Final answer:
Adjusting the struts of a screw jack system manually can place the worker in dangerous positions or situations, posing a risk of workplace injuries. Safety protocols are essential to ensure safe operation.
Step-by-step explanation:
The struts of a screw jack system must be adjusted manually, which creates a hazard because the worker is required to place themselves in potentially dangerous positions or situations while making the adjustments. Such manual adjustments may involve being under a heavy load or in close proximity to moving mechanical parts. Maintaining a screw jack system requires adherence to safety protocols to mitigate risks associated with manual adjustments and prevent workplace injuries.