Troubleshooting - Graco SaniForce Drum Unloader Repair Parts

Troubleshooting

Troubleshooting Troubleshooting
Problem Problem Problem
Ram will not raise or lower.
Ram raises and lowers too fast or
too slow (flow control adjustment
only available in enclosed control
panels).
Air leaks around cylinder rod.
Fluid squeezes past platen seal or
wipers.
Pump will not prime properly or
pumps air.
Pump fails to operate.
3A5404F
• Prior to performing any repairs, perform the Ram
and Pump Pressure Relief procedures.
• Check all possible problems before disassembling
the ram, pump, or platen.
Cause
Cause Cause
Closed air valve or clogged
upstream air line.
Not enough ram air pressure.
Worn or damaged air cylinder
piston.
Ram air flow needs adjusting.
Worn rod seal.
Ram air pressure is too high.
Seal not fully inflated
Worn or damaged wipers.
Closed air valve or clogged air line. Open, clear.
Not enough ram air pressure.
Pump running too fast.
Ram valve closed or clogged.
Exposed manual control Ram
director valve is dirty, worn, or
damaged.
Restricted air line or inadequate
air supply.
Insufficient air pressure; closed or
clogged air valves, etc.
Exhausted fluid supply.
Damaged air motor.
Troubleshooting
Solution
Solution Solution
Open, clear.
Increase.
Replace.
Adjust flow control valves FC2
or FC3 as required. Refer to the
control panel manual for more
information.
Replace.
Decrease.
Increase seal air pressure, check
for seal air leak. Use the flow
valve, if present.
Replace.
Increase.
Reduce pump speed.
Open, clear.
Clean, service.
Increase air supply line diameter
or increase air supply volume.
Open or clean air valves, etc.
Change drum.
Service.
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