Measuring with Depth Gauge

• Make sure under surface is clean.
• Measure the amount of material between the rail and the bush as shown in the following diagram

• Place the depth gauge on the bottom of the rail with pin passing directly through the centre of the bush and touching the under surface of the shoe. This is demonstrated in the following image.

• Then measure the Pin length exposed using a ruler as demonstrated below.

Measuring with an Ultrasonic Probe

• Make sure surface is clean of debris, paint, rust and dirt using a scrapper or wire brush.
• Place a small amount of gel on the probe surface then place the probe in the centre of the link, using the centre of the bush as a guide.

To ensure correct measurement is taken, always measure on the inside of the link joins.

If the UT is not returning a reading, gently rotate the probe from left to right until reading is found.