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Date of Origin – 02/24/11
Updated – 02/03/20
Setting Reliefs Without Gauges:
1. A Pressure Relief valve is located on each side of the pump. Use 9/16” socket and loosen the jam nut on each relief.
Do not remove relief valve.
2. Use a 3/16” hex head wrench and turn the relief clockwise to carefully bottom out relief valve. Do not tighten.
Tightening relief valve can damage the valve seat.
3. Turn relief valve counter clockwise 2½ revolutions. Tighten jam nuts. This will set the pressure at approximately
2500 psi range. Approximately ¼ turn or 90 degrees equals 250 psi adjustment.
PRESSURE RELIEF ADJUSTMENT
The hydraulic power supply pump is equipped with two pressure relief valves to maximum system
pressure at a safe level. These relief valves are located on each side of the pump, 180 degrees from each other. At the
hose connections the ports on side of the pump are marked with “C1” and “C2”. The pressure relief on the “C1” side
sets the pressure for opening the doors and the relief on the”C2” side sets the pressure for closing.
When testing or making adjustments on the pressure relief valve system a gauge in both ports of the pump is required to
ensure the most accurate pressure setting. To adjust pressure relief valves:
Setting Relief Valves with Pressure Gauges:
1. Insert pressure gauges in each pump port “C1” and “C2”.
2. A Pressure Relief valve is located on each side of the pump. Use 9/16” socket and loosen the jamnut on each relief.
Do not remove relief valve.
3. Use a 3/16” hex head wrench and turn the relief clockwise to increase pressure setting, counter clockwise to reduce
the pressure. Approximately ¼ turn or 90 degrees equals 250 psi adjustments.
4. Operate the system until the cylinder is “dead headed” (cylinder at full stroke or fully retracted) and note the
pressure on the gauge. Pumps from factory are preset at 2500 psi.
5. Cycle cylinders in both directions until pressure setting are achieved on both reliefs.
6. Tighten jam nuts and remove gauges.
7. Cycle system to remove any air that may have entered the lines when the gauges were removed.
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