Any excess oil will run out fill hole. Replace filler screw or filler plug when oil has stopped flowing. The Jack could be low on oil- With jack in upright position and ram fully lowered, remove filler screw or filler plug and fill reservoir with clean hydraulic jack oil — correct oil level is reached when oil level is at bottom edge of fill hole. Valve might not be closing- Make certain release valve is closed. Starting with ram in fully lowered posi- tion, SLOWLY raise ram out to full height. Open release valve and push ram down into lowered position. Jack should now operate properly. The jack could be low on oil- With jack in upright position and ram fully lowered, remove filler screw or filler plug and fill reservoir with clean hydraulic jack oil — correct oil level is reached when oil level is at bottom edge of fill hole. 4902A, 4904A, 4906A, 4908A, 4912A, 4913A, 4920A, 4923A rev. 06/20/07...