Snap-on Equipment EEWA717A, Operator'S Manual

Page: 23 / 66

Steps to Performing a 4-Wheel Alignment
There are many reasons why a wheel alignment may be performed on a vehicle such as:
Accelerated or uneven tire wear
Pull, wandering, or other steering / handling problems
After replacement of worn suspension or steering system components
After-collision repairs
Routine vehicle maintenance
Regardless of the reasons for alignment, it is important that the technician performs these
Basic steps necessary to address and correct all problems. Other diagnostics are available
for advanced testing.
1. Gather information from the vehicle owner – ask about any drivability symptoms of misalignment. Inquire if
the vehicle has been in a collision or has had any parts replaced recently.
2. Perform a test drive to verify owner’s complaint – try to recreate the problem. If unable to duplicate, have
the vehicle owner explain further or have him/her drive with you.
3. Place vehicle on the alignment lift – center the vehicle on the lift and turntables. Raise the lift to a solid,
level lock position.
4. Inspect the tires for any signs of abnormal wear – tires often reflect any misalignment conditions.
5. Perform a thorough component inspection. Replace defective parts prior to performing the alignment. Always
check tire pressure and ride height.
6. Mount targets and pods to the vehicle wheels. Use the safety straps in the event of grip failure.
7. Perform compensation – the purpose of performing compensation is to eliminate measurement errors due
to the wheel runout and clamp mounting error.
8. Determine what needs to be done – Examine the vehicle and any reference materials to determine the
procedures for angle corrections. Determine what items are needed to correct any problems (i.e. Aftermarket
kits, special tools, etc.).
9. Make any needed angle corrections – center the steering wheel carefully when prompted. Use this order
of adjustment:
a. Rear camber
b. Rear toe
c. Front caster
d. Front camber
e. Front toe
10. Print the results – the printout is useful for showing the customer before and after results. Many shops keep
a printout on file for future reference.
11. Perform a test drive to verify proper alignment.
21