Question

a daily check of track tension is performed _____.
only on machines with metal tracks
only on machines with rubber tracks
only by a factory-trained technician
on machines with metal and rubber tracks

Explanation:

Track tension affects performance and wear for both metal and rubber tracked machines, so daily checks are needed for both. Factory technicians are not the only ones who can perform this basic daily check, and it is not limited to one track type.

Answer:

D. on machines with metal and rubber tracks