Servo Piston Filler Is Inaccurate on Sauces

Check product temperature, entrained air and feed consistency first, then inspect piston seals, check valves, servo homing, mechanical coupling and suck-back settings by nozzle.

Stop automatic operation, isolate electrical and pneumatic energy, close and depressurize product circuits, and follow the machine lockout/tagout procedure before opening guards or removing a valve. Quarantine product made since the last confirmed good check.

Locate the fault

• Dose weight varies between strokes
• Nozzles drip or pull strings after filling
• One piston loses volume over a run
• The machine alarms during high-viscosity products

Inspection sequence

1. Collect dose weight and servo position data for each piston channel
2. Inspect hopper level, agitation and signs of air entrainment
3. Trend cylinder fill pressure or motor torque through suction and discharge
4. Check home repeatability and mechanical coupling under lockout
5. Perform an approved seal-leakage or hold test
6. Measure product temperature and representative viscosity or consistency

Corrective work

• Restore constant hopper feed and gentle agitation without incorporating air
• Replace worn hygienic seals and service the product valve
• Correct servo homing, coupling and stroke calibration
• Control product temperature and use a validated speed and nozzle profile for the viscosity

Operating records and follow-up

• Trend motor torque and dose by piston
• Keep product temperature within the recipe window
• Prime cylinders with a documented procedure
• Inspect seals based on cycles and product abrasiveness
• Save protected servo and suck-back recipes

Equipment details: Automatic Servo Piston Filling Line for Viscous Sauces – Ketchup, Soy Sauce, Mayonnaise.