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8-1
SHAFT COUPLING
Figure 8- 1 – COUPLING COMPONENTS
Rotating machinery can cause personal injury or death. Turn the unit completely off,
open the main disconnect, lockout and tagout before servicing the coupling.
SHAFT COUPLING – Main motors drive their companion compressors by means of curved jaw-type
couplings. Each coupling hub is fixed to the shaft with a setscrew and key combinations. The power is
transmitted through a meshing, single, dry, vibrations damping element – see Figure 8-1, for details of the
main components.
The close-coupled arrangement of motor and compressor, through machined cast housing, provides
automatic alignment of shafts and coupling. The coupling assembly requires no lubrication.
Coupling Element (Rotex size 65) Inspection and Replacement:
1. Disconnect, lockout and tagout power supply to the compressor package.
2. Remove fasteners securing coupling guard to access opening on compressor-motor housing and
remove guard.
3. Depending on the bore-to-shaft fits (e.g., clearance or interference) on either of the coupling hubs
proceeds as directed. For hub-to-shaft clearance fit hubs:
· Loosen setscrews fastening hubs to shafts and slide hubs away from each other to allow
removal of coupling element. Note that if the hubs do not slide on the shafts after this step, they
should be considered interference fitted, thus proceed directly to Step 4, for further removal
instructions.
· Inspect coupling element for signs of wear and tear such as indentations, cracks, deformation,
extrusions, etc. Replace, if necessary.
· After engaging each hub on the matching recesses of the coupling element, check that the gap
between the hub flats (see dimension “E” on Figure 8-2) is within 1.38/1.50 in (35/38 mm).
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