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Heavy Duty Diesel Suspension and Steering

HDD 205

Heavy Duty Diesel Suspension and Steering

HDD 205

Course Description

Prerequisite: HDD 151 with a grade of "C" (2.0) or better. Corequisites: HDD 202 and HDD 206. Introduces inspection and maintenance of heavy duty diesel suspension and steering systems. Practices the service of HDD suspension and steering systems. Practices NATEF tasks related to HDD suspension and steering systems. (60-30)

Outcomes and Objectives

Complete NATEF tasks related to heavy duty diesel Steering Systems as listed below.

Objectives:

  • Steering Column
  • Steering Units
  • Steering Linkage

Complete NATEF tasks related to heavy duty diesel Suspension Systems as listed below.

Objectives:

  • Inspect front axles and attaching hardware; determine needed action.
  • Inspect and service kingpins, steering knuckle bushings, locks, bearings, seals, and covers; determine needed action.
  • Inspect shock absorbers, bushings, brackets, and mounts; replace as needed.
  • Inspect leaf springs, center bolts, clips, pins and bushings, shackles, U- bolts, insulators, brackets, and mounts; determine needed action.
  • Inspect axle aligning devices such as radius rods, track bars, stabilizer bars, torque arms, related bushings, mounts, shims, and cams; determine needed action.
  • Inspect tandem suspension equalizer components; determine needed action.
  • Inspect and test air suspension pressure regulator and height control valves, lines, hoses, dump valves, and fittings; adjust, repair or replace as needed.
  • Inspect air springs, mounting plates, springs, suspension arms, and bushings; replace as needed.
  • Measure and adjust ride height; determine needed action.
  • Identify rough ride problems; determine needed action.

Complete NATEF tasks related to heavy duty diesel Wheel Alignment Diagnosis, Adjustment, and Repair as listed below.

Objectives:

  • Identify causes of vehicle wandering, pulling, shimmy, hard steering, and off-center steering wheel problems; adjust or repair as needed.
  • Check camber; determine needed action.
  • Check caster; adjust as needed.
  • Check and adjust toe settings.
  • Check rear axle(s) alignment (thrustline/centerline) and tracking; adjust or repair as needed.
  • Identify turning/Ackerman angle (toe-out-on-turns) problems; determine needed action.
  • Check front axle alignment (centerline); adjust or repair as needed.

Complete NATEF tasks related to heavy duty diesel Wheels and Tires as listed below.

Objectives:

  • Identify tire wear patterns; check tread depth and pressure determine needed action.
  • Identify wheel/tire vibration, shimmy, pounding, hop (tramp) problems; determine needed action.
  • Remove and install steering and drive axle wheel/tire assemblies; torque mounting hardware to specifications with torque wrench.
  • Inspect tire for proper application, (size, load range, position, and tread design); determine needed action.
  • Inspect wheel/rims for proper application, hand hold alignment, load range, size, and design; determine needed action.
  • Check operation of tire pressure monitoring system (TPMS); determine needed action if applicable.

Complete NATEF tasks related to heavy duty diesel Frame and Coupling Devices as listed below.

Objectives:

  • Inspect, service, and/or adjust fifth wheel, pivot pins, bushings, locking mechanisms, and mounting hardware.
  • Inspect and service sliding fifth wheel, tracks, stops, locking systems, air cylinders, springs, lines, hoses, and controls
  • Inspect frame and frame members for cracks, breaks, corrosion, distortion, elongated holes, looseness, and damage; determine needed repairs.
  • Inspect, install, or repair frame hangers, brackets, and cross members in accordance with manufacturers’ recommended procedures.
  • Inspect, repair, or replace pintle hooks and draw bars, if applicable.