7790 4 10/25/16
PROBLEM ACTION
1. Unit will not lift rated load. Purge air from hydraulic system by following procedure under
SETUP.
2. Unit will not sustain rated load or feels “spongy” under
rated load.
Purge air from hydraulic system as above.
3. Unit will not lift to full height.
Purge air from hydraulic system as above or check oil level in reservoir.
4. Unit still does not operate. Contact Sunex authorized hydraulic service center.
PREVENTATIVE MAINTENANCE (cont.)
5. Inspect the jack before each use. Do not use the jack if any component is cracked, broken, bent, shows sign of damage or
leaks hydraulic fluid. Do not use the jack if it has loose or missing hardware or components, or is modified in any way. Take
corrective action before using the jack again.
6. Do not attempt to make any hydraulic repairs unless you are a qualified hydraulic repair person that is familiar with
this equipment.
TROUBLESHOOTING
OWNER'S MANUAL
7790
CAPACITY: 300 LB.
CLUTCH JACK
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