Rogers KI Series, Installation, Operation And Maintenance Manual

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13.
2.5.2 Belt Alignment
Examples of poor belt alignment are shown in Figure 2.
Figure 2. V-Belt Alignment.
a. Drive and driven shafts are not in alignment.
b. Driven shaft has angular misalignment.
c. Sheave locations are not inline.
d. Correct location of sheaves, belts are inline and parallel.
2.5.3 V-Belt Inspection
Remove belt guard and inspect belt condition during the 6,000 hour service or whenever conditions
indicate there may be a problem.
Check sheave grooves for nicks, scratches and wear. Belts should be inspected for unusual wear or
cracks. Thoroughly inspect the bore of the sheave and surface of the bushing.
Any paint, dirt, metal chips, fluid or grease MUST be removed. It is important to note that sheave
condition and alignment are vital to V-belt life and performance. Sheaves should be carefully checked
whenever V-belts are replaced. Mount the sheaves close to the compressor and motor housing to reduce
strain on bearings from side-load.
2.6 D-Face Mounted Drive System (60 to 100 HP)
Once the motor is bolted into the compressor’s D-Face mount at the factory, alignment is insured.
However, the coupling halves should be loosened and retracted during start up to insure the air end
rotates freely and motor rotation can be checked.
Once motor rotation is verified, the coupling halves may be pushed together with the coupling element
sandwiched between them. Do not force the hubs together or leave a gap between the hubs and element.
Simple contact of the hubs with the element is sufficient.
Do not operate the compressor without the element. Tighten the set screws on the coupling hubs to
secure them and the key to the shaft. The motor feet and compressor are supported by flexible vibration
isolating mounts to minimize transmission of vibration energy into the assembly base.