Graco 918334, Instructions-Parts List Manual

Page: 28 / 86

28 310528
Ram Troubleshooting
Problem Cause(s) Solution(s)
Ram won’t raise or lower Closed main air valve or clogged air line Open air valve, clear air line
Not enough air pressure
Increase ram pressure
Worn or damaged piston Replace piston. See procedure in
Form #310523.
Hand valve closed or clogged Open, clear hand valve or exhaust
Ram raises or lowers too fast Ram air pressure too high Decrease ram air pressure
Air leaks around cylinder rod Worn rod seal Replace o-rings in guide sleeve.
See procedure in Form #310523.
Fluid squeezes past follower plate
i
Ram air pressure too high Decrease ram air pressure
wipers
Worn or damaged wipers Replace wipers. See procedure on
page 32.
Pump won’t prime properly, or
i
Closed main air valve or clogged air line Open air valve, clear air line
pumps air
Not enough pump air pressure Increase pump pressure
Worn or damaged piston Replace piston. See procedure in
Form #310523.
Hand valve closed or clogged Open, clear hand valve or exhaust
Hand valve dirty, worn or damaged Clean, service hand valve
Bent drum has stopped follower Replace drum
Air pressure won’t hold drum
d
h l t
Closed main air valve or clogged air line Open air valve, clear air line
down or push plate up
Not enough ram air pressure Increase ram air pressure
Valve passage clogged Clean valve passage
Worn piston seal Replace seal