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4.1
SETTING SYSTEM PRESSURE/REQUIRED TORQUE
Below is an example of how to properly use the ESW Torque Wrench pressure-torque chart..
Application requires use of an ESW-3 EAGLE PRO hydraulic torque wrench to tighten a 1-1/2" bolt to 2100
Lb. Ft.
STEP 1. Locate the correct model of the torque wrench along the top of the pressure-torque chart
STEP 2. Read straight down the column until you find the closest figure to 2100. In this application it would
be 2164. 2164 is about 3% over the required torque value for this application.
STEP 3. From the figure of 2164, read all the way over to the left hand column of the chart, this will tell you
what pressure the pump must product to reach this torque value. In this case, to reach 2164 lb. ft. of torque
with the ESW-3 torque wrench, the torque wrench pump must product 6600 PSI.
As 2164 lb. ft. of torque is within the +/-3% accuracy range of the ESW-3 torque wrench, you could
leave the pressure at 6600 PSI. For higher precision, you should reduce the 6600 PSI by 3% to 6402
PSI.
SETTING PUMP PRESSURE
4.2
Now that pump pressure has been determined, follow the procedure below to set the pump pressure.
STEP 1. Loosen the lock ring on the "T" handle of the external pressure valve. Turn the "T" handle counter
clockwise until it moves easily.
STEP 2. Turn the pump on. Using the pendant control, push down on the ADVANCE button and hold it.
STEP 3. While continuing to hold the ADVANCE button down, slowly turn the "T" handle clockwise and
watch the pressure rise on the pump pressure gauge.
STEP 4. When the gauge reaches the required pressure (see example above to determine required pressure)
stop turning the "T" handle and allow the pressure to stabilize.
STEP 5. If the pressure continues to rise above required pressure, release the ADVANCE button and turn the
"T" handle counter clockwise, this will reduce system pressure. Press the ADVANCE button again and
slowly bring the pressure up to the required pressure.
STEP 6. Once the pressure is correct, turn the pump off. Tighten the lock ring on the "T" handle against the
valve body. This will lock the "T" handle in place and prevent pressure changes. This sets the pump pressure
which ultimately determines the torque output of the torque wrench. Cycle the pump one final time to ensure
that the pressure is properly set.
IMPORTANT!
Do not adjust the pump pressure while the torque wrench is operating. Adjust the regulator so that the
pressure is increasing, not decreasing. If you have to lower pump pressure, start the pressure setting
procedure from the beginning.
EAGLE PRO INDUSTRIAL TOOLS, INC.
EXAMPLE
9
FORM NO. E10002 REV. A.
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