Hydac 3933RK015BN, direct aftermarket replacement. This filter is an aftermarket oil filter designed to replace filters from leading brands including Caterpillar, Donaldson, Fleetguard, and Mann-Filter. It features inorganic microfibers media with a 25 µm filtration rating and a collapse pressure of 10 bar. With a total height of 333 mm, an outer diameter of 90 mm, and a smallest inner diameter of 40.7 mm, this filter is built to the original dimensions and ratings for reliable performance in hydraulic and lubrication systems.
Technical properties & cross references
Specifications
| Element Collapse pressure |
10 bar (145 PSI) |
| Filtration Media |
Inorganic Microfibers 25 µm |
| Media type |
Inorganic Microfibers |
| Filtration Rating |
25 µm |
| Total Height |
333 mm (13 1/8") |
| Product Net Weight |
0.59 kg (1.3 lbs) |
| Smallest Inner Diameter |
40.7 mm (1 19/32") |
| Outer Diameter |
90 mm (3 17/32") |
| 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 |
| eBay, aftermarket seller |
USD 66.14 |
6 Oct 2026 |
| Oxfil |
USD 72.85 |
16 Oct 2026 |
| Hydrafil |
USD 202.95 |
14 Oct 2026 |
| G&T Engine Parts |
USD 292.85 |
14 Oct 2026 |
| Spare Part Mart |
USD 58.28 |
Today |
Our price of USD 58.28 is 12% to 80% 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
Heavy-Duty Construction
In demanding construction environments, this filter protects hydraulic systems from wear caused by 25 µm particles. Its 10 bar collapse pressure ensures durability under high differential pressure during peak loads.
Continuous Mining Operations
For mining equipment running 24/7, the inorganic microfibers media captures fine contaminants to extend oil life and reduce unplanned downtime. The robust construction withstands constant vibration and pressure spikes.
Fleet Maintenance Consolidation
Fleet managers can simplify inventory by using this single filter across multiple brands like Caterpillar, Komatsu, and Hydac. This reduces stock complexity and ensures consistent filtration quality across diverse equipment.
Cold-Start Protection
In cold climates, the filter's media maintains efficient filtration even with high-viscosity oil. The 10 bar collapse rating prevents bypass valve opening during cold starts, ensuring full filtration from the first moment.
Frequently asked questions
Will this filter fit my Caterpillar or Komatsu machine?
This aftermarket filter is a direct replacement for filters used in Caterpillar, Komatsu, Hydac, and Schaeff (Terex) equipment. However, we recommend checking your machine's filter specifications against our dimensions: total height 333 mm, outer diameter 90 mm, and smallest inner diameter 40.7 mm.
What is the filtration rating and media type?
The filter uses inorganic microfibers media with a 25 µm filtration rating. This provides high dirt-holding capacity and efficient capture of fine particles to protect sensitive components.
What are the exact dimensions and thread size?
The overall dimensions are: height 333 mm, outer diameter 90 mm, and smallest inner diameter 40.7 mm. Thread size is not specified; please verify compatibility with your existing filter head.
Is this an OEM or genuine filter?
No, this is an aftermarket replacement built to the original dimensions and ratings. It is not branded as genuine or OEM but is designed to perform equivalently to original filters from brands like Caterpillar, Donaldson, and Fleetguard.
How do I install this oil filter?
Installation is similar to standard spin-on or cartridge filters. Ensure the sealing surface is clean, lubricate the gasket lightly, and tighten to the manufacturer's recommended torque. Always follow your equipment's service manual.