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FIGURE 2 <br />ALLOWABLE OVERHUNG LOADS FOR V BELT DRIVES UNIVERSAL RAI®/URAI"-J UNITS <br />Belt Pull lbs = <br />252100 • Motor HP <br />Blower RPM - Sheave Diameter <br />C = Distance between drive bearing center line and <br />sheave center line (A+B) <br />Sheave Width <br />B = (1/8" + ) <br />2 <br />Shaft Load (lb.in) = Belt Pull • C <br />Frame <br />Size <br />Dimension <br />"A" <br />Max Allowable <br />Shaft Load (Ib -in.) <br />22,24 <br />0.61 <br />80 <br />32, 33, 36 <br />0.80 <br />300 <br />42 45 47 <br />1.02 <br />640 <br />53 56 59 <br />1.13 <br />1,110 <br />65 68 615 <br />1.36 <br />1,550 <br />76, 711, 718 <br />1.16 <br />2,300 <br />NOTE: Arc of sheave belt contact on the smaller sheave not to be less than 170° <br />Driver to be installed on the inlet side for vertical units, and on the drive shaft side <br />for horizontal units. <br />ALLOWABLE OVERHUNG LOADS FOR V -BELT DRIVES 400 - 600 RAM" UNITS <br />27500 • Motor HP <br />Belt Pull lbs = <br />Blower RPM • Sheave Diameter <br />Sheve VVidth <br />Shaft Load (lb.in) = Belt Pull - (A + 1/8" + ) <br />2 <br />NOTE: Arc of sheave belt contact on the smaller sheave not to be less than 170° <br />Driver to be installed on the inlet side for vertical units, and on the drive shaft side for <br />horizontal units. <br />For your nearest ROOTS Office, dial our Customer Service Hot Line 1 877 363 ROOTS (7668). 18 <br />Dimension "A" <br />Max Allowable <br />Frame <br />Standard <br />Bottom Drive or <br />Shaft Load <br />Size <br />Unit <br />Double Shaft Seal <br />(Ib -in.) <br />404,406 <br />1.90 <br />2.11 <br />3,200 <br />409, 412, 418 <br />1.90 <br />2.11 <br />3,200 <br />616,624 <br />2.11 <br />2.67 <br />7,975 <br />NOTE: Arc of sheave belt contact on the smaller sheave not to be less than 170° <br />Driver to be installed on the inlet side for vertical units, and on the drive shaft side for <br />horizontal units. <br />For your nearest ROOTS Office, dial our Customer Service Hot Line 1 877 363 ROOTS (7668). 18 <br />