Owner Manual

9.9 V-belt Transmission
The pump may be driven by a v-belt system. For this
pump model, we suggest to use 4 XPB belts (16.5 x 13
cogged); only for long durations, use the XPC profile; both
the characteristics and the power transmission capacity of
each belt can be verified on the diagram in fig. 7, in func-
tion of the number of rotations normally declared by the
Manufacturer. Minimum diameter of the driven pulley (on
the pump shaft): ≥ 250 mm. The radial load on the shaft
must not be greater than 7500 N (value required for the
fefinition of the layout). The transmission is considered
adequate if this load is applied at a maximum distance of
a=40 mm form the shaft shoulder (PTO) as indicated in
fig. 10
For sizing that differs from that indicated above,
please contact our Customer Service
Department.
9.10 Transmission Definition
To avoid abnormal radial loads on the shaft an its related
bearing, please comply with the following indications:
a) Use pulleys for v-belts with race dimensions
prescribed/recommended by the belt
Manufacturer. Should no indications be supplied,
please see fig. 8 and the table in fig. 9.
fig. 8
Page 11
GENERAL PUMP
A member of the Interpump Group
KFM SERIES
Dimensions (in mm)
b) Use high efficiency belts - for example XPB
instead of SPB; this will allow to use a lower
number of belts to transmit the same power, and
consequently a minor distance of the resultant
from the shaft shoulder (PTO) “a” in fig. 10.
fig. 10
c) Set belt tension according to the
Manufacturer’s prescriptions: 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 9.11.
d) Belt length has a natural tolerance ≥ ± 0.75%;
for this reason the four belts must be purchased
in pairs.
e) Follow the belt tension direction as indicated in
fig. 9; for different needs, please contact the
Customer Service Department.
f) Carefully align driver pulley and driven pulley
races.