1993 GMC Jimmy Owner's Manual - Page 340

Scheduled Maintenance Services 13. ENGINEACCESSORYDRIVEBELTINSPECTION*-Inspectbelt.Look or replaceas forcracks,fraying,wear,andpropertension.Adjust needed. 14. TIREANDWHEELROTATIONANDINSPECTION -For properwear 6,000 miles (10 000 and maximum tire life, rotate tires at the first kilometers)forSchedule I or 7,500 miles (12 500 kilometers)for Schedule II andthenevery 15,000 miles (25 000 kilometers)thereafter. Followtheinstructionsandpatternsshown in Section 6. Checktires for uneven wear or damage. If irregular or premature wear is apparent, checkwheelalignment. Also, checkfordamagedwheels.See"Tires" in theIndexfor more information, 15. DRIVEAXLESERVICE-Checkreadfrontaxlefluidlevelandaddas needed.Checkconstantvelocityjointsandaxlesealsforleaking. Lockingdifferential -Drainfluidatfirstoilchangeandrefill.Check fluidlevelandaddasneededatsubsequentoilchanges.Industy areas or trailer towing applications, drain fluid atevery 15,000 miles (24 135 kilometers)and refill,t Standarddifferential -Checkfluidlevelandaddasneededat every oilchange. In dustyareas or trailertowingapplications,drain fluidevery 15,000 miles (24 135 kilometers)andrefi1l.t Morefrequentlubricationmayberequiredforoff-roaduse. 16. BRAKE SYSTEMINSPECTION-Whentheengineoil is changed, inspectthelinesandhosesforproperhookup,binding,leaks,cracks, chafing,etc.Checktheparkingbrakeadjustment,andthefluidlevel in the mastercylinder. A low fluid level can indicate worn disc brake pads which may need to be serviced.t Whenthewheelsareremovedforrotation,inspectdiscbrakepadsfor wearandrotorsforsurfacecondition. Also inspectdrumbrakelinings wearandcracks.Inspectotherbrakeparts,includingdrums,wheel cylinders,parkingbrake,etc.,atthesametime. for Inspectbrakesmoreoften if drivinghabits or conditionsresult in frequentbraking. t A fluid loss in thesesystems may indicateaproblem.Havetheminspected andrepairedatonce. 7-1 0