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5.2.
CHECKING TOE ON FRONT WHEELS Refer to fig.7
5.2.1
Now that the front wheels are aligned with rear wheels, see section 5.1.5, next check the 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, add them together to obtain the vehicle's toe.
Example 1:
O/S/F Scale
N/S/F Scale
- 1 Red
-2 Red (Toe is currently -3 toe out)
Example 2:
O/S/F Scale
N/S/F Scale
+ 1 Green
+ 2 Green (Toe is currently +3 toe in)
If the lasers are hitting in two different colour zones, subtract
the lesser number from the higher number.
Example 3:
O/S/F Scale
N/S/F Scale
- 3 Red
+ 4 Green (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:
O/S/F Scale
N/S/F Scale
- 2 Red
+ 2 Green (0 toe).
5.3.
ADJUSTING TOE
5.3.1. Now that the vehicle's toe has been obtained using section 5.2 calculations, it may be necessary to adjust the toe according to the
manufacturer's specifications.
5.3.2. When adjusting track rod ends, make sure to adjust equally on both sides. If it needs to be adjusted half a turn on the O/S/F then it
needs to be adjusted half a turn on the N/S/F. Once the desired toe is obtained using the calculations, then check the rear flags to see
whether they have equal readings on both sides.
5.3.3. NOTE: If the rear toe has been adjusted, the rear flag reading will have changed from the original, set in section 5.1.5. If they are still
equal then the job is complete.
5.3.4. If the rear flags are not equal then this would suggest the O/S/F and N/S/F has not been adjusted, 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.
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 stockist to arrange returning the unit for re-calibration.
6.1.5. Alternatively, a calibration rig (Model No: GA70CR) is available for purchase if required.
© Jack Sealey Limited
fig.7
Original Language Version
GA70.V2 | Issue 2 06/06/2019
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