General Pump KFZ Owner Manual - Manual (Page 17)

GENERAL PUMP
A member of the Interpump Group
KFZ SERIES
Page 17
fig. 11
c) Set belt tension according to the Manufacturer’s suggestions; an excessive value will abnormally stress the
bearing, reduce its duration and cause premature wear of the pulley. The tension value depends on different
variables as indicated in paragraph 9.12.
d) Belt length has a natural tolerance ≥ ± 0.75%; for this reason the 4 belts must be purchased in pairs
e) Follow the belt tension directions as indicated in fig. 9; for different needs, please contact the Customer
Service Department.
f) Carefully align driver pulley and driven pulley races.
9.12 Definition of belt static tension values
Static tension depends on:
a) The center distance between the two pulleys (belt length).
b) The load due to the belt’s static tension.
c) The number of belts.
d) The angle of wrap of the smallest pulley.
e) Average speed.
f) Etc.
For belts with an XPB profile, the diagram in fig. 12 allows to obtain the values of the static tension that must be applied
vs. the center distance between pulleys.