Fig. 86.—Proper Use of a Grease Cup
[Figure 85] is an oil cup, which is used to feed an individual bearing. It is a glass cup holding oil with an opening at the bottom into which fits a needle valve. When the engine is at rest, the needle valve handle at the top is turned down, which allows a spring to close the needle valve; on starting the engine the needle valve is raised, and the oil flows out by gravity. The dripping oil may be seen through a sight glass at the bottom.
In the force feed and oiler systems the oil feeds only when the engine is running, but with an oil cup the oil feeds all of the time that the needle valve is raised. Care must therefore be taken to turn on the oil cup when starting the engine, and to turn it off when the engine is stopped.
Change speed gears and differentials are usually enclosed in oil-tight housings that contain a supply of oil or grease. The only attention that is required is to see that they have the necessary amount, and that the lubricant is of the right kind.
Fig. 87.—“Titan” 10-20 Oiling Diagram
Fig. 88.—“International” Oiling Diagram
The bearings of wheels and of many other parts of a tractor are lubricated with grease fed by grease cups; a grease cup has a cover that, when screwed down, forces the grease out of a hole in the bottom of the cup. In using a grease cup it is not sufficient simply to give the cover a turn or two; the cover should be screwed down enough to force an ample supply of grease to the bearing. This is illustrated in [Figure 86].