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MANAGERS AND PROJECTIONISTS 689
INSTRUCTION NO. 33— REMOVING OIL CASING COVER. — To remove oil casing cover 674, P-4, follow Instructions No. 24 and 25. Next remove screws 793 (three of them), P-4, and tap lightly on the hub of the cover to break the shellac joint.
In placing this cover back, scrape the edges lightly, but be sure and get them perfectly clean. Then smear edge of the cover (not casing edge, but the cover edge only) with thick shellac and clamp the cover in place. It is better if the shellac dries a little before you put on the cover, but don't let it dry too much. CAUTION: DO NOT PUT ON TOO MUCH SHELLAC. If you do it will squeeze out into the interior of the oil casing and get between the pins and the cam, and may do serious injury to the intermittent movement. Instances have been known where an excess of shellac has broken the geneva pins.
On Power's mechanisms manufactured since the latter part of 1923 the intermittent casing cover has been made with a recess into which an oil seal packing ring or gasket has been placed. This gasket eliminates the use of shellac in sealing the intermittent casing. If, however, the gasket should be damaged when removing the cover a new gasket should always be inserted.
INSTRUCTION NO. 34— REMOVING CAMSHAFT AND
CAM.— First follow Instructions Nos. 21, 24, 25 and 33. Then loosen the two screws 743, P-2, in bushings 670 and 671, P-2 Then loosen the two set screws in the collar on shaft 675, P-2, just above arrow head, 670, P-2, move the collar over to the right, and, with a small fine file smooth off the burrs caused by the set screws. The shaft and cam may now be pulled up to the left. CAUTION: In replacing the shaft, do not forget to put collar on and tighten the two screws 743, P-2.
INSTRUCTION NO. 35— REMOVING INTERMITTENT SPROCKET, ITS SHAFT AND PIN CROSS AS A UNIT.—
To remove the intermittent sprocket, its shaft and the pin cross as a unit, first follow Instructions Nos. 19, 21, 24, 25, 33 and 34. Next loosen screws 743, P-2, and the entire unit, including the large bushing in which the shaft runs, may be pulled out through the oil well.
INSTRUCTION NO. 3fr— ALIGNING SPROCKETS.— It
is of the utmost importance that upper sprocket 617, P-2, intermittent sprocket 667, P-2, and lower sprocket 646, P-2, and aperture plate be all kept exactly in line. The alignment of intermittent sprocket, upper sprocket and aperture plate may be tested by placing a short strip of film (don't