The connections may only need tightening to eliminatePOWER STEERINGleaks; however, leakage may occur at various points inthe power steering unit if the seals are defective.Power steering (fig. 3-2) adds the followingDocument conditions and report them to the mainte-components to the steering assembly: a hydraulic pump,nance shop for replacement of any defective seal.a fluid reservoir, hoses, lines, and a steering assist unitwhether mounted on the linkage or incorporated in theThe types of steering troubles that develop insteering gear assembly.vehicle operations that should be documented andturned in for repair are as follows:ARTICULATED STEERINGlllllllExcessive play in the steering systemHard steeringVehicle wandersVehicle pulls to one side when brakingFront-wheel shimmyFront-wheel tramps (high-speed shimmy)Steering kickbackTires squeal on turnsImproper tire wearUnusual noisesHydraulic power is used to turn a whole section ofa machine on a vertical hinge. This design is calledarticulated steering and it is controlled by a steeringwheel, a hydraulic control valve, and hydrauliccylinders. (See fig. 3-3.) The pivot is midway in thevehicle, so both parts share equally in the pivoting. Thisaction produces the effect of four-wheel coordinatedsteering, such as the front-and-rear wheels run in eachothers tracks, backward and forward.FRONT-AND-REAR STEERINGWheeled equipment may be designed to steer byangling the front wheels, the rear wheels, and or bothThese problems must be documented and turned inthe front-and-rear wheels (fig. 3-4). Front-wheelfor repairs.steering is the standard method. The vehicle follows theFigure 3-2.-Power steering linkage assembly.3-2
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