Troubleshooting
Troubleshooting Techniques
Because the pumps are mechanically linked, the action of one pump can affect the readings of the second pump. Therefore, the key to successful troubleshooting is to be
sure to isolate the problem.
For example, if the secondary pump pressure, as read on the gauge, is low and sluggish during the pump changeover. The most likely problem is a binding primary pump. To isolate the problem:
1.Relieve the pressure.
2.With the sampling valves still open, set the air supply regulator to the lowest setting and open the bleed- type main air valve (1). Refer to figure 6. Increase the regulator setting until the pump just begins to move. Notice the position of the secondary pump (11). Turn off the
WARNING
To reduce the risk of a serious injury, always follow the Pressure Relief Procedure on page 11 whenever you are instructed to relieve the pressure.
3.With the main
4.Unscrew the connecting rod nut (11) from the secondary pump. Now you can verify the operation of the primary pump alone.
Reinstall the guards (15) on both sides of the proportioner. Turn the main air valve (1) back on and carefully increase the air pressure.
5.Using the sampling valves at the mixer manifold:
A.Open and close the sampling valves and check for pump stalling on both the up and down strokes.
B.Check for rapid gauge response during the pump changeover
6.When the operation of the primary side has been verified, reconnect the connecting rod (11) of the secondary.
7.With the sampling valves still open, set the air supply regulator to the lowest setting and open the bleed- type main air valve (1). Increase the regulator setting until the pump just begins to move. Notice the position of the primary pump. Turn off the bleeder- type main air valve (1) so that the primary pump rod
(10)is at its lowest position when the pump stops.
8.With the main
9.Unscrew the connecting rod nut (10) from the primary pump. Now you can verify the operation of the secondary pump alone.
Reinstall the guards (15) on both sides of the proportioner. Turn the main air valve (1) back on and carefully increase the air pressure.
10.Using the sampling valves at the mixer manifold:
A.Open and close the sampling valves and check for pump stalling on both the up and down strokes.
B.Check for rapid gauge response during the pump changeover
11.When the operation of the secondary side has been verified, reconnect the connecting rod (10) of the primary pump.
WARNING
Use very low air pressure to the air motor when troubleshooting the system. This system can produce very high fluid pressure, which can cause serious injury,
including injection, splashing in the eyes or on the skin, and injury from moving parts.
To reduce the risk of a serious injury, always follow the Pressure Relief Procedure on page 11 if the problem you are checking does not require air.
WARNING
To reduce the risk of injuring or amputating your hands, fingers, or other body parts, never place your hands, body or tools inside the safety panels for any reason while the unit is operating.
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