Hobart 9OC24S Operation Manual page 300

HOBART
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EMOTOR GENERATOR DIVISION
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HOBART EIROTHERS COMPANY
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OPERATION, MAINTENANCE , AND OVERHAUL MAN UAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO. 5381A
(b) Inspect the generator shaft.
Make certain it is clean and the machine key
(6, Fig. 7) is in place.
(c) Before mounting the coupling assembly on the generator shaft, remove set
screws (A, Fig. 6) from the coupling. Make certain the hub bore and the
bushing are clean.
(d) Place bushing (D) in hub (C) and match the unthreaded half holes in
bushing with threaded half holes in the hub.
(e) Oil the threads and points of the two set screws (A) and thread them
loose ly in the holes just aligned.
(f) Insert a screwdriver blade in the bushing slot to open the bore enough to
al low easy mounting on the shaft.
(g) Mount the coupling assembly on the generator shaft. Install so that the
shaft extends from the bushing about l/8 inch, as a starting point (see
Fig. 5). Keep the dimension, arrived at in step (a) above, in mind when
locating the coupling on the shaft.
Remember that the coupling will be
"pulled" toward the end of the shaft when set screws are tightened.
(h) Remove the screwdriver from the bushing slot and tighten set screws (A,
Figure 6), to pull hub onto bushing.
(i) Tighten the set screws alternately and evenly until tight. Torque to 67
foot-pounds (see Fig. 17). Strike against the outer end of the bushing.
Use a wood block to protect the bushing. Screws can now be turned a
little more using the specified torque. Repeat until screws cannot be
tightened further.
(i) Hold a "straight-edge" across the outer end surfaces of two of the flexible
coupling, rubber bushings as illustrated in Fig. 18. Use a steel ruler to
measure the distance from the inner edge of the "straight-edge" to the
generator (1). This distance must be the same as the dimension measured
in step (a) above. A tolerance of plus or minus l/32 inch between
dimensions is al lowable.
If measurements are not the same, loosen the hub by following applicable
portions of instructions in Para. 3, B, (1) (a) and (b). Move the split,
bushing (D, Fig. 6) on the shaft as required to relocate the coupling,
inward or outward as dictated by measurement above.
(k) Repeat step (i) above. Re-check measurement as in step (i). Repeat as
required until the coupling assembly is properly positioned'.
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