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General purpose (GP) 300's can be either narrow front end or adjustable tread wide front end. Rear tread is adjustable. The utility 300's are all solid axle fixed tread wide front end and fixed rear tread. The 311B is a general purpose tractor built in the 1958 & 1959 model years (1 Oct 57 to 30 Sep 59). 1958 model year starting serial nr 5095001 and 1959 6120001. If you have a triple range gear train then you likely have the optional hand clutch. The hand clutch is operated by a long lever in front of your left knee that enters the bottom of the torque tube just in front of the lower part of the foot clutch pedal. The hand clutch engages/disengages the transmission to start/stop tractor ground travel allowing the pto to continue running I.E. if you were to disengage the foot (engine) clutch both the tractor ground travel and the pto are disconnected from the engine and will stop. If you disengage the hand clutch with the foot clutch still engaged, the transmission is disconnected, ground travel stops but the pto continues to run off the engine clutch. Case billed this as a "constant running pto", being similar in function to but not a true live pto. The pto referenced above is to the pto on the back not the belt pulley. The 311B has flooded rear axles, making the transmission oil capacity about 28 qts. The axles drain into the transmission and out the same drain plug but a build up of gunk in the axles can plug the limber holes so their may not drain very fast or completely. Gunk is associated with water contaminated oil, so you might have to elevate/drain each side in turn. The torque tube hyd reservoir capacity is about 14 qts but allowing for the triple range gear train installed in there it would be reduced to about 13 qts and if hand clutch disc pack is present reduced further to about 12 qts. Joe
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