PCD Pump User Guide
Troubleshooting
2/20/19
GPD Global
®
22
Troubleshooting
Figure 5:
Dispense results include bubbles or skips.
Figure 6:
Desired results - no bubbles or skips.
Table 4:
Troubleshooting
Error
Possible Cause
Correction
No or too little medium
conveyed
Needle blocked.
Clean/replace the needle.
Medium hardened.
Dispenser clean.
Needle too small or too long.
Use a different needle cross-section. Reduce the
speed / flow rate.
Stator swollen.
Replace the stator.
Inadequate supply of medium.
Supply the medium, check the hose, check the
primary pressure and increase it if necessary.
Motor not connected.
Connect the motor.
Dripping / “running on” of
the medium
Sucking back not set correctly.
Set the sucking back.
Air bubbles in the medium.
Bleed the medium.
Medium compressible.
Degas the medium.
Dispense results include
bubbles or skips. Exam-
ple: Figure 5
The Union ring may have been tight-
ened too much. The union ring holds
the stator in place during dispensing.
If the union ring is too tight, it can col-
lapse the stator on the rotor and
cause voids in dispensed material.
1 - Loosen the union ring 1/8 turn to 1/4 turn.
2 - Rerun dispense process and inspect results.
3 - Repeat above steps until desired results are
attained. Example: Figure 6
