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UNPACKING THE V-BELT SYSTEM
To protect the belts from shock and strain during transportation, the free-swinging side of the motor frame
is locked in place by means of a carrier bracket assembly. Proceed to prepare the belt system for
operation as follows, refer to Figures 8-1 & 8-2 for component description:
1. Unlatch and remove the door panel opposite to the main cooling fan panel to gain access to the
v-belt system.
2. Lift motor from carrier bracket (1) by loosening jam-nut (2) and screwing in adjusting bolt (6).
3. Loosen and remove fastening screws (3) and (4) as well as carrier bracket (1). Keep this
hardware for future use, such as relocating compressor package.
4. Check alignment of the sheave set and make sure that v-belts are properly seated in sheave
grooves.
5. Screw out adjusting bolt (6) and secure with jam-nut (2) to allow motor weight to rest on v-belts.
SHEAVE SET ALIGNMENT
1. Use a straight edge for alignment checks.
2. Check parallel alignment. It should be simple to control by moving one of the sheave/bushing
pairs along the shaft to match the other.
3. Check angular alignment. The misalignment A = ArcTan * ((X2-X1)/D), where calculated A is in
degrees and measured X1, X2 and D are in inches or mm.
4. The allowable total misalignment is 0.5 degrees for best belt longevity. As reference, 0.5 degrees
represents a gap (e.g., X1-X2) of 0.05" (1.33mm) over a 6" diameter sheave.
Check sheave misalignment prior to start compressor operation. Failure to do
so may shorten the operational live of the belts.
Figure 8-3 Measuring Angular Misalignment
13-25-629 v03
Page 54
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