Ram And Hydraulic Power Supply Troubleshooting - Graco Therm-O-Flow 55-H Instructions-Parts List Manual

Ram and Hydraulic Power Supply
For more information about the ram or hydraulic power supply, see Form# 310–533.
Problem
Ram won't raise or lower or
ram moves too slowly ram moves too slowly
Ram raises or lowers too fast
Hydraulic fluid leaks around
cylinder rod
Fluid squeezes past follower q p
plate wipers plate wipers
Material pump won't prime
p p p
properly or pumps air properly, or pumps air
Troubleshooting
Cause(s)
Closed main air valve or clogged air line. Open air valve, clear air line.
Not enough pressure.
Worn or damaged piston.
Hand valve closed or clogged.
Hydraulic valve is not working.
Hydraulic fluid regulator not working.
Hydraulic filter clogged.
Low hydraulic fluid level.
Ram pressure too high.
Worn rod seal.
Ram pressure too high.
Worn or damaged wipers.
Closed main air valve or clogged air line. Open air valve, clear air line.
Not enough material pump air pressure.
Worn or damaged ram piston.
Hand valve closed or clogged.
Hand valve dirty, worn or damaged.
Bent drum has stopped follower.
Hydraulic valve is not working.
Hydraulic filter clogged.
Low hydraulic fluid level.
Ram hand valve lever not in the down
position.
Ram down pressure to low.
Solution(s)
Increase ram pressure.
Replace piston. See Form# 310–533.
Open, clear hand valve or exhaust.
Replace hydraulic valve. See
Form# 310–533.
Replace hydraulic fluid regulator. See
Form# 310–533.
Clean or replace hydraulic filter. See
Form# 310–533.
Check for leaks. Refill reservoir. See
page Form# 310–533.
Decrease ram pressure.
Replace o-rings in guide sleeve. See
Form# 310–533.
Decrease ram pressure.
Replace wipers. See procedure in the
Supply Unit documentation.
Increase material pump pressure.
Replace ram piston. See
Form# 310–533.
Open, clear hand valve or exhaust.
Clean, service hand valve.
Replace drum.
Replace hydraulic valve. See
Form# 310–533.
Clean or replace hydraulic filter. See
Form# 310–533.
Check for leaks. Refill reservoir. See
Form# 310–533.
Move ram hand valve lever to the
down position.
Increase ram down air pressure.
Continued on the next page.
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