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Bob MillsJul 26, 2025
What to do if the piston stalled on my Graco PR70 (E21 Error)?
- HHolly LandryJul 27, 2025
If the piston is stalled on your Graco Dispenser (E21 Error), it might be due to several reasons. First, check if the input air is reduced or removed; reconnect the input air line to the machine and increase the air pressure regulator adjustment. A blocked mixer can also cause this issue; replace the static mixer and consider incorporating or decreasing purge time to prevent future blockages. The ODV adjustment may be too late, so readjust the ODV setting to occur sooner. Additionally, a blocked check valve can cause this problem; remove, clean, and replace the check valve. Finally, an air cylinder failure might be the cause; remove the air cylinder and reinstall cylinder kit items if necessary.
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