Hi Deepak
Input is available of Services used for repaid and maintenance of machines used in production
http://teachoo.com/657/211/Definition-of-Input-Service/category/Input-Services/
Also spare parts of machines are capital goods and cenvat available of them also
http://teachoo.com/649/210/Definition-of-Capital-Goods-in-CCR/category/Capital-Goods/
However,repairs of fsctory building etc or office repairs should not be taken