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Home›Repair guides›Relief Valve Cleaning

Allmand — Relief Valve Cleaning

A Allmand service procedure — check it applies to your exact model before use.

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Procedure

  1. Follow the measuring instructions given above (measure distance before disassembly).
  2. Loosen the jam nut (Item 28).
  3. Unscrew the adjusting screw (Item 29) completely taking care to catch all internal relief valve components.
  4. Flush the relief valve seat (the cavity in the adapter, Item 5, into which the adjusting screw goes) to remove any contamination.
  5. Examine the relief valve ball (Item 6) and clean as needed.
  6. Reassemble all relief valve components as shown in the diagram.
  7. Tighten the adjusting screw and jam nut to achieve the earlier recorded measurement.
  8. Repeat for second relief valve.
  9. Follow the original bleeding and startup instructions supplied with the 108 Series Power Unit.

Source: manual:Hydraulic_Power_Unit_(V-Series only)_Parker_Relief_Valve_Adjustment_and_Parts_List.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.