Section 4.Scheduled Maintenance Model 4700 Maintenance Manual

Fork Inspection

If there is greater than 10% wear of the fork arm, the fork has at least a 20% reduction in capacity.

NOTE : The caliper is designed to measure forks up to 4 in. (100 mm). It is not to be used on full or lumber tapered forks. For these forks, you must know the original fork blade thickness and take a measurement of the fork arm thickness. If the difference in the measurement exceeds 10% of the original thickness, the fork must be removed from service.

3.Measure 2 in. (50 mm) out from the heel of the fork.

4.Place the caliper over the flanks of the fork arm blade at this 2 in. (50 mm) point. See Figure4-6.

Fork Hooks

1.Remove the forks from the carriage.

2.Determine the fork mounting class.

a.Measure the height of the carriage or the distance between the hooks. See Figure4-7.

5.If the inside teeth of the caliper hit the fork, there is <10% wear. If the inside teeth pass freely over the fork arm, there is >10% wear and the fork must be removed from service.

b.Compare this measurement to the table below.

3.Locate the correct extruded edge on the caliper for the fork mounting class. See Figure4-8.

Publication 1160093, Issued: 20 May 2013

4.Slide the extruded edge up into the fork pocket. See Figure4-8.

5.If the caliper’s extruded edge completely slides up into the fork pocket, remove the fork from service. See Figure4-8.

Markings

Make sure the fork’s marking (individual load rating) is legible (typically located on side of fork). If fork marking is not legible, remove the fork from service.

Publication 1160093, Issued: 20 May 2013