IV-80
HYDRAULIC UNITSPILOT VALVE
TROUBLESHOOTING
Symptom Probable Causes Remedy
Secondary pressure
doesn·t rise
• Primary pressure is insufficient
• Spring is damaged or permanently de-
formed
• The clearance between the spool and
casing is abnormally large
• There is looseness in the handle
• Keep the primary pressure
• Replace the spring
• Replace the spool and casing assembly
• Disassemble and reassemble, or replace
the handle
Secondary pressure
doesn·t stabilize
• Sliding parts are catching
• Tank line pressure fluctuates
• Air gets mixed into the piping
• Repair or replace
• Remove the abnormal portions of the
tank line
• Operate the machine several times and
bleed out the air
Secondary pressure is
high
• Tank line pressure is high
• Sliding parts are catching
• Remove the abnormal portions of the
tank line
• Repair or replace
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