JHCBC JH UNDERVEHICLE MAINTENANCE Visual Inspection is a good place to start. Leaks are a warning of things to come. Everything under the chassis will eventually stop your car if they fail. Preventative maintenance goes a long way!!!!! JH

CBC JH TIRES TIRE STRUCTURE –MAIN ELEMENT IS STEEL WIRE BEADS –TIRE CARCASS OR CASING –PLIES AND BELTS –TREAD (RIBS AND GROOVES) –INNER LINER

JHCBC JH TIRE DESIGN THREE BASIC CONSTRUCTION DESIGNS –BIAS –BELTED RADIAL –BELTED BIAS –FOOTPRINT CONTROLLED BY DESIGN

JHCBC JH TIRE RATINGS AND DESIGNATIONS RATING DETERMINES AMOUNT OF LOAD A TIRE CAN HANDLE TIRES ARE IDENTIFIED BY PROFILE, ASPECT RATIO, SIZE AND LOAD RATING. U.S.. AND METRIC SYSTEM TIRE DESIGNATIONS

JHCBC JH Tire Information is required by law –Size of tire –max inflation pressure –Max Load rating –generic name of material –Number of plies on side and tread –If tubeless or tube type –Radial designation if applicable –DOT manufacturing code SIDEWALL INFORMATION

JHCBC JH TIRE SERVICE INSPECT TIRES ROTATE TIRES R & R TIRES BALANCE TIRES REPAIR LEAKS

JHCBC JH SUSPENSION SYSTEM Suspension System supports weight of car Most systems have same basic parts –Frame –Springs –Control Arms –Shock Absorbers –Tires

JHCBC JH FRONT SUSPENSION Several types of suspensions –SLA –MacPherson Strut Front Suspension –Torsion Bar suspension –Modified SLA with upper spring Suspension system has many parts –Ball Joints, control arms, springs, Stabilizer bars, –Suspension system must be lubricated regularly

JHCBC JH REAR SUSPENSION Trailing Arm rear suspension Rigid Rear suspension Independent Rear suspension Rear suspension use different type of springs and anti-sway bars.

JHCBC JH SUSPENSION MAINTENANCE Lubricate joints –Chassis Grease Inspect for wear R & R shocks Inspect for leakage

JHCBC JH SHOCK ABSORBERS Hydraulic operation Gas filled operation Located on all four corners of a vehicle Shock Absorber Ratio –Determines rate of compression and extension

JHCBC JH STEERING SYSTEMS Two Main types of steering systems –Recirculating Ball Type steering gear –Rack and Pinion steering gear Maintenance is limited to checking lube level on Recirculatig ball type and visual inspection on Rack and Pinion Also, must keep Power steering level filled if applicable.

JHCBC JH Steering Linkage Contains many parts and so must insure all are in good shape. Must lubricate linkage when neccesary Can cause accidents if excessive play is apparent