15.2.24. Buckets or grabs of power shovels should be fixed to
restrict movement while they are being repaired or teeth are being
changed.
15.2.25. When an excavator is at work near a wall or similar construction, persons should be prevented from entering the danger zone in which they may be crushed when the machine pivot.
15.2.26. Trucks should not be loaded in any place where
there may be danger from materials such as rocks falling from
buckets passing overhead; where this cannot be avoided, no person
should remain in the cab during loading.
15.2.27. Trucks should be stationed at such a distance from
the excavator that there is a clearance of at least 60 cm (2 ft) between
the truck and the superstructure of the excavator even when it pivots.
15.2.28. While work is being done on hydraulically operated buckets the piston should be fully drawn back in the hydraulic
cylinder.