I just wanted to ask the veterans of this forum about maintaning plows. I have been plowing for a few years now but it was always with someone elses trucks. I now have a 88 ford/fisher 7.5 and a 99 ford/fisher 8' min. mount. I have the truck maint down fine but how/how often do you guys change fluid/filters in the pumps. Should i just have a fisher dealer do it or is it pretty easy?? thanks for the help. This place is great!!!!