU102/SU103

• The two-stage M + X media build with non-woven disc separation provides dedicated water handling and particle removal in WG fluids

• Protects downstream precision components in water-glycol service

Why Precision Filtration Matters

Contamination remains the primary root cause of hydraulic and lube oil system failures. These precision elements address the full contaminant spectrum:

• Large particulates – TR-21461's metal mesh intercepts coarse debris at the suction line before it reaches the pump

• Fine particles – TR-25450's absolute-rated cellulose media traps abrasive particles down to 3 µm

• Fine particles + water – TR-25470's two-stage build captures 2 µm particles while the non-woven disc protects the lower X-medium against water overload

• Sludge & varnish – special cellulose material adsorbs oxidation residues that conventional glass-fiber elements miss

Fluid Compatibility

• Mineral hydraulic oil (ISO HM, HV) – all three models

• High-viscosity mineral oil (220–460 cSt) – TR-25450 optimized

• Synthetic hydraulic fluids – verify media compatibility

• Water-glycol (HFC) – TR-25470 specifically engineered

• Phosphate esters (HFDR) – consult factory for media compatibility

⚠️ TR-25450 and TR-25470 are not interchangeable despite sharing the same ∅179 × H114 mm envelope. TR-25450 is a 3 µm absolute element for high-viscosity mineral oils. TR-25470 is a 2 µm absolute two-stage element specifically engineered for water-glycol fluids – its M + X media with non-woven disc separator is essential for WG service and will not perform correctly in mineral oil circuits . TR-21461 is a coarse suction pre-filter with entirely different function and dimensions.

Installation & Service

1. Isolate the filter housing from system pressure; confirm zero differential pressure.

2. Open the housing cover; withdraw the spent element.

3. Inspect the housing interior for sludge accumulation – heavy sludge indicates the need for reservoir cleaning.

4. TR-21461: clean the metal mesh with solvent, dry thoroughly, and reinstall – no replacement required.

5. TR-25450 / TR-25470: seat the new element vertically – confirm correct orientation for axial flow; renew all gaskets.

6. Close the housing; torque fasteners evenly per specification.

7. Restart the system; monitor differential pressure.

8. Replace TR-25450 / TR-25470 per clogging indicator or service schedule.

Ordering

Specify the exact model (TR-21461 / TR-25450 / TR-25470) together with:

• Fluid type (mineral hydraulic oil / high-viscosity oil / water-glycol HFC)

• Required micron rating (80/100 µm / 3 µm absolute / 2 µm absolute)

• Host filter housing model (SE / BU / SE / AL / OSCA SU-SS / OSCA AL-WG series)

• Element dimensions – confirm against existing element (TR-21461: ∅35×H50 mm; TR-25450 & TR-25470: ∅179×H114 mm)

• Operating temperature and pressure of the circuit

Provide your existing element's dimensions or the host filter housing model for cross-reference confirmation. Custom configurations are available on request.

All values nominal; TR-21461 is a washable metal mesh suction pre-filter, ∅35 × H50 mm, 80/100 µm, for SE-series suction housings . TR-25450 is a 3 µm absolute-rated cellulose filter element, ∅179 × H114 mm, engineered for high-viscosity mineral oils (220–460 cSt), compatible with BU100/200/300E, SE100–SE600, AL100, OSCA AL-series SU/SS102, SU/SS103 . TR-25470 is a 2 µm absolute-rated two-stage element, ∅179 × H114 mm, with M-medium upper section and X-medium lower section separated by a non-woven disc, specifically designed for water-glycol (HFC) fluids, compatible with BU100/200/300EW, SE100WG–SE600WG, AL100WG, OSCA AL-WG SU102/SU103 . All models feature 114 mm element height platform with bypass-free design. TR-21461 is washable/reusable; TR-25450 and TR-25470 are disposable. Select per fluid type and filtration position – TR-21461 for suction pre-filtration, TR-25450 for high-viscosity oil fine filtration, TR-25470 for water-glycol service.