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Home›Repair guides›Relief Valve Pressure Setting Adjustment

Allmand — Relief Valve Pressure Setting Adjustment

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

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Procedure

  1. Measure the distance between the bottom of the jam nut (Item 28) and the end of the adjusting screw (Item 29) before disassembly.
  2. Make note of this dimension so upon re-assembly of the valve the measurement can serve as a guide in getting to the original setting.
  3. Do this for each relief valve being worked on.
  4. Loosen the jam nut (Item 28) on the applicable relief valve.
  5. Tighten the relief valve adjusting screw (Item 29) to increase the setting.
  6. Loosen the adjusting screw to reduce the setting.
  7. After the changes are made, retighten the jam nut (70 in-lb max.) against the adapter (Item 5).
  8. Follow the original bleeding and startup instructions supplied with the 108 Series Power Unit.

Specs & torque values

  • UP Side pressure setting change: 500 psi per full turn
  • DN Side pressure setting change: 300 psi per full turn
  • Jam nut torque: 70 in-lb max.

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.