For the last few days we are facing problem of clinker cooler 1st drive (hydrolic) stroke lengthwhich is(125 mm originally) varies from 100 to 120mm means for few time it is running 100 mm some time 110 and 115 and so on. I want to know

1- Why it is happening?

2-What will be impact on operation?

3-Will it reduce cooler efficiency?