North American Clutch & Driveline
Rockford, Illinois
Phone: (800) 383-9204
(815) 282-7960
Fax (815) 282-9160
www.naclutch.com
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AllOWABle SIDe lOADS
Figure 20. Allowable Side Pull and Formula to Determine Applied Load (See alternate illustrations
for Spread Bearing Models)
Formula values:
L = actual applied load (Lbs.)
N = shaft speed (RPM)
D = pitch diameter (in.) at sheave, etc.
F = load factor
−
for chain or gear drive
−
2.5 for all V belts
−
1.5 for timing belts
−
3.5 for flat belts
LF = 2.1 for reciprocating compressors and other severe shock drivers and 1.8 for large
inertia type drive (crushers, chippers, planers)
A support plate must be attached at the rear of the PTO if it is subjected to side load operation
of the shaft. See the NACD Support Plate Specifications in the Description and Specifications
section of this manual.