Your RangerTrail ® TrailerCONTAINED OIL ORBITAL LUBRICATION (COOL) HUBSCOOL Hubs should be serviced once a year or every 20,000 mileswhichever comes first.1. Jack up the trailer and remove the wheel.2. Remove oil filling plug from COOL hub.3. Turn hub so all oil drains from cavity.4. Add 2.5 - 3 ounces 50 wt motor oil until level is approximately full(up to Max. Fill Line).5. Replace oil fill plug.6. Check oil level before each trip and maintain level to “MAX FILL” lineon center cap.If your trailer has the rubber fill plug in the center of the amber cap, thefollowing procedure is required:7. Remove wheel center if wheel has one. Do not jack up the trailer orremove tire. Using a piece of cardboard and a catch pan, with thecardboard under the amber center cap, remove the center cap andlet oil drain on cardboard into catch pan. Once drained and rubberplug removed from amber center cap, re-install the amber centercap till seated on hub. Fill to bottom of fill hole; wait 10 minutes andrefill to bottom of hole with oil and install rubber plug. This time isneeded for the oil to seep through the bearings so proper level willbe shown.8. Reinstall wheel, tightening lug nuts to 85 ft. lbs.NOTE: It is normal for the oil to change color after a few miles of use.9. Dispose of oil soaked cardboard and used oil in an appropriatemanner.66