Hydraulic W440 Cartridge Assembly

The W440 filter assembly can be manifold mounted to the hydraulic system. The size and material configuration are well-suited for today's demanding proportional and servo valve applications. Standard housing drain plug helps relieve system pressure during filter change-outs.

Features

• Assembly has manifold mounting capability
• Thermal lockout and surge control incorporated in many of the differential pressure indicators
• High collapse filter available for use with non-by-pass applications – collapse options range from 10 to 207 bar / 150 to 3,000 psi
• Positive sealing poppet by-pass for reliability and no leakage
• Range of indicator options – visual pop-up, electrical/visual or all electronic models available
• Compact design for use with servo or proportional valve
• Two housing length options for design flexibility
• Differential pressure indicator line works with an assortment of by-pass valves
• Fluorocarbon seals are standard
• Working pressure to: 276 bar / 4000 psi
• Rated static burst to: 690 bar / 10,000 psi
• Flow range to: 76 lpm / 20 gpm
• Porting size options: 
  • SAE-12 o-ring
  • Manifold mounting top-ported for subplate mounting
    • 17.5 mm / 0.69 in. holes
    • 31.8 mm / 1.25 in. centers
• Standard by-pass ratings of: 
  • 3.5 bar / 50 psi
  • No by-pass

Benefits

• Rugged cast iron and steel construction for reliable performance
• Highly configurable – this assembly and filter combination give you a lot of flexibility in a very high pressure working range
• Featuring our high-performance DT filters with multiple efficiency options – allowing you to achieve the performance you need for most any application

Applications

• High pressure circuits
• In-plant systems
• Mobile equipment

Available Media Types

• Donaldson high-performance DT cartridges with exclusive Synteq™ – synthetic fiber media for greater filtration efficiency and higher dust-holding capacity
• Many different efficiency grades from which to choose

This servicing information is provided as a best practices guide. It is not intended to replace or supersede the service instructions supplied by your engine or vehicle manufacturer.

Cartridge Servicing

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. Remove the cartridge housing
   
   
4. Remove the used filter and gasket, if applicable
   Properly dispose of the cartridge according to local regulations.
   
   
5. Clean the head seal area and housing
   Clean out any sediment from the inside of the filter housing.
   
   
6. 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.
   
   
7. Install and lubricate seals, gaskets and threads. 
   Lubricate the o-rings, gaskets, housing seals and threads with clean system oil.
   
   
8. Install new cartridge into the housing
   
   
9. Align threads. Spin filter until gasket contacts
   Fit the housing to the filter head as instructions on the housing.
   
   
10. Install housing according to manufacturer instructions
    
    
11. Bleed the hydraulic system and check for leaks