DIT160

Front Axles

Elizabethtown Technical College

Front Axles Instructor: Doug Poteet

DIT160

PARTS OF A MANUAL STEERING SYSTEM

AXLE FUNCTION The main function of the front-axle

assembly is to support some of the vehicles weight and to serve as the foundation for the steering components.

CONVENTION CAB TYPE The front axle is designed to carry

about 25% of the gross vehicle weight.

CAB OVER The front axle is designed to carry

up to 35% of the total vehicle weight.

SET BACK For heavy hauling or construction

work, the conventional cab design with a set-back front axle is preferred.

The set-back axle allows greater weight transfer to the front axle, a tighter vehicle turning circle, and a softer ride.

TYPES OF STEER AXLES STANDARD I-BEAM ALUMINUM BEAM TUBULAR CENTER-POINT

Q1-4 Name four different designs of

axles

Q5-7 Name 3 different axle manufatures

Q8-10 Name 3 different ways the axle ID

could be displayed on a axle

STEERING KNUCKLE

COMPONENTS OF A STEERING AXLE

TAPERED KING PIN STRAIGHT KING PIN

INSPECTING VERTICAL PLAY

.001-.025 new

.001-.065 inservice

INSPECTING UPPER BUSHING FREE PLAY

Typically 0.010-.015 max

MEASURING LOWER BUSHING FREE PLAY

Typically 0.010-.015 max

TORQUE DEFLECTION

Typically 0.010-.015 max

INSPECT BEARINGS

INSPECT RACES

R & R SHIMS

NOTE:

TIE-ROD REMOVAL

PICKLE FORK

DRAW KEYS

KNUCKLE PIN REMOVAL

SEAL LIP MUST FACE THE AXLE

DRIVING BUSHINGS

HAND START BUSHING

BUSHING AND SEAL INSTALLATION

PRE-ASSEMBLY LUBE

THRUST BEARING POSTION

THRUST BEARING

VERTICAL PLAY

USE JACK TO SIMULATE LOAD

RTV

KING PIN DRAW KEY ALIGNMENT

DIT160

STEERING