Fig.1 – Sealey GA70 User Manual

Page 2

4.1. Accurate four wheel alignment should always take place with

reference to the vehicles centre line to avoid problems similar

the one shown in fig.1 where the vehicle will steer to the left

resulting in the steering wheel having to be turned to the right

to compensate. Basically, rear wheel tracking must be kept

equal to the centre line and correctly toed in or out according to

the vehicle manufactures specification in order for the vehicle

to handle correctly. check thrust lines are equal to centre line

before proceeding.

Prior to use, check that the tyre pressures are correct and if

wheel covers are fitted, remove them. Ensure that the vehicle is

on a smooth level surface with the wheels pointing straight

ahead.

Do noT reverse the vehicle into position, but drive straight

ahead into position. Ideally vehicle should be on a ramp or lift

for easier access to the track rods, if adjustment is necessary.

5.1 front to rEAr WHEEL ALIGnMEnt.

5.1.1 Place both dished turn plates in front of the front wheels, with

their curve facing downwards. Drive the vehicle onto the turn

plates, ensuring they are central to the wheels (see fig.2).

5.1.2 set steering wheel in straight ahead position and lock using the

steering wheel clamp, (see fig.3).

5. oPeraTion

4. Four wheel alignMenT

5.1.4 Hang the alignment assembly flags onto the top of the rear tyres

and make adjustments, so that the horizontal bar is sitting at

approximately the centre of the wheel and touching the tyre at

both ends. Ensure that the scale is at 90° to the wheel. check the

spirit level to ensure the correct position is achieved, (see fig.5).

fig.3

fig.2

fig.4

fig.5

5.1.3

Hang both laser measuring heads on the front wheels with toe

scales positioned to the front of the vehicle, (see fig.4). Note:

Extension bobbins are used for vehicles that have dished

wheels (eg 4x4 or vans) where the silver bobbins won't reach

onto the wheel rim. The Extension Bobbins fit over the silver

bobbins to give an extra 40mm of reach. note: use 13" Wheel

spacers under the Laser Measuring Heads when necessary.

Original Language Version

GA70.V2 Issue: 1 - 19/02/14

fig.1