Graco Therm-O-Flow 55-H Instructions-Parts List Manual page 30

Ram and Hydraulic Power Supply
Troubleshooting
Problem
Pressure won't hold drum
down or push plate up down or push plate up
Ram moves in opposite
direction than expected
30 310–534
Cause(s)
Closed main air valve or clogged air line. Open air valve, clear air line.
Not enough ram pressure.
Hydraulic valve passage clogged.
Worn ram piston seal.
Incorrectly connected hydraulic lines, or
incorrectly connected air lines.
(continued)
Solution(s)
Increase ram pressure.
Replace hydraulic valve. See
Form# 310–533.
Replace ram piston seal.
Connect hydraulic or air lines to their
correct connectors. See
Form# 310–533.