Mining machinery parts are fitted with special seals and filters designed to keep dirt and grime out of sensitive areas. If a seal cracks or breaks, it won't properly protect the machinery. Filters that are clogged with excess dirt and grime won't operate well. ... By regular maintenance, you will extend its life and increase its performance.
Personal Property Manual 2011-2012 Prepared by: ... Life Expectancy Guidelines 14 Agriculture and Forestry 14 Mining 15 Utilities 16 Construction 17 Manufacturing 18 ... The appraiser will have to determine from the individual manufacturer the average life of the equipment