pump is making noise and creeping up and not responding at all sometimes. seems like getting preasure/fluid then not appears to be starving for oil...has 675 hrs. it always had some noise in pump just when lifting only. but always worked befor!!! had 3 yrs now and just put pto seal in. it has lots of fluid,not low at all. dont have any manual or book..does this have a pick up strainer/screen at all and if were location. Filter location? have looked but seem to see any. Any help would be great..and or a location to find something on this on the Net. This could be just a simple problem or a total replacement of pump that I dont need at this time..