1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 102Get this manual
BODY, STEERING AND SUSPENSION FOXTM Shock Maintenance 28Support shock with one hand and strike top shock eye with soft face hammer two to three timesThis will force oil through the valve piston and push remaining air out29Unscrew bearing cap and lift rod slowly upward, adding oil as necessary to keep the valve piston assembly submerged in oilIMPORTANT: Do not allow valve piston assembly to come out of the oil
30Add oil as rod is lifted upward until valve piston is just below threads in shock bodyfill shock completely and wrap shop cloth around the shock bodyIf air bubbles are present, wipe them away or push them over the edge of shock body