Aztec Bolting — When The Work Is CRITICAL

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Filling The Reservoir

NOTE: The pump has been shipped without oil in the reservoir. High-grade hydraulic oil has been shipped with the pump in a separate container. If additional oil is required, use a high-grade, approved hydraulic oil.

  1. Clean the area around the filler cap to remove all dust and grit. Any dirt or dust in the oil can damage the polished surfaces and precision-fit components of the pump.
  2. Retract all cylinders to the return position.
  3. Remove the filler cap, and insert a clean funnel and filter. Fill with hydraulic oil to 1/2” from the top of the filler hole. Replace filler cap with the breather-hole in the filler cap open.
  4. Cycle the pump (with cylinders attached) several times. Retract the cylinders, and check the oil level in the pump reservoir again.

Hydraulic Connections

  1. Clean all the areas around the oil ports of the pump and cylinder.
  2. Inspect all threads and fittings for signs of wear or damage, and replace as needed.
  3. Clean all hose ends, couplers or union ends.
  4. Remove the thread protectors from the hydraulic oil outlets. Connect the hose assembly to the hydraulic oil outlet, and couple the hose to the cylinder. Although a high-grade, non-hardening thread sealant is preferred, teflon tape may be used to seal hydraulic connections ‘if only one layer of tape is used. Apply carefully to prevent the tape from being pinched by the coupler and broken off inside the pipe end. Any loose pieces of tape could travel through the system and obstruct the flow of oil.

Priming The Pump

When operating the pump for the first time:

  1. Valve and hose connections must be tight, and the reservoir must be filled to the proper oil level. Start the motor.
  2. Jog the pump several times to build pressure. If the pump doesn’t build pressure, it may not be primed. Disconnect a hose from the system and route it back to the pump reservoir. Run the pump until a steady flow of oil is observed free of suspended air bubbles. Reconnect the hose to the system.
  3. Run cylinder out to its full travel several times to eliminate air from the system. For more complete instructions, refer to the section titled “Bleeding Air From The System.”
  4. The pump is ready to be put into regular operation.

IMPORTANT: After eliminating trapped air from a large work-holding system, retract the cylinders and refill the pump reservoir to 1/2” from the top of the filler hole.
Adjusting The Pressure Regulating Controls
The pressure regulating valve and pressure switch are shown in Figure 4. The pressure regulating valve can be adjusted to bypass oil at a given pressure setting while the pump continues to run. The pressure switch can be adjusted to stop the pump at a given pressure setting. To ensure accuracy and low pressure differential (approx. 300 PSI) throughout the pressure range (1,000 to 10,000 PSI depending on the pump model), the pressure switch should be used with the pressure regulating valve. The pressure switch must be set at a pressure lower than the pressure regulating valve to work properly.

Hydraulic Power ConsolesAdjusting The Pressure Regulating Valve

NOTE: For easy adjustment of the pressure regulating valve, pressure by increasing to the desired pressure setting.

  1. Loosen the locknut on the pressure regulating valve (C), and back the adjusting screw (B) out a few turns with a thumb screw by turning in a counterclockwise direction. This will decrease the setting to a lower than desired pressure.
  2. The pump must be completely connected. Set the motor control toggle switch on “Run” and push the “Start” button.
  3. Slowly turn the adjusting screw (B) in a clockwise direction. This gradually increases the pressure setting. When the desired pressure is reached, lock the adjusting screw in position b) tightening the locknut.    

IMPORTANT:

Adjusting The Pressure Switch

Generally, the pressure switch should be used with the pressure regulating valve. A pressure switch can be used alone for operating electrical devices such as motors, solenoids, relays, etc., which are located elsewhere in the circuit. Refer to Figure 4.

  1. Loosen the locknut on the pressure switch (D), and turn adjusting screw (A) in a clockwise direction. This increases the pressure setting to a higher than desired pressure.
  2. Adjust the pressure regulating valve to the desired pressure setting by using the procedure previously outlined.
  3. With the pump running and bypassing oil at the desired pressure, slowly turn the pressure switch adjusting screw (A) in a counterclockwise direction, decreasing the pressure switch setting until the pump motor shuts off. Then lock the adjusting screw (A) in position by tightening the locknut.
  4. Release pressure. Run the pump to check the pressure setting and cut-out of the motor. If may be necessary to make a second adjustment.

NOTE: When the pressure switch setting is reached, the motor will shut off. However, the “coast” of the motor continues to deliver oil for a brief period. The pressure regulating valve bypasses this surplus oil, preventing it from going into the system. As a result, the pressure differential can be held to approximately 300 PSI.

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