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5
TROUBLESHOOTING
Symptom
Possible Causes
Corrective Action
Jack will not lift load
• Release valve not tightly closed
• Load is too heavy
• Ensure release valve tightly closed
• Consider higher capacity jack
Jack will lift, but not maintain
pressure
•
Release valve not tightly closed
• Hydraulic unit malfunction
•
Ensure release valve tightly closed
• Discontinue use, contact Mac Tools
Technical Service
Jack will not lower after unloading • Reservoir overfilled
• Linkages binding
• Drain fluid to proper level
• Clean and lubricate moving parts
• Inspect for damage. If found,
discontinue use and contact Mac
Tools Technical Service
Poor lift performance
• Fluid level low
• Hydraulic unit malfunction
• Ensure proper fluid level
• Discontinue use, contact Mac Tools
Technical Service
Will not lift to full extension
• Fluid level low
• Ensure proper fluid level