Troubleshooting; Ram Assembly Troubleshooting - Graco UniDrum C59784 Instructions And Parts List

Troubleshooting

Ram Assembly Troubleshooting

Problem
Ram won't raise or lower
Ram raises or lowers too fast
Ram drops when in the RAISE or
HOLD/NEUTRAL positoin
Fluid squeezes past Follower Plate
wipers
Pump won't prime properly, or
pumps air
309169ZAF
Follow Pressure Relief Procedures, page 27 and 28,
before checking or repairing the UniDrum Supply
System.
NOTE: Check all possible problems and causes before
disassembling the equipment.
Cause
Closed main air shutoff valve or
clogged air line
Not enough air pressure
Worn or damaged piston
Safety Pins (M) still in place
Ram air pressure too high
Regulator R3 pressure set too high
Ram air pressure too high
Worn or damaged wipers
Not enough ram air pressure
Worn or damaged ram piston
Bent drum has stopped Follower
Plate
Troubleshooting
Solution
Open air valve, clear air line
Increase ram pressure
Replace piston. See Ram Piston
Service on page 33.
Remove pins.
Decrease ram air pressure
Reset R3 pressure to between 5-7
psi.
Decrease ram air pressure
Replace wipers. See Replacing
Wipers on page 35.
Increase ram pressure
Replace ram piston. See Ram
Piston Service on page 33.
Replace drum
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