Diebolt 23521, direct aftermarket replacement. This hydraulic filter element delivers reliable fluid contamination control using an inorganic microfibre filtration media with a 12-micron rating. Designed with an out-in flow path, it is a direct replacement for filters from major brands including Hydac, New Holland (CNH), Baldwin, and Parker Parfit. This aftermarket component matches original equipment specifications without the premium cost.
Technical properties & cross references
Specifications
| Filtration Media |
Inorganic Microfibers 12 µm |
| Media type |
Inorganic Microfibers |
| Filtration Rating |
12 µm |
| Flow direction |
Out-In |
| Total Height |
384.5 mm (15 1/8") |
| Bypass Valve Opening Pressure |
3 bar (44 PSI) |
| Largest Inner Diameter |
36 mm (1 13/32") |
| Smallest Inner Diameter |
34.2 mm (1 11/32") |
| Largest Outer Diameter |
73 mm (2 7/8") |
| Stat. HS-Code |
84149000 |
| Country of Manufacture |
China |
Price beat guarantee
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller |
Price |
Checked |
| Oxfil |
USD 56.04 |
16 Oct 2026 |
| FilterFinder Online |
USD 121.00 |
12 Oct 2026 |
| G&T Engine Parts |
USD 151.34 |
12 Oct 2026 |
| Spare Part Mart |
USD 44.83 |
Today |
Our price of USD 44.83 is 20% to 70% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Use cases & applications
Dusty and high-debris environments
On construction or agricultural sites, airborne dirt loads the hydraulic system rapidly. The 12-micron microfibre media captures fine particles before they reach pumps and valves, reducing abrasive wear and unscheduled repairs.
Continuous-duty industrial operation
In manufacturing plants where hydraulic power runs around the clock, extended filter service life is critical. The high dirt-holding capacity of the inorganic microfibre element supports longer intervals between changes, keeping production lines moving.
Mixed-fleet maintenance
Workshops servicing both Hydac and New Holland machinery can consolidate inventory with this filter. One sku covers multiple brands, cutting purchasing complexity and freeing up shelf space.
Preventive maintenance scheduling
When planning routine hydraulic system overhauls, this element offers a cost-effective drop-in that performs like the branded equivalent. Replacing filters on schedule with a dependable aftermarket part helps lock in predictable maintenance budgets.
Frequently asked questions
Which filters does this filter replace?
It cross-references with elements from Airfil, Baldwin, Diebolt, Fai Filtri, Fleetguard, Hydac, New Holland (CNH), Oxfil, Parker Parfit, Poclain, ST Separat Tech, and Stauff. It is designed to fit hydraulic systems on Hydac and New Holland (CNH) equipment. Always verify your existing filter dimensions before ordering.
What is the filtration rating?
The element is rated at 12 microns absolute, using inorganic microfibre media. This fine level of filtration protects sensitive hydraulic components from damaging particulate contamination.
What are the dimensions and fitting details?
Total height is 384.5 mm. The largest outer diameter is 73 mm, with largest inner diameter 36 mm and smallest inner diameter 34.2 mm. A bypass valve opens at 3 bar to maintain flow if the element becomes clogged, and the flow direction is out-in.
Is this a genuine OEM filter?
No, it is an aftermarket direct replacement. It is manufactured to match the form, fit, and performance of the original specification, providing a cost-effective alternative without compromising hydraulic system integrity.
How do I install this filter?
The element drops directly into the housing as a replacement for the old one. Ensure the flow direction (out-in) aligns with the system design. Professional installation is recommended to avoid seal damage and guarantee correct seating.