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Chaps, I have used and maintained a 63 FSM for the last few years. I have filled the gearbox and rear axle with SAE 90 gear oil. This very thick and was the original spec for this application according to the workshop manual. To fill both takes about 60 litres (don't have the book to hand sorry) The filler for the rear axle/hydaulics is behind the seat and the dipstick near to the cluth pedal is the level for this section. The filler/levelplug for the transmission is near to the clutch pedal. The level is marked on the vertical flat in front of the plug as you look at it. Make sure the breather for the transmission is clear as the oil will expand when hot. The breather is the large headed bolt that holds on the battery tray steering box bracket and sometimes the earth strap for the battery. If this is blocked then the casing could crack due to the pressure build up. Another thing to note is that in my experience on my machine which used to be fitted with a fore end loader so the hydraulic pump may well be worn. The hydraulics will not work if run on universal hyadrauic oil in hot conditions even though the book says that it should work. I guess the pump has trouble picking up this thin oil. My machine is very quite even at road speeds. Obviously if you have a bearing problem the correct oil will not solve the problem! Hope that helps to clarify the oil situation. Simon
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