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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 bleeder-type main air valve (1) so
that the secondary pump rod is at its lowest position
when the pump stops.
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 bleed-type air valve (1) off, remove
the thumb screws (14) and guards (15) from each
side of the proportioner.
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.
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Troubleshooting
8.
With the main bleed-type air valve (1) off, remove
the thumb screws (14) and guards (15) from each
side of the proportioner.
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
B. Check for rapid gauge response during the
11. When the operation of the secondary side has been
verified, reconnect the connecting rod (10) of the
primary pump.
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.
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.
for pump stalling on both the up and down
strokes.
pump changeover
WARNING
WARNING
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Table of Contents
Troubleshooting
