SWEEPING SYSTEMTigerCat, Hydro-Retriever 4500 Service Manual________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________BROOM HOUSING SKIRTSRubber or urethane skirts are installed at the front, back and sides of the broom housing to keep dust anddebris confined during sweeping. For good sweeping performance, all of these skirts must be in good condi-tion and adjusted for proper contact with the floor.Hopper SkirtThe hopper skirt is mounted on the hopper and drags on the floor in front of the main broom. It acts as aramp, to help guide the litter off the floor and into the hopper. It also acts like a check valve, keeping litter frombeing thrown forward by the rotation of the broom.To replace the hopper skirt...1 Raise the hopper about 3 feet (1 meter) and put jack stands under it for additional support.WARNING!Never work under the hopper without jack stands in place to support it.2 Remove the screws holding the skirt on the hopper and install the new skirt in it’s place.Replacing Skirts at Left End of Broom HousingOuter skirt - Remove the (8) “A” bolts (see Figure 3) and the straps holding the skirt in place.FIGURE 3CDInnerEMiddleBOuterAF15