In general, lubricants are classified according to their thickness, and they range from the light oil used for typewriters and sewing machines to grease so thick that it may be cut like butter. The thinnest oil is used for the circuit breaker pivot; this part is usually moved in one direction by a cam and in the other by a light spring. A thick oil would gum the bearing to such an extent that the spring might not be able to move the lever. [Illustration: FIG. 73.—“MOGUL” OILING DIAGRAM] ----+----------------------+----------------------------+----------- KEY | DESCRIPTION | QUANTITY |LUBRICATION ----+----------------------+----------------------------+----------- ONCE EVERY HOUR ----+----------------------+----------------------------+----------- L | Rear axle bearing | Two complete turns | Cup Grease ----+----------------------+----------------------------+----------- ONCE EVERY TWO HOURS ----+----------------------+----------------------------+----------- A | Differential hub | One complete turn | Cup Grease B | Rear wheel hub | One complete turn | Cup Grease C | Differential pinion | One complete turn | Cup Grease H | Front wheel hub | Two complete turns | Cup Grease T | Governor and cam | Two complete turns | Cup Grease | shaft bearing | | ----+----------------------+----------------------------+----------- TWICE EVERY DAY ----+----------------------+----------------------------+----------- E | Governor | Oil | Cylinder | | | oil F | Outboard bearing | Two complete turns when | Cup Grease | grease cups | plowing | G | Transmission | One pint | See note | | | below |{ Magneto trip | Grease every 5 hours | Cup Grease N |{ Magneto roller and | Oil every 5 hours | Oil |{ slide | | J | Steering worm | Keep covered | Cup Grease W | Steering hub grease | One complete turn | Cup Grease | cups | | V | Steering worm shaft | Oil every 5 hours | R | Lubricator eccentric | Oil every 5 hours (keep | | | wool in pocket) | P | Cam roller slide | Oil every 5 hours | K | Valve levers | Fill with oil every 5 hours| | | (keep wool in pockets) | ----+----------------------+----------------------------+-----------