Crafco EZ 500 Series II, Manual

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EZ 500 Series II Melter Part Manual
Chapter 8 Troubleshooting
©2019 by Crafco, Inc. All Rights Reserved………………...………………………………..……………...Troubleshooting 8-29
8.4 Pump Troubleshooting
Symptom: Material Does Not Dispense When the Pump is Activated 8.4.1
Step Possible Cause If . . .
1 Is the Hose Temperature Display at or above
325°F?
•
Yes, go to Step 2.
•
No, continue to allow the hose to heat.
(Make sure the Hose dial is set at proper
operating temperature.)
2 Is the red "Pump" light "ON"?
•
Yes, go to Step 3.
•
No, go to Table 8-27 Pump Electrical
Troubleshooting.
3 Is the hose selector switch in the
“ELECTRIC” position as well as the pump
switch should be in “ON ELECTRIC”
position?
•
Yes, go to Step 4.
•
No, move the toggle switches to the proper
positions.
4 With the wand in the shoebox, pull the wand
trigger and look at the material pump shaft
coupler.
Is it spinning clockwise?
•
Yes, shut down machine and look for a plug
in the plumbing.
•
No, adjust the material flow control to
increase the flow.
•
Still no, go to Step 5.
5 Inside the control box and under the front
panel, find the relay cube for the pump. It is
found near the middle, left-hand side of the
box. It is a clear yellow cube with a green
button facing the top of the control box. When
the trigger is engaged does the green light
illuminate?
•
Yes, this indicates that 12Vdc is reaching
the relay coil. Go to Table 8-28 Pump
Electrical Troubleshooting (continued) Step
5 to find the problem.
•
No, go to Table 8-27 Pump Electrical
Troubleshooting , Steps 2 to find the
problem.
6 Is the hydraulic fluid level near the center of
the sight gauge when the machine is cold?
See Fig. 5.1 Hydraulic Fluid Level and Temp.
Gauge.
•
Yes, go to Table 8-27 Pump Electrical
Troubleshooting .
•
No, fill oil to the center of the sight gauge.
Table 8-26 Basic Visual Pump Troubleshooting