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Relief Valve Adjustment: Part 461298

  1. Place a 0-2000 psi pressure gauge on the high-pressure test port at the heat developer block. Start the machine and engage the Kenway oil heat system.
  2. Adjust the cab air temperature to maximum and set the engine idle speed to approximately 1000 rpm.
  3. Remove the cap nut from the oil heat relief valve (mounted on the heat developer block) and loosen the adjusting screw locknut.
  4. Rotate the adjusting screw clockwise with a 1/4" Allen wrench to increase the pressure. The relief valve is set at 1200 psi. Be careful when rotating the adjusting screw so that when the screw stops turning (about 3 turns) not to force it any further. The maximum relief valve pressure that can be set is 1500 psi.
  5. Hold the adjusting screw with the Allen wrench and tighten the locking nut. Tighten the cap nut onto the relief valve.