Road Test
Article No.94-20-13
10/15/94
THE ROAD TEST
Test drive the vehicle with the customer to understand the pull or drift concern. Sometimes they may mistakenly call a clear vision concern a pull or drift concern because the steering wheel is not straight.
^ The road test should be done on a flat, straight road (with no crown) and should be done in both directions to account for wind.
^ Tire pressure should be checked and adjusted, if necessary.
^ On trucks with automatic locking hubs, it is necessary to drive 20 ft (6 meters) forward and then 10 ft (3 meters) backward to unlock the hubs.
NOTE:
IT IS POSSIBLE THAT THE TRUCK MAY HAVE MULTIPLE SYMPTOMS. A FLOW CHART (FIGURE 5) AND ROAD TEST ACTION PLAN FOLLOWS.
ROAD TEST
A Diagnostic Check List has been provided to use with this procedure.
NOTE:
THIS TSB ARTICLE SHOULD BE READ COMPLETELY BEFORE PERFORMING DIAGNOSTICS OR REPAIRS.
To ensure proper steady-state drift evaluation, accelerate the truck and decelerate the truck using ENGINE BRAKING ONLY.