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HPK03 Cartridge

The sturdy HPK03 filter is constructed of ductile iron for durability in high pressure applications. Housing includes fluoroelastomer head-to-housing seal. Meets HF3 specification.


  • High Pressure Circuits
  • In-Plant Systems
  • Mobile Equipment
  • Servo Valve Circuits


  • Rugged construction for reliable performance
  • Highly configurable – Flexible mix and match system of in-stock heads, housings and cartridges
  • Featuring our high-performance DT filters or standard filters with multiple efficiency options – allowing you to achieve the performance you need for most any application


  • Strong, durable ductile iron construction
  • Standard housing drain plug simplifies servicing
  • Fluoroelastomer head-to-housing seal
  • Meets HF3 specification
  • High collapse filter options for no bypass applications
  • Available indicators:
    • Visual
    • AC/DC electrical
  • Viton® seals are used on high-performance DT filters
  • Buna-N® seals are used on standard filters
  • Working pressure to: 206.9 bar / 3000 psi
  • Rated static burst to: 4.13 bar / 6000 psi
  • Flow range to: 227 lpm /60 gpm
  • Porting size options: SAE-12 or SAE-16 O-ring
  • Standard bypass ratings of: 
    • 3.5 bar / 50 psi
    • No bypass

Available Media Types

  • Donaldson exclusive Synteq™ – synthetic fiber media for greater filtration efficiency and higher dust-holding capacity
  • Many different efficiency grades from which to choose
  • Water absorbing media
  • Wire mesh


Viton® and Buna-N® are registered trademark of E. I. DuPont de Nemours and Company. 


The following are recommended practices for hydraulic filter servicing and handling. These steps are universal to many hydraulic systems. This servicing information is provided as a best practices guide. Donaldson recommends that you follow the filter service instructions supplied by your original equipment manufacturer. These recommended practices are not intended to replace or supersede the service instructions supplied by your equipment or vehicle manufacturer.
  1. Check the filter service indicator
    Check to see that the OEM specified service interval has been reached or that the service indicator shows that the filter is due for servicing.

  2. Turn system off and release pressure
    Ensure that the hydraulic system is turned off.
    Check that there is no pressure present.

  3. Use oil drain port to better control oil removal from the housing 

  4. Unscrew the cartridge housing

  5. Remove the used filter and gasket, if applicable
    Properly dispose of the cartridge according to local regulations.

  6. Clean the head seal area and housing
    Clean out any sediment from the inside of the filter housing.

  7. Inspect the new filter cartridge for damage
    Check the new filter you will be installing for any shipping and handling damage. Do not install a damaged filter.

  8. Install and lubricate seals, gaskets and threads. 
    Lubricate the o-rings, gaskets, housing seals and threads with clean system oil.

  9. Install new cartridge into the housing

  10. Align threads – spin on housing

  11. Install housing according to manufacturer instructions

  12. Bleed the hydraulic system and check for leaks

Donaldson Hydraulic Filtration Overview

Donaldson provides filters and contamination control products to protect hydraulic components -- in the factory and on heavy-duty equipment. This module provides an overview of hydraulic systems and the advantages of Donaldson hydraulic filters.

Donaldson Hydraulic Filter Servicing

Donaldson provides best practices and recommended steps for hydraulic filter servicing. By following these simple steps, discover how you can reduce maintenance costs and extend the life of your hydraulic system.