Sunex HD 6744 Manuel Du Propriétaire page 4

OWNER'S MANUAL
IMPORTANT: The number one cause of jack failure in air/hydraulic jacks is dirt and moisture in the air motor and/or hydraulic
system. The shop air supply should be equipped with water and dirt filter traps that should be emptied or cleaned according to
a monthly maintenance schedule. An in line oil lubricator will extend the life of air/hydraulic jacks. Inoperable jacks caused by
poorly equipped or maintained shop air systems are not eligible for warranty consideration. Contaminants can also enter the air/
hydraulic system when the shop air line is disconnected from the jack air line and the line is dropped on the floor. Contaminants in
the air couplers, once reconnected, will be driven into the system.
1. Always store the jack in a well protected area where it will not be exposed to inclement weather, corrosive vapors, abrasive
dust, or any other harmful elements. The jack must be cleaned of water, snow, sand, grit, oil, grease or other foreign matter
before using.
2. The jack must be lubricated periodically in order to prevent premature wearing of parts. A general purpose grease must be
applied to the threads on the extension screw. Do not lubricate any portion of the lift saddle and make sure the saddle is free
from grease, any kind of lubricant, or debris before using the jack. Jacks found to be defective due to worn parts resulting from
inadequate or no lubrication are not eligible for warranty consideration.
3. It should not be necessary to refill or top off the reservoir with hydraulic fluid unless there is an external leak. An external leak
requires immediate repair which must be performed in a dirt-free environment by qualified hydraulic repair personnel who are
familiar with this equipment. Authorized Service Centers are recommended. IMPORTANT: In order to prevent seal damage and
jack failure, never use alcohol, hydraulic brake fluid, or transmission oil in the jack. Use hydraulic jack oil, Chevron Hydraulic Oil
AW ISO 32 or its equivalent Unocal Unax AW 150.
4. Every jack owner is responsible for keeping the jack label clean and readable. Use a mild soap solution to wash external
surfaces of the jack but not any moving hydraulic components.
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
PROBLEM
1. Unit will not lift rated load.
2. Unit will not sustain rated load or feels "spongy" under
rated load.
3. Unit will not lift to full height.
4. Unit still does not operate.
6744
44 TON TRUCK AXLE JACK
ACTION
Purge air from hydraulic system by following procedure under
SETUP.
Purge air from hydraulic system as above.
Purge air from hydraulic system as above or check oil level in reservoir.
Contact Sunex authorized hydraulic service center.
4
MODEL 6744
WITH AIR RETURN
01/08/15