In addition, the PMs that are copie

In addition, the PMs that are copied from machine manuals are not usually applicable because of the following:
(1) each machine works in a different environment and would therefore, need different PMs;
(2) machines designers often do not have the same experience of machines failures, and means of prevention, as those who operate and maintain them; and
(3) machine vendors may have a hidden agenda of maximizing spare parts replacements through frequent PMs.

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Selain itu, PMs yang disalin dari mesin manual tidak biasanya berlaku dikarenakan hal berikut:(1) setiap mesin bekerja di lingkungan yang berbeda dan akan demikian, perlu berbeda PMs;(2) mesin desainer sering tidak memiliki pengalaman yang sama dari kegagalan mesin, dan sarana pencegahan, sebagai orang-orang yang mengoperasikan dan memelihara mereka; dan(3) mesin vendor mungkin memiliki agenda tersembunyi memaksimalkan cadang penggantian melalui sering PMs.