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PUMP COUPLINGS
VALVES - 14003_98

Aviation Boatswains Mate F - Aviation theories and other practices
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Figure 4-12.—Falk Type-F Steelflex coupling. coupling is normally gained from a gear, a spring arrangement, or a rubber insert between the coupling halves. Depending on the type of coupling, lubrication may or may not be required. Falk Type-F Steelflex Coupling This coupling (fig. 4-12) is a flexible, self- aligning, gridmember coupling. The two hubs are symmetrical, but may have different bores or keyways. One hub is keyed to the motor shaft, and the other hub is keyed to the pump shaft and secured axially by set screws. A flexible gridmember engages the teeth in the hubs to transmit power. A gasket and two seal rings are fitted to the covers to prevent grease leakage. The parts are enclosed in two cover halves that are bolted together. When it is necessary to disconnect the coupling, remove the nuts and bolts, separate and draw back the cover halves, and remove the gridmember. To remove the gridmember, a round rod or screwdriver that conveniently fits into the open loop ends of the gridmember is required. Begin at the open end of the gridmember section and insert the rod or screwdriver into the loop ends. Use the teeth next to each loop as a fulcrum and pry the gridmember out radially in even, gradual stages. Proceed alternately from side to side lifting the gridmember about halfway out until the end of the gridmember is reached. Using the same procedure again, lift the gridmember until the teeth are cleared. This separates the coupling hubs. Before reassembly, clean all parts thoroughly and check the coupling alignment in accordance with the pump’s technical manual. After the coupling is aligned, carefully insert the gasket between the hubs and hang it on either hub. Do not damage the gasket. Next, force as much lubricant as possible into the space between the hubs and grid-member grooves. Insert the gridmembers. To accomplish this with a minimum amount of spreading, start the gridmember at either end and tap the rungs only part way into the grooves. After all the rungs are partially in their respective grooves, tap the gridmember all the way into place. The hub grooves on each hub are uniformly spaced and do not require matching. Again pack lubricant in the spaces between and around the gridmember, then wipe off the excess flush with the top of the gridmember. Lightly oil the hubs to ease the sliding of the covers onto the hubs. Mount the covers so the lubrication fittings are 180 degrees apart. Insert a screwdriver under the seal ring for venting purposes and then tighten the cover bolts. Remove the screw-driver, check the seal rings for proper seating, and align the cover to prevent wobble. 4-17







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