Gardner Denver PUREAIR EWC99C, Руководство по эксплуатации и обслуживанию

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13-11-607 Page 41
SECTION 7
BELT DRIVE
Proper drive belt tension and alignment are provided at the factory; however, good practice dictates
checking the drive alignment and tension after shipment and before initial start-up.
Sheaves should align straight across the front with a straight edge. The best tension is just enough
tension to keep belts from “squealing” on start-up.
CAUTION
Excessive belt tension can damage the equipment. Tension the belts as shown
in Figure 7-1, page 42.
Belts can be changed when necessary by the following instructions: Disconnect, tag and lockout power
to the starter, remove the belt guard, and loosen, but do not remove, the four motor foot nuts.
Next, use the adjusting screws in the motor base to loosen belt tension. Remove the belts, and replace
with new belts. Check for correct belt tension and sheave alignment, tighten the motor foots bolts, and
re-attach the wire guard.
CHECKING BELT TENSION - Using a spring scale, apply a perpendicular force to each belt at the
midpoint of the span and measure the deflection. Correct deflection force and deflection are shown in
Figure 7-1, page 42. To tighten belts, merely increase the center distance between the sheaves.
NOTICE
When a new set of belts is installed on a drive the initial deflection force should
be 1/3 times greater than shown in Figure 7-1, page 42. Recheck tension
frequently during the first 24 hours of operation.