User Manual

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