Sealey GA70 - Manual (Page 3)

fig.6
5.2 cHEcKInG toE on front WHEELs refer to fig.7
5.2.1 now that you have aligned front wheels with rear wheels, (using
5.1.5 instructions) you next have to check your toe readings on
the front laser measuring head scales.
5.2.2 to obtain the toe, a small calculation is required. the reason for
this is because you cannot ensure that both the o/s/f and
n/s/f laser heads are positioned 100% equal to each other
when fitted to the wheels.
5.2.3 rules for calculation
If both lasers are hitting in the same colour zones, you have to
add them together to obtain the vehicle's toe.
Example 1:
o/s/f scale n/s/f scale
- 1 red -2 red (Your toe is currently -3 toe out)
Example 2:
o/s/f scale n/s/f scale
+ 1 Green + 2 Green (Your toe is currently +3 toe in)
If the lasers are hitting in two different colour zones, you have to
subtract the lesser number from the higher number.
Example 3:
o/s/f scale n/s/f scale
- 3 red + 4 Green (Your toe is currently + 1 toe in)
If the lasers are hitting in different colour zones but have
equal readings, then the toe is 0.
Example 4:
5.3 ADJustInG toE
now that you have obtained the vehicle's toe using 5.2
calculations, you may now need to adjust the toe according to
the manufacturer's specifications.
When adjusting track rod ends, you must make sure you
adjust equally on both sides. so if you adjust half a turn on the
o/s/f then you must adjust half a turn on the n/s/f. once you
have obtained the desired toe, using the calculations, you
must then check the rear flags to see whether they have equal
readings on both sides.
Please note: If you have adjusted the toe then the rear flag
reading will have changed from what you had originally set
them to in step 5.1.5. If they are still equal then the job is
complete.
If the rear flags are not equal then this would suggest you
have not adjusted the o/s/f and n/s/f track rod ends equally
when adjusting the toe, or the thrust angle is not equal on the
rear wheels in relation to the centre line.
fig.7
5.1.5 turn on both front laser measuring heads. now look to rear flags,
refer to fig.6, you will have a reading on both sides, (the
readings may not be the same). If you have two different readings
on the rear flags, this means you now have to adjust both front
track rod ends. You are now ensuring that the front wheels are in
line with the rears.
the first step to achieving this, is to add both rear scale readings
together and divide by 2.
for example:
n/s/r reading 2 o/s/r reading 4 (2 + 4 = 6 ÷ 2 = 3)
You now need to adjust both front track rod ends until you achieve
3 on both rear flags.
6. MainTenanCe
6.1. After use, always secure all tools and measuring units back
onto the mobile storage unit to minimise damage.
6.1.1. If a laser beam becomes difficult to see on the gauge, the
batteries in question may need changing.
6.1.2. to replace the batteries, slide back the battery covers on the
laser alignment unit to reveal the battery compartments and fit
new batteries. Dispose of old batteries correctly (see Battery
removal section on next page). refit the covers.
6.1.3. Periodically clean all the measuring units and tools with a
slightly dampened cloth.
6.1.4. the lasers should be calibrated on a yearly basis and in
particular if the units are damaged and there is doubt that the
laser heads are still in alignment. contact your sealey dealer
to arrange returning the unit for re-calibration.
6.1.5 Alternatively, a calibration rig (Model no: GA70cr) is available
for purchase if required.
Original Language Version Original Language Version GA70.V2 Issue: 1- 19/02/14 © Jack sealey Limited