Central Hydraulics 37555 - Maintenance and Care; Routine Maintenance and Cleaning; Hydraulic System Service

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MAINTENANCE
1. Clean and lubricate all moving parts including gears, ratchets, and shafts to insure
safe operation. When not in use, keep clean, dry, and covered.
2. Purgeairfromhydraulicsystemwhenjackdoesnotliftefciently.
3. Replace hydraulic oil once per year.
Purging Air from the Hydraulic System
Note: Occasionally, air bubbles can become trapped inside the hydraulic system thereby
reducingtheefciencyofthejack.Purgeairfromthesystemasneeded.
1. PlacetheslottedendoftheJackHandle(21)overthevalvereleasescrew.
2. Turnthevalvereleasescrew(notshown)1-1/2turnscounterclockwiseusingtheJack
Handle.
3. RemovetheoilllerplugonthesideoftheJack(notshown)bygentlypullingand
turning.
4. Rapidly pump the Jack Handle several times to purge air from the hydraulic system.
5. Turn the valve release screw clockwise until snug using the Jack Handle.
6. Replacetheoilllerplug.
Replacing Hydraulic System Oil
Caution: Replace the oil once per year, or more often with heavy use. Do not permit dirt or
any substance other than high quality hydraulic jack oil to enter the hydraulic system.
Do not mix different kinds of oil together.
1. RemovetheJack(12)fromtheliftandplaceinanuprightposition.
2. Completely lower ram.
3. Removetheoilllerplug(notshown)fromtheJack.
4. Fillwithhigh-qualityhydraulicjackoiltothelowerrimofthellhole.
5. Purge air from the system as previously described.
6. Top off with more hydraulic jack oil.
7. Replacetheoilllerplug.