1999 GMC Sierra 1500 Pickup Owner's Manual - Page 398

Scheduled Maintenance Services Explanation Of Scheduled Maintenance Services Below are explanations of theserviceslisted in themaintenancecharts. Theproperfluidsandlubricants to use are listed in thissection.Makesure whoeverservicesyourvehicleusesthese.Allpartsshouldbereplacedand all necessaryrepairsdonebeforeyouoranyoneelsedrivesthevehicle. -ALWAYSUSE SG OR 1. ENGINEOILANDOILFILTERCHANGE* SGKE QUALITY,ENERGYCONSERVING II OILS OF THEPROPER VISCOSITY. To determine the preferred viscosity oil for your vehicle's engine (e.g.SAE5W-30 or10W-30),see"EngineOil" in theIndex. 2. CHASSISLUBRICATION -Lubricate thefrontsuspension,king pin bushings,steeringlinkage,transmission,andtransfercaseshiftlinkage, parkingbrakecableguides,propshaftsplines (2wheeldrive),brake pedal springs,and clutchpedalspringsattheintervalsspecified. If youhavea 3500 HD, lubricatethekingpinsandkingpinbushings every1,500miles (2500 km)forMaintenanceSchedule1,orevery3,000 (5000 km) forMaintenanceSchedule 2. Balljointsandking pin bushings should notbelubricatedunlesstheir is cold,let temperatureis 10°F (-12"C), or higher.Whentheweather themwarmupbeforelubricationortheycouldbedamaged. Also,besuretocheck all the vehicle fluid levels at this time. 3. CLUTCHFORKBALLSTUDLUBRICATION -Lubricate theclutchfork ballstudthroughthefitting on theclutchhousing.Lubricantmustbe to added"sparingly" to thefitting,as only. 0066 Ib.(.003kg)isrequired Do notaddlubricant more oftenthanthe lubricatetheballstudsurface. intervals in theMaintenanceCharts. Too muchlubricant will damage theclutchassembly. 4. ENGINEIDLESPEEDADJUSTMENT(DIESELENGINES)* -Adjust thespecificationsshownontheunderhoodlabel. Youmustuse calibrated test equipment. 5. COOLINGSYSTEMSERVICE* -Drain, flushandrefillsystemwithnew coolant.See"EngineCoolant'' in the Indexforthepropercoolantand mixture to useinyourvehicle. to if theyarecracked,swollen,or Alsoinspect the hosesandreplacethem deteriorated.Tightenallhoseclamps(exceptconstanttensionclamps). Removedebrisand clean theoutside of theradiatorandairconditioning condenser.Wash theradiatorneck. To ensureproperoperation,pressure testtheradiatorand cap. * AnEmissionControlService 7-1 8