ASE T5 Suspension & Steering (Medium/Heavy Truck) study guide
ASE T5 Suspension & Steering (Medium/Heavy Truck) · Work through your exam, one topic at a time.
ASE T5, formally the Medium-Heavy Truck Suspension and Steering certification, is one of the ASE truck series credentials that identifies a technician as competent in the systems that keep a commercial vehicle tracking straight, riding correctly, and coupling safely. It is aimed at working technicians in fleet shops, dealerships, and independent garages who service Class 3 through Class 8 trucks, plus vocational students preparing to enter those roles. The ASE T5 Suspension & Steering (Medium/Heavy Truck) study guide has 6 sections and about 1,871 words.
01Steering Systems Diagnosis and Repair
Medium- and heavy-duty trucks use an integral recirculating-ball power steering gear with a rotary control valve built into the gear, or a linkage-type assist cylinder. The pump does two separate jobs: its flow control valve sets steering response (how fast the wheels move for a given steering wheel input), and its relief valve caps maximum assist pressure.
353 words, about 2 min02Suspension Systems Diagnosis and Repair
Leaf spring suspensions (multi-leaf, taper-leaf, parabolic) locate the axle through spring eyes, shackles, hangers, U-bolts, and center bolts; tandem tractors often add an equalizing beam. Every rubber bushing in that chain is a wear point, and a worn shackle or spring-eye bushing lets the axle steer, producing wander and a pull that changes with load.
324 words, about 2 min03Wheel Alignment Diagnosis, Adjustment, and Repair
Alignments revolve around caster, camber, toe, and thrust angle, with secondary angles (SAI/KPI, included angle, scrub radius, turning angle) used mainly for diagnosis. On a solid I-beam front axle camber is built in and not adjustable; toe is the routine adjustment, made at the tie rod or drag link.
302 words, about 2 min04Wheels and Tires Diagnosis and Repair
Know the two mounting systems cold. Hub-piloted wheels center on the hub bore and use flanged nuts with flat faces; stud-piloted wheels center on the studs and use ball-seat nuts.
299 words, about 1 min05Frame, Fifth Wheel, and Coupling Devices
Frame diagnosis starts with a clean rail. Look for cracks at crossmember attachments, spring hangers, and bracket welds, and for shiny or rust-streaked areas that indicate movement.
302 words, about 2 min06Cab Suspension and Related Components
Most highway tractors use a four-bag air cab suspension with shocks and a height control valve, or a spring-and-shock arrangement. The system's job is isolation: the cab should float without bottoming or leaning.
291 words, about 1 min