HI CAN YOU HELP I HAVE A DAVIID BROWN 1210 AND IT IS MY FIRST TRACTOR I HAVE DONE A SERVICE ON IT BUT I CANT FIND A SERVICE MANUAL TO HELP SO I CANT TELL IF I AM PUTTING IN TO MUCH OIL IN THE GEAR BOX OR WHAT OIL TO USE I HAVE FOUND A GLASS ON THE SIDE OF THE GEAR BOX WITH A RED DOT IN THE MIDDLE AND THE OIL IS HALF WAY UP THE GLASS I TAKE IT THAT MEANS IT IS HALF FULL HOPE SOME ONE CAN HELP WITH ANY INFO ON THIS OR ANY THING ELSE I SHOULD BE LOOKING FOR THANKS COLIN 