Steering Gears Application Guide - CARQUEST Auto Parts

16−POWER STEERING GEARS Sheppard Troubleshooting GuideSYMPTOM POSSIBLE CAUSE REMEDYOil in reservoir foamingAir leak in suction side of supply pumpPump cavitatingOil overheatingIncorrect lubricantRefer to pump servicing instructionsCheck for restriction in pump supplySee high operating temperaturesChange to 10W40 motor oilNo power steering on cold startHydraulic supply pump vanes not extending(Vane type pump only)Increase engine speed momentarily to extendvanes and start pump action. Usually atemporary and infrequent occurence andnot cause for pump repair or replacementExcessive pump pressure withsteering gear in neutral positionPinched oil return lineHigh back pressureBinding steering columnDamaged actuating shaft bearingRelocate lineRepair steering columnReplace damaged parts as requiredWheel cuts restricted Relief plungers misadjusted Adjust relief plungers (See Final Adjustmentssection)Erratic steering or mechanical steeringonlyInsufficient volume of oil being meteredby flow divider to steering gear inducedby foreign particles on flow divider valve,causing the valve to hang up in the borePolish flow divider valve to remove foreignparticles and burrsHard steeringLoose beltsWorn pully(s) due to belt slippingFaulty supply pumpFront axle overloadedFaulty steering geometryHigh operating temperatureTighten or replace beltsReplace pully(s) and belts (keep belt tight)Follow "Hydraulic Supply−Diagnosis"proceduresCorrect loading practicesAlign front endLocate and correct cause of overheatingWheel turns hard in one or bothdirectionsBent or damaged king pins and tie rodsFront end load too great for rated axlecapacityFatigued by−pass valve spring in pumpLow oil level in steering systemAir in systemMetal or foreign material caught in actuatingvalveActuating valve worn or chipped by dirtRepair or replace king pins and tie rodsLighten load or install larger steering gearReplace with flow control valve pumpassemblyFill oil reservoir as requiredBleed system and check for cause of air(See Final Adjustments Section)Remove actuating valveClean and check parts for damageIf damage is excessive replace damagedparts as required.Wheel steering hard in one directionBroken reversing springs in steering gearMetal or foreign material in relief ball seatin piston of steering gearForeign material in relief valveReplace reversing springs and damagedpartsRemove piston and clean relief valve seatsor replace damaged partsClean relief valveSteering extremely light in one orboth direction(s)Bent or damaged reversing springsCheck for impact or accident damageReplace damaged parts16 − 32