Graco SaniForce SDU Series, Instructions - Parts Manual

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Troubleshooting
3A0591ZAG 17
Troubleshooting
1. Follow Pressure Relief Procedure , page 12. 2. Check all possible remedies in the Troubleshooting
Chart before disassembling the pump.
Problem Cause Solution
Ram will not raise or lower. Closed air valve or clogged air line. Open, clear.
Not enough ram air pressure. Increase.
Worn or damaged piston. Replace.
Hand valve closed or clogged. Open, clear.
Ram raises and lowers too fast. Air pressure is too high. Decrease.
Travel rate is not properly adjusted. Exposed Air Controls - open the
director valve less for slower travel,
more for faster travel.
Air leaks around cylinder rod. Worn rod seal. Replace.
Fluid squeezes past ram plate
wipers. Ram air pressure too high. Decrease ram pressure.
Worn or damaged wipers. Replace.
Inflatable seal pressure too low. Increase seal pressure
Pump will not prime properly or
pumps air. Closed air valve or clogged air line. Open, clear.
Not enough air pressure. Increase.
Worn or damaged piston. Replace. See pump manual.
Hand valve closed or clogged. Open, clear.
Hand valve is dirty, worn, or
damaged. Clean, service.
Air assist valve will not hold drum
down or push plate up. Closed air valve or clogged air line. Open, clear.
Not enough air pressure. Increase.
Valve passage clogged. Clean.
Seal pressure builds when drum
tapers, activating the automatic
pressure relief. Seal bleed-off valve (BL) is closed Open. See Integrated Air Controls ,
page 11.