General Pump KEZ Owner Manual v.2 - Manual (Page 12)

GENERAL PUMP
A member of the Interpump Group
KEZ SERIES
Page 12
9.11 Transmission Definition (continued)
c) Set belt tension according to the Manufacturer’s rec
ommendations; 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 para
graph 9.12.
d) Belt length has a natural tolerance ≥0.75%; for this
reason the belts must be purchased in sets.
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.
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.
The chart in fig. 11 shows the correct flexion of XPB belts
according to their length, given a load of 75 N.
fig. 11
Conclusion: given a center distance (Lf) of 400 mm (15.75
inches) by applying a Fe load of 75 N at the middle of the
length, the belt flexion “te” will result at about 8.4 mm (.33
inch).
Note: If not differently indicated by the belt manufacturer,
the inspection of the correct tension value, and the related
tension adjustment if needed, is to be carried out after at
least 30 minutes of operation in order to obtain belt set-
tling. The best efficiency and maximum duration is
obtained with a correct tension value.
If required, or during normal maintenance, never replace a
single belt, but the entire set.
10.1 Preliminary Inspections
Before Start-up Be sure that:
The suction line is connected and up to pres-
sure (see paragraphs 9.4-9.5-9.6) the pump
must never run dry.
1. The suction line must be perfectly airtight.
2. All the On-Off valves between the pump and
the feeding source are completely open. The
delivery line must discharge freely in order to
allow the air in the pump to be expulsed easi
ly, thus facilitating pump priming.
3. All suction/delivery connections and fittings
must be correctly tightened.
4. Coupling tolerances on the pump/transmis-
sion axis (half-joint misalignment, Cardan
inclination, belt tightening, etc.) must remain
within the limits indicated by the transmission
Manufacturer.
5. The oil level in the pump must be verified
using the correct dipsticks (position 1, fig 13),
and especially using the oil sight glass (posi-
tion 2, fig. 13).
fig. 13
Ref 300665 Rev.C
07-13