Duramax® HMK04/24 Hydraulic Spin-On Assemblies

HMK04 (single) and HMK24 (double) Duramax® spin-on filters feature a durable die-cast aluminum head, heavy-duty steel body, with die-cast aluminum top plate for added strength. A special head-to-canister o-ring seal prevents leakage. Both models use the same replacement filters and have identical pressure ratings, reducing inventory. Both filters have identical pressures, but the HMK24 handles greater flow capacity than the HMK04.

Features

• Strong, durable die-cast aluminum head and heavy-duty steel body, with die-cast aluminum top plate construction
• Special head-to-canister o-ring seal prevents leakage
• Nitrile seals standard; flurocarbon seals available on some models
• Both models have identical pressure ratings and use the same replacement filters for reduced inventory
• 3-port head option for charge pumps
• Variety of indicator types and by-pass options
• Working pressures to: 34 bar / 500 psi
• Rated static burst to: 69 bar / 1000 psi
• Flow range to:
  • HMK04: 133 lpm / 35 gpm
  • HMK24: 227 lpm / 60 gpm
• Porting size: 
  • HMK04:
    • ¾", 1" NPT
    • SAE-12 and SAE-16 o-ring
  • HMK24:
    • SAE-20 o-ring
    • 1-¼" SAE 4-bolt flange code 61
• Standard by-pass ratings:
  • 1.73 bar / 25 psi
  • 3.5 bar / 50 psi
  • No by-pass

Benefits

• Proven Duramax filters deliver dependable performance 
• HMK24 double filter head delivers much greater flow capability and contaminant capacity

Applications

• Fluid conditioning systems
• Case drains
• Cooling circuits
• Fuel transfer
• Hydrostatic charge pumps
• Lube oil systems
• Power transmissions
• Return lines
• Side loop systems

Available Media Types

• Donaldson exclusive Synteq™ – synthetic fiber media for greater filtration efficiency and higher dust-holding capacity
• Water absorbing media
• Wire mesh
• 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.

Spin-On Filter 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. Unscrew and remove the old filter and gasket
   Properly dispose of the used filter according to local regulations.
    
4. Wipe the filter head with a clean cloth
   
   
5. Inspect the new filter for damage
   Check the new filter you will be installing for any shipping and handling damage. Do not install a damaged filter.
   
   
6. Lubricate threads
   
   
7. Apply a thin film of motor oil to the gasket
   
   
8. Align threads – spin filter until gasket contact
   Fit the housing to the filter head as instructed on the housing.
   
   
9. Follow the icons on the filter to tighten
   Do not over-tighten.
   
   
10. Bleed the system and check for leaks