Caster reading – MAHLE RTI Laser 4 User Manual

Page 18

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Page 18

CASTER READING

Caster: The backward or forward tilt of the ball joint or strut at the top

Caster is measured in degrees:

Spindle support arm straight up and down on the true vertical:

Zero Caster

Spindle support arm is tilted forward at the top from true vertical:

Negative Caster

Spindle support arm is tilted back at the top from true vertical:

Positive Caster

A vehicle with Positive Caster is shown in Fig. 15.

Proceed with the following steps to read Caster:

1)

With the Electronic Gauge mounted on the left
front wheel clamp, turn the left front wheel
outward at the front for a 20 degree reading on
the radius gauge. (See Fig. 16)

2)

Turn the Electronic Gauge so it is level.

3)

Set the selector to CASTER. Press the Zero
Button. (See Fig. 17)

4)

Turn the wheel inward at the front for a 20 degree
reading on the radius gauge. This is a total swing
of 40 degrees.

5)

Turn the Electronic Gauge so it is level.

6)

Read Caster on the Digital Readout Scale (A
positive 1.0 is indicated in Fig.18). The numeric
reading will be preceded by a + or - to indicate
positive or negative Caster.

7)

Repeat the above procedure on the right front
wheel.

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